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Method for achieving paralleled current sharing of high-voltage and high-power source

A technology of high-power power supply and implementation method, which is applied in the direction of parallel operation of DC power supplies, can solve problems such as the inability to use high-voltage power supplies, achieve high promotion and application value, and reduce losses

Active Publication Date: 2013-12-11
THE 724TH RES INST OF CHINA SHIPBUILDING IND
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Problems solved by technology

[0004] However, UC3902 is a dedicated current-sharing control chip developed for low-voltage output module power supplies. The maximum withstand voltage of its internal correction amplifier transistor is 20V, so its maximum operating voltage rating is 20V, which cannot be directly used in high-voltage power supplies. use on

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  • Method for achieving paralleled current sharing of high-voltage and high-power source

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[0011] A method for realizing parallel current sharing of high-voltage and high-power power supplies of the present invention. For specific implementation steps, see figure 1 :

[0012] 1. Use the optocoupler to sample the output voltage to obtain an isolated voltage feedback signal;

[0013] 2. Use the Hall current sensor to sample the output current of the power supply to obtain an isolated positive low voltage current sampling signal;

[0014] 3. The current sampling signal is inverted by the error amplifier to generate a negative voltage current sampling signal;

[0015] 4. After the current sampling signal is sent to UC3902 and the bus voltage for comparison and error amplification, the voltage feedback signal at the output terminal of the optocoupler is adjusted to adjust the output voltage of the power supply to achieve the purpose of parallel current sharing of the power supply.

[0016] A method for realizing parallel current sharing of high-voltage and high-power p...

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Abstract

The invention relates to a method for achieving paralleled current sharing of a high-voltage and high-power source. The achieving method breaks through the using range of a current sharing chip UC3902 and makes the current sharing chip UC3902 commonly used in a low-voltage power source successfully applied to a high-voltage and high-power source parallel system. As is shown in the figure, according to the functional block diagram of the application method, a positive current sampling signal is obtained through a sampled output current of a Hall current sensor, and then the current sampling signal is fed to a current sharing circuit after being processed by a phase inverter in a phase inverting mode; after the current sampling signal is compared with a bus voltage signal, an output voltage feedback signal isolated by an opto-isolator is adjusted, so that the output voltage of the power source is adjusted, and the purpose of achieving paralleled current sharing of the power source is achieved. In the achieving method, the sampling signal and the feedback signal are both isolated from the power source, usage of the current sharing circuit is not limited by the output voltage and the output current of the power source, and therefore the achieving method has extensive application prospects in the field of power sources.

Description

technical field [0001] The invention belongs to special power supply technology, adopts UC3902 chip and optocoupler isolation circuit to realize parallel current sharing of high voltage and high power DC power supply. Background technique [0002] Running power supplies in parallel has many advantages. For example, multiple low-power power supplies are used to form a high-power power supply system; the redundant design of the power supply system can be realized, and the reliability of the power supply system can be improved. However, when the power supplies work in parallel, it is necessary to ensure that each power supply in the power system is equally loaded, otherwise the power supply with a larger output current will work in a high-power state for a long time, and the reliability of the power supply will be reduced. Once the power supply is damaged, the entire power supply system will be paralyzed . [0003] There are many schemes for power supply parallel current shar...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J1/10
Inventor 杨香兵蔡宝龙
Owner THE 724TH RES INST OF CHINA SHIPBUILDING IND
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