Positive and negative voltage output power module with voltage stabilizing function

Abstract

The technical purpose of the invention is to provide a positive and negative voltage output power module with the voltage stabilizing function. The module includes an input voltage divider circuit, an operation amplifying voltage stabilizing circuit and a positive and negative voltage control output circuit. A power supply Vin achieves the voltage stabilizing function through a resistor and is connected with the operational amplifier non-inverting input terminal through symmetrical series-connection resistor voltage divider circuits, according to the working characteristics of a double-operation amplifier LM358, voltage-stabilizing amplifying is conducted, the double-power-supply working environment is converted through a single supply power, and capacitor filtering of the non-inverting input terminal achieves symmetrical bipolar positive and negative voltages. On the premise that the voltage is divided into two groups of symmetrical positive and negative voltages, the voltage stabilizing accuracy is ensured as much as possible. Meanwhile, the module is simple in system structure and low in cost, positive and negative double voltage output is input to a direct-current power supply single terminal, and the problem that most applications need a device using positive and negative power supplies for supply power is solved.

Description

technical field [0001] The invention relates to the field of a power supply, in particular to the field of a positive and negative voltage output power supply circuit with a voltage stabilizing function. Background technique [0002] Positive and negative output power modules are widely used. At present, the positive and negative power supply adopts single-ended input and double-ended output. The output ripple voltage is high and the interference is large. It cannot be applied to equipment that is sensitive to ripple interference, and the volume is relatively large and the output efficiency is low. , Larger power consumption. [0003] Operational amplifiers are widely used in our lives, and have strong common-mode rejection capability, high gain, and low input impedance. Therefore, using it as an amplification link can greatly improve various technical indicators of the regulated power supply. Through the improvement of the circuit, a single power supply operational amplifi...

AI Technical Summary

Problems solved by technology

[0002] Positive and negative output power modules are widely used. At present, the positive and negative power supply adopts single-ended input and double-ended output. The output ripple voltage is high and the interference is large. It cannot be applied to equipment that is sensitive to ripple interference, and the volume is relatively large and the output efficiency is low. , higher power consumption

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