Analogue and digital hybrid double-loop control stabilized current supply device

Abstract

The invention discloses an analogue and digital hybrid double-loop control stabilized current supply device. The device comprises an adjustable alternating current to direct current (AC-DC) switch stabilized voltage supply, a load, a current sensor, a controller and an auxiliary power supply, wherein a cable at the output end of the AC-DC switch stabilized voltage supply (1) passes through the current sensor (3) and is connected with the load (2); the output end of the current sensor is connected with the input end of an analogue to digital (AD) converter of the controller (4); and the output end of a digital to analogue (DA) converter of the controller (4) is connected with the voltage control end of the adjustable AC-DC switch stabilized voltage supply. A high-speed analogue voltage loop serving as an inner loop is combined with a low-speed digital feedback current loop serving as an outer loop so as to fulfill the aims of achieving indexes of high dynamic performance and high static stability, reducing the technical complexity of a digital control card, lowering cost, making a power supply accordant with the compatibility standard of harmonic waves and electromagnetism, enhancing reliability and shortening the development time of the controller and an entire machine and achieve the advantage of giving consideration to both an analogue power supply and a digitized power supply.

Description

technical field [0001] The invention belongs to the field of power supply technology, and in particular relates to the technology of a particle accelerator magnet steady current power supply. Background technique [0002] In several major accelerator devices in China, digital power supplies are gradually being used to replace analog power supplies. For example, the high-power steady-current power supply of Shanghai Light Source uses a digital controller developed by Swiss PSI, and the low-power power supply uses a digital controller developed in cooperation with domestic companies. The controller is composed of two control cards, DSP and ADC. Because it is a purely digital feedback loop, the technical requirements for the digital card are very high, such as AD sampling speed and accuracy, PWM generator resolution, digital PI adjustment period, etc. , so the digital card is expensive; in addition, the main circuit of the power supply is designed according to the steady curre...

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Problems solved by technology

[0003] The purpose of the present invention is to overcome the disadvantages of existing digital power supply control cards, such as high acquisition speed requirements, high-resolution PWM generator, high price, cumbersome interface, slow development cycle, special customization of power converters, and lack of technical certification, etc., and provide a An analog and digital hybrid double-loop control steady-current power supply device that can utilize existing mature devices, has simple structure, low cost, and good reliability

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