Numerical-control adjustable DC power supply

Abstract

A numerical-control adjustable DC power supply belongs to the field of electricity and concretely relates to a numerical-control adjustable DC power supply requiring low cost and being easy to regulate. The numerical-control adjustable DC power supply comprises a controller, a voltage controller, a protection device, a power supply switch, a current control circuit, an amplifier, a PMM generation circuit and a buck-mode switch power supply. The structural key points are that an output of the controller is connected with input ends of the voltage control circuit, the protection device, the power supply switch, the current control circuit and the amplifier; output ends of the voltage control circuit, the protection device, the power supply switch, the current control circuit and the amplifier are connected with an input end of the PMM generation circuit; and an output end of the PMM generation circuit is connected with an input end of the buck-mode switch power supply.

Description

technical field [0001] The invention belongs to the field of electricity, and in particular relates to a digitally controlled adjustable DC power supply. Background technique [0002] Today's adjustable switching power supply usually uses a dedicated chip, which has the advantages of short development time and strong controllability; at the same time, it also has the disadvantages of function being limited by the chip. The controllable switching power supply scheme proposed in this paper changes the resistance value of the digital potentiometer through software control to change the feedback voltage of the flyback switching power supply, thereby changing the output voltage, making the adjustment of the output voltage range of the power supply extremely convenient. The output voltage of the switching power supply can be controlled by buttons, USB bus, etc., and the output voltage can be stored in power-off mode, and the control mode is also easy to expand (such as expanding t...

AI Technical Summary

Problems solved by technology

Although the digitally controlled adjustable power supply using the linear power supply scheme has small output ripple and relatively low cost, its characteristics such as limited output current, low efficiency, large heat generation, large volume, and heavy weight determine that the voltage and current output amplitude requirements are relatively high. It is difficult to meet the actual needs in occasions such as high and portability requirements

The CNC adjustable power supply adopting the switching power supply scheme has the characteristics of large output current and voltage range, easy to carry, etc., but its cost is relatively high, and it is not easy to debug

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