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A current-limiting control circuit of laser load distributor for space

A power distribution and laser technology, which is applied to lasers, laser components, semiconductor lasers, etc., can solve problems such as impact and large charging current ripple, and achieve excellent performance, high precision current limiting control, and small current ripple.

Active Publication Date: 2020-12-18
SHANGHAI INST OF SPACE POWER SOURCES
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  • Abstract
  • Description
  • Claims
  • Application Information

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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  • A current-limiting control circuit of laser load distributor for space
  • A current-limiting control circuit of laser load distributor for space
  • A current-limiting control circuit of laser load distributor for space

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Embodiment Construction

[0037] In order to make the object, technical solution and advantages of the present invention clearer, the embodiments disclosed in the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0038] Such as figure 1 , the output bus of the laser load distributor is connected to the large capacitor C2 inside the load power amplifier driver (capacity value is 10mF level), and the load power amplifier driver discharges the capacitor C2 instantaneously at a frequency of 20HZ. The discharge time is about 0.3ms~0.5ms, and the discharge current About 180A, the discharge will release part of the energy of the capacitor C2 and pull down the bus voltage of the distributor. In order not to cause too much current fluctuation to the 42V bus of the whole star, the laser load distributor needs to recharge the large capacitor C2 inside the load power amplifier driver in the way of current limiting charging in the remaining time, and stabil...

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Abstract

The invention discloses a current-limiting control circuit of a laser load distributor for space, comprising: a current loop PI, a base resistor, a protection resistor, a triode, a collector resistor, a soft-start capacitor and a PWM control chip; an output terminal of the current loop PI The base resistor is connected to the base of the triode; one end of the collector resistor is connected to the collector of the triode, and the other end is connected to the soft start pin of the PWM control chip; the emitter of the triode is grounded; the protection resistor is connected in parallel to the base of the triode and Emitter; one end of the soft-start capacitor is connected to the 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 the full duty cycle output state, and the triode is in a deeply saturated state. By controlling the turn-on time of the triode to Control the voltage of the soft start pin of the PWM control chip, and then control the maximum output duty cycle of the PWM control chip to achieve current-limited output. The invention realizes the current limiting control of the satellite laser load distributor.

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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/36H02M1/32H01S5/042
CPCH01S5/042H02M1/32H02M1/36H02M1/322
Inventor 李小春吕锋徐刚程新薛鸿翔李进李后春
Owner SHANGHAI INST OF SPACE POWER SOURCES
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