Low cost high reliability Yi herbal medicine production isolated form switch power supply

Abstract

The invention discloses a low cost high reliability Yi herbal medicine production isolated form switch power supply; a rectification filter circuit is coupled to a power supply end U1 and a control circuit; a remote control switch circuit is coupled to the control circuit so as to control the switch; a control circuit transformer Ta2 coil L1 is connected in parallel with a cascading capacitor C4 and a resistor R3, and coupled to the rectification filter circuit and a triode T4 collector electrode; a triode T4 base electrode is coupled to the rectification filter circuit through series resistors R2 and R4, and an emitter electrode is grounded; a coil L3 is connected with a power supply output end U0; a self excitation concussion positive feedback unit is coupled with a starting unit, and can improve the power supply output power through the transformer Ta2 and a circuit; a pulse width modulation unit is coupled to the starting unit through a triode T2, a triode T3, a photoelectric triode OC and a circuit, thus stabilizing the power supply output; a protection unit is coupled to the starting unit, the positive feedback unit and the pulse width modulation unit through circuits, thus forming protection; a voltage stabilization unit outputs stable voltage to the power supply through a triode T5 and a circuit.

Description

technical field [0001] The invention belongs to the technical field of switching power supplies, and in particular relates to a low-cost, high-reliability isolated switching power supply with simple structure, low cost and high reliability. Background technique [0002] With the rapid development of electronic technology, the application fields of electronic systems are becoming more and more extensive, and there are more and more types of electronic equipment. The relationship between electronic equipment and people's work and life is becoming increasingly close. The circuits in modern electronic equipment use a large number of semiconductor devices, and these semiconductors need DC power supply of several volts to tens of volts in order to obtain the energy necessary for normal operation. Some of these DC power sources are chemical power sources, such as dry cells and storage batteries, but these cannot sustain power supply. The DC power supply method of most electronic...

AI Technical Summary

Problems solved by technology

However, the study found that the cost of using an operational amplifier circuit as an isolated switching power supply is high, and it is not suitable for medium and small power supplies produced by Yiyao; while using a traditional triode control circuit as a signal amplifier is relatively low in cost, but due to the lack of necessary protection and control mechanism, it is also difficult to meet the requirements of switching power supply control accuracy of modern Yi medicine production equipment

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