Multi-path parallel ultra-high-speed low-voltage high-current pulse type constant current source

Abstract

The invention discloses a multi-path parallel ultra-high-speed low-voltage high-current pulse type constant current source, relates to the technical field of power supplies, and aims to solve the problem of how to design a multi-path parallel high-speed high-current pulse type constant current source with the output current reaching a kiloampere level and the pulse rising speed at a microsecond level. Through independent control of multi-path output, a DSP controller sends out SPI signals, sends out the same given pulse signals in a unified mode and inputs the same given pulse signals to a pulse signal generation source circuit, and current equalization of a constant current source is guaranteed. A plurality of Hall current sensors of a main circuit respectively sample output currents of the emitters of a plurality of IGBT as feedback signals and input the feedback signals to the pulse constant current source control circuit for comparison with the given signals in order to control thedriving voltage, so that the plurality of IGBTs in the main circuit all work in a linear region, the output current and the pulse width are controlled, and constant-current output is achieved. The control signal EN uniformly controls the on and off of the pulse signal through the same I / O port, thereby guaranteeing the consistency of the rising edge time sequence of the control signal, achievingthe parallel connection of a plurality of IGBTs, and enabling the output current to reach a kiloampere level.

Description

technical field [0001] The invention relates to the technical field of power supplies, in particular to a multi-channel parallel ultra-high-speed low-voltage high-current pulse type constant current source. Background technique [0002] A constant current source refers to a constant current source that can output current that does not change with changes in its own resistance and external voltage fluctuations. Pulse constant current sources are used in semiconductor testing, laser diodes, superconductors, and other tests. At present, the current of the pulse type constant current source commonly found in the market is not high, and the pulse rise time is relatively slow. With the development and progress of science and technology, there are many models in the field similar to semiconductors, and the current is as high as several thousand A. For the pulse type The constant current source puts forward very high requirements, so it is of high frontier and importance to study a ...

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Problems solved by technology

[0009] Although the above patent application can generate constant current pulses with corresponding pulse width and amplitude according to different needs, it can be applied to loads such as resistors and LEDs. It has simple structure, stable function, safety and reliability, and has a faster rising edge (tens of microseconds). , larger current (hundreds of amps), etc., but its output current only reaches the level of 100 amps, and in the literature of the published constant current source, there is no multi-channel parallel connection, the current amplitude reaches the thousand amps level, and the rising A pulsed constant current source whose time reaches microsecond level

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