Current-limiting control circuit of laser load distributor for space

Abstract

The invention discloses a current-limiting control circuit of a laser load distributor for space. The circuit comprises a current loop PI, a base resistor, a protective resistor, a triode, a collectorresistor, a soft start capacitor and a PWM control chip; the output end of the current loop PI is connected with the base electrode of the triode through the base resistor; one end of the collector resistor is connected with the collector of the triode, and the other end is connected with the soft start pin of the PWM control chip; the emitter of the triode is grounded; the protective resistor isconnected in parallel with the base and the emitter of the triode; one end of the soft start capacitor is connected with a soft start pin of the PWM control chip, and the other end is grounded; in the current-limiting control stage, the PWM control chip is in a full-duty-ratio output state, the triode is in a deep saturation state, the voltage of a soft start pin of the PWM control chip is controlled by controlling the turn-on time of the triode, and then the maximum output duty ratio of the PWM control chip is controlled to achieve current-limiting output. According to the invention, the current-limiting control of the satellite laser load distributor is realized.

Description

technical field [0001] The invention belongs to the technical field of space power supplies, in particular to a current-limiting control circuit of a laser load distributor for space. Background technique [0002] The satellite laser load is a new type of satellite load. There is a large capacitor in the load power amplifier driver. The laser load needs to release a large amount of energy in a short time, which will cause large voltage fluctuations in the power supply of its power distribution, so it cannot be directly Attached to the platform busbar. A new type of satellite laser load distributor came into being. Its functions are: 1. Transform the 42V busbar of the platform to provide a suitable busbar voltage for the laser load; The ability to output current, that is, the ability to charge a large load with a current limit. [0003] At present, the satellite power system will use S4R or S3R two power topology control methods. The current-limiting charging control princ...

AI Technical Summary

Problems solved by technology

The control method of this current-limited charging is simple, and it is mostly used for average current control, but the ripple of the charging current will be relatively large, and the conduction voltage drop of the diode will be affected by high and low temperatures and have a greater impact on the current-limiting point.

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