Multi-magnetic circuit low voltage high current digital AC constant current source

Abstract

The invention relates to a multi-magnetic-circuit, low-voltage and large-current digital AC constant current source, which comprises a current transformer, a micro-controller, H-bridge drive circuit modules, full-bridge circuits and a multi-magnetic-circuit transformer. The current transformer is used for acquiring a current signal outputted by a load side and then sending the acquired current signal to the micro-controller. The micro-controller is used for outputting control signals in one to one correspondence with the H-bridge drive circuit modules according to the control signal. The multi-magnetic-circuit transformer is formed by a plurality of current-rising transformers. The secondary winding of the multi-magnetic-circuit transformer is connected with the load side and is formed through the serial connection of the secondary coils of all the current-rising transformers. The primary winding of the multi-magnetic-circuit transformer is formed by the mutually independent secondary coils of all the current-rising transformers. The current-rising transformers, the full-bridge circuit and the H-bridge drive circuit modules are in one-to-one correspondence. The full-bridge circuits are connected with the primary coils of the current-rising transformers. The full-bridge circuits are connected with a current access end. The H-bridge drive circuit modules controls the on / off states of the full-bridge circuits according to one corresponding control signal. The multi-magnetic-circuit, low-voltage and large-current digital AC constant current source is stable in operation, strong in interference resistance, low in loss and low in cost.

Description

technical field [0001] The invention relates to a power supply device, specifically a low-voltage high-current digital AC constant current source. Background technique [0002] In the low-voltage and high-current field, a single inverter solution cannot meet the power output requirements, and it is often necessary to use multiple inverters in parallel to increase their output power. This kind of inverter parallel expansion scheme is simple to realize, and at the same time, low-power switching devices can be selected, which reduces the production cost. The output of the total current of the transformer, so the existence of circulating current increases the loss of the line and reduces the efficiency of the system output; at the same time, the circulating current will also cause the problem of uneven current, which will make the current stress borne by the power device IGBT tube unbalanced , affecting its service life and reducing the reliability of the parallel system. Con...

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Problems solved by technology

[0002] In the low-voltage and high-current field, a single inverter solution cannot meet the power output requirements, and it is often necessary to use multiple inverters in parallel to increase its output power

This kind of inverter parallel expansion scheme is simple to realize, and at the same time, low-power switching devices can be selected, which reduces the production cost. The output of the total current of the transformer, so the existence of circulating current increases the loss of the line and reduces the efficiency of the system output; at the same time, the circulating current will also cause the problem of uneven current, which will make the current stress borne by the power device IGBT tube unbalanced , affecting its service life and reducing the reliability of the parallel system

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