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本开关电源的振荡器作为电压输出检测器以控制串联功率开关。电路特点是不需电感器件,功耗很低。原理如附图。7413为双四输入与非门触发器(施密特触发器)。与非门(1)和D1、 C1组成振荡器。最初,Trl截止,C1充电直到施密特触发器被触发。7413(Ⅰ)
The switching power supply oscillator as a voltage output detector to control the series power switch. The circuit is characterized by no inductive components, low power consumption. The principle is shown in the attached figure. The 7413 is a dual four-input NAND gate trigger (Schmitt Trigger). NAND gate (1) and D1, C1 form the oscillator. Initially, Trl ends, and C1 charges until the Schmitt trigger is triggered. 7413 (Ⅰ)