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2.稳压、待机与保护电路该机芯的稳压、待机及保护控制电路在开关电源的次级,如图5所示。(l)稳压控制电路稳压控制电路主要由Q883、D862组成,Q883内含取样、基准、误差放大电路。如果主输出电压高于115V,则经Q883取样及误差放大后,Q883的输出使光电管D862的①、②脚内接发光二极管的电流增大,于是D862的④、③脚内接光敏三极管的电流也增大,即从STR—Z2152的⑤脚流出来的电流增大,所以输出主电压将降回到+115V标准值。
2. Regulators, standby and protection circuit The movement of the regulator, standby and protection of the control circuit in the secondary power supply, as shown in Figure 5. (l) Regulator Control Circuit Regulator control circuit mainly consists of Q883, D862, Q883 contains sampling, reference, error amplifier circuit. If the main output voltage is higher than 115V, Q883 sampling and error amplification, Q883’s output so that the photodiode D862 ①, ② pin connected to the LED current increases, so D862 ④, ③ foot phototransistor Current also increases, that is, from the STR-Z2152 ⑤ feet out of the current increases, so the output voltage will drop back to the standard value of +115 V.