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Simple and easy flow equalization scheme of parallel system

A technology of parallel connection and scheme, applied in control/regulation system, output power conversion device, DC power input conversion to DC power output, etc., can solve the problems of large loss, large distortion, current distortion, etc., and achieve the effect of low cost

Inactive Publication Date: 2015-03-11
GUANGXI UNIV
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Obviously, current sampling is a key issue: using resistance sampling, the loss is relatively large, and the distortion after current amplification is relatively large; the cost of using a current sensor is high; sampling with a current transformer is not very convenient, and it will distort the current

Method used

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  • Simple and easy flow equalization scheme of parallel system

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Embodiment Construction

[0009] The derivation of the formula of the present invention will be further described below in conjunction with the accompanying drawings.

[0010] Such as figure 1 As shown, the current sensing circuit consists of a simple RC network.

[0011] Let the current flowing through the inductor L be I L , the current flowing through the capacitor C is I C , the voltage across the capacitor is V C , the voltage across the inductor L is V L , the output voltage is V O , the equivalent series resistance of the inductor is R 1 , then there is

[0012] V L +I L R 1 +V O =V C +I C R (1)

[0013] Calculate the average value of formula (1) in one switching cycle, and get:

[0014] V L is the average value of the voltage on the inductor in one switching cycle, obviously V L =0;

[0015] V O is the average value of the output voltage;

[0016] I L The average value of the inductor current is equal to the load current I Load ;

[0017] I C is the average v...

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Abstract

The invention provides a simple and easy flow equalization scheme of a parallel system. The parallel system consists of power supply modules with multiway switches in parallel connection, the flow equalization scheme adopts an independent PWM (Pulse Width Modulation) controller, output currents of all the power supply modules are sampled and fed back to the PWM controller, and output voltage of all the power supply modules is regulated by the PWM controller, so that the flow equalization of the output of all the power supply modules is achieved. The flow equalization scheme is characterized in that sampling of the output currents of all the power supply modules is realized through detecting voltages at both terminals of a capacitor C in an RC (Remote Control) network. For the flow equalization scheme of the parallel system, when the output currents of all the power supply modules are sampled, the sizes of a load current and an inductive current are detected, only the size of the voltage of the capacitor in the RC (Remote Control) network is required to be detected, by the method, the currents are conveniently, simply and easily sampled without depletion, the cost is low, and current distortion is not caused.

Description

technical field [0001] The invention relates to a current sharing scheme of a circuit system, in particular to a simple parallel system current sharing scheme. Background technique [0002] In the era of rapid development of modern science and technology, high-power DC power supply systems can be realized by connecting multiple switching power supply modules in parallel, which can not only increase the power supply capacity, but also improve the reliability of the power supply system. However, in practical applications, due to the differences between individual power modules, uneven current output of each module in the power system will occur during parallel operation, which will cause uneven distribution of current heat and thermal stress, and affect the service life of the power module. and reliability, so it is necessary to introduce a parallel system current sharing scheme to solve it. The common current sharing method is to use an independent PWM controller to control ...

Claims

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Application Information

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IPC IPC(8): H02M3/155
Inventor 莫彩网
Owner GUANGXI UNIV
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