Wide-range high-precision low-noise automatic range direct current power source

Abstract

The invention provides a wide-range high-precision low-noise automatic range direct current power source, which comprises a preceding stage power source and a central processing unit (CPU) control circuit, and also comprises a step-down circuit. The step-down circuit comprises a metal oxide semiconductor (MOS) tube Q1, a diode D1, an energy storage inductor L1, a load resistor R4, a current sampling resistor R5, a capacitor C3, an output capacitor C2, a driving circuit and a pulse width modulation (PWM) circuit, so that the wide high-voltage or high-current output capacity of the high-voltage / low-current or the high-current / low-voltage can be realized under power source output power at certain power in a power source cabinet in a certain volume, and high-speed and adjustable dropping characteristic of the output voltage or the output current can be achieved.

Description

technical field [0001] The invention relates to a direct current power supply product, in particular to a wide range, high precision and low noise automatic range direct current power supply. Background technique [0002] In the electronic laboratory, due to the need to test a variety of different products, the power supply usually selected needs to have a certain margin, because it is usually difficult to predict the various test requirements that may appear in the future. Therefore, the current situation in the market is that many laboratories must prepare multiple types of power supplies to meet testing requirements, because conventional DC power supplies include linear power supplies and switching power supplies, and the isolation transformer of linear power supplies and the high-frequency transformer of switching power supplies play an electrical role. Due to the dual functions of isolation and power transmission, its power output capability is proportional to its magne...

AI Technical Summary

Problems solved by technology

[0002] In the electronic laboratory, due to the need to test a variety of different products, the power supply usually selected needs to have a certain margin, because it is usually difficult to predict the various test requirements that may appear in the future

Therefore, the current situation in the market is that many laboratories must prepare multiple types of power supplies to meet testing requirements, because conventional DC power supplies include linear power supplies and switching power supplies, and the isolation transformer of linear power supplies and the high-frequency transformer of switching power supplies play an electrical role. Due to the dual functions of isolation and power transmission, its power output capability is proportional to its magnetic core cross-sectional area and the area of ​​the winding window. For a certain transformer, the maximum power transferred is limited by the effective cross-sectional area of ​​the magnetic core and the winding window area. The area of ​​the line window, this maximum power limits the product of its output voltage and current, if a larger output current is required under a certain output voltage, a larger transformer is required, and the replacement of a larger transformer requires higher costs, and A larger chassis is required to place it, which takes up laboratory space, wastes testing costs, and causes troubles in wiring, because it means that for engineers, every time a product is tested, a power supply needs to be replaced

Generally speaking, the defects of the narrow voltage / current range range of this kind of power supply products on the market in a certain power range cause customers to need to purchase multiple power supplies with different powers to meet the test requirements, resulting in increased cost of purchasing power supplies and waste of resources , and it is very inconvenient to frequently replace the power supply

Images