A wide-voltage or regulated power supply circuit with self-feedback and self-protection function

Abstract

The invention relates to a wide-voltage or voltage-stabilization power supply circuit having self-feedback and self-protection functions. The wide-voltage or voltage-stabilization power supply circuit comprises an input protection circuit, a pulse width modulation (PWM) signal control and energy generation circuit, a convergence circuit and an output feedback on-off control circuit. With the adoption of the technical scheme, the wide-voltage or voltage-stabilization power supply circuit is wide in power supply input adaptability range, and for the embodiment, normal working of 10-150V can be met; a resistor-capacitor, a diode and an N-channel metal oxide semiconductor (NMOS) tube are reasonably selected by the control circuit and the energy conversion circuit, the withstand voltage of a driving circuit can be remarkably improved, so that high-voltage range application can be achieved; the wide-voltage or voltage-stabilization power supply circuit is simple in structural mode and high in driving capability, and high-efficiency and large-current power output can be achieved by reasonably selecting an inductor and a capacitance network; the output feedback control circuit designed by the invention fully considers isolation protection, overpressure protection and under-pressure protection, and the application reliability of the system is greatly improved; and meanwhile, a self-recovery fuse and a transient voltage suppressor (TVS) are additionally arranged for input and output, and the reliability is improved.

Description

technical field [0001] The invention relates to a wide-voltage or voltage-stabilized power supply circuit with self-feedback and self-protection functions, which has the characteristics of wide power supply input range, strong output current, and simple circuit realization, and can be widely used in high-voltage DC applications. Background technique [0002] As a key component of all electrical equipment in electronic, electric power, communication and other systems, DC power supply provides secondary power for the internal circuit of the equipment, and ensures the normal operation of each equipment when the quality of the input primary power is poor. [0003] At present, the DC power supply for high-voltage applications mostly adopts the form of linear voltage stabilization, which is realized by multi-stage cascading of triodes, power resistors, and linear DC voltage stabilization power supplies. figure 1 It is a typical application circuit. VIN is a high-voltage input pow...

AI Technical Summary

Problems solved by technology

The principle of this circuit is relatively simple, but there are many disadvantages

[0004] 1. The voltage difference drop and current amplification are realized through power resistors and triodes, the device generates serious heat, the power conversion efficiency is low, and the output drive current is weak

[0005] 2. Using this circuit for multi-stage cascading, it is difficult to guarantee the low-voltage turn-on characteristics, and the power input range is narrow

However, switching power supplies are often subject to the withstand voltage limit of the power chip itself, and are mostly used in occasions below 100V

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