A constant power wide range digital program-controlled power supply and its control method

Abstract

The invention discloses a constant power wide-range digital program-controlled power supply and a control method. A two-stage EMI common-mode filter unit performs two-stage EMI common-mode filter on the input alternating current; The DC voltage and the feedback current information control the Boost conversion unit to perform Boost rectification conversion on the DC voltage output by the full-bridge rectification unit, and simultaneously detect the output voltage after Boost rectification conversion; the first digital signal processing control unit controls the Boost output voltage and setting The rectified output target voltage is compared, and the compared difference is used as the input error command of the output voltage closed-loop; the voltage closed-loop PID control calculation is performed on the input error command, and the output target voltage control of the Boost conversion unit is realized. In order to meet the quality and quality requirements of the program-controlled power supply in actual use.

Description

technical field [0001] The invention belongs to the field of power supplies, in particular to a constant-power wide-range digital program-controlled power supply and a control method. Background technique [0002] As a power supply that can dynamically adjust the output voltage and current under the control of the host computer, the program-controlled power supply is widely used in laboratories and other power supplies, and can also be used as an industrial field power supply. However, the current program-controlled power supply generally adopts a two-stage topology structure, the front stage rectifies and stabilizes the voltage, and the latter stage directly converts DC / DC output. However, the power of the program-controlled power supply is constant, and the maximum output current is determined by the rated power and the maximum output power supply voltage. Therefore, when the program-controlled output When the power supply voltage is lower than the maximum output power sup...

AI Technical Summary

Problems solved by technology

However, the current program-controlled power supply generally adopts a two-stage topology structure, the front stage rectifies and stabilizes the voltage, and the latter stage directly converts DC / DC output. However, the power of the program-controlled power supply is constant, and the maximum output current is determined by the rated power and the maximum output power supply voltage. Therefore, when the program-controlled output When the power supply voltage is lower than the maximum output power supply voltage, its power cannot achieve full power, that is, the program-controlled power supply cannot achieve constant power output, which restricts the output power range of the program-controlled power supply at different output voltages.

[0003] In order to achieve constant power output, another program-controlled power supply designs the transformer in DC / DC conversion according to constant power, low voltage and high current. To meet the high voltage and low voltage wide ranges at the same time, the actual transformer power needs to be several times the rated power. Design, increasing the size of the transformer also increases the difficulty of transformer design, thus affecting the overall quality of the program-controlled power supply

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