Constant-power wide-range digital programmable power supply and control method thereof

Abstract

The invention discloses a constant-power wide-range digital programmable power supply and a control method thereof. A two-stage EMI common-mode filtering unit carries out two-stage EMI common-mode filtering on an input alternating current; a first digital signal processing control unit collects a direct voltage output by a full-bridge rectification unit and feedback current information, controls aBoost conversion unit to carry out Boost rectification conversion on the direct current voltage output by the full-bridge rectification unit, and detects the output voltage after Boost rectificationconversion at the same time. The first digital signal processing control unit compares the Boost output voltage with a set rectified output target voltage, and takes a compared difference value as aninput error instruction of an output voltage closed loop, performs voltage closed-loop PID control calculation on the input error instruction to achieve output target voltage control of the Boost conversion unit. Therefore, the quality requirement of the programmable power supply in actual use is met.

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...

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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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