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Bus voltage soft actuating method in uninterrupted power source and its device

A technology of bus voltage and soft start, which is applied to battery circuit devices, circuit devices, electric vehicles, etc., can solve the problems of increased cost and reduced reliability, and achieve the effects of improving reliability, reducing impact, and satisfying soft start characteristics

Inactive Publication Date: 2004-03-03
LIANYUNGANG DAFA ENVIRONMENTAL PROTECTION TECH CO LTD
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this scheme is: it can only be applied in low power occasions
The disadvantage of this solution is that a current limiting resistor needs to be added, which not only increases the cost, but also reduces the reliability

Method used

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  • Bus voltage soft actuating method in uninterrupted power source and its device
  • Bus voltage soft actuating method in uninterrupted power source and its device
  • Bus voltage soft actuating method in uninterrupted power source and its device

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Embodiment Construction

[0021] The present invention will be described in further detail below through specific embodiments and in conjunction with the accompanying drawings.

[0022] See image 3 It is a schematic diagram of the soft start solution of the present invention, wherein the negative pole of the battery is connected to the neutral line of the commercial power. The DC / DC circuit transfers the energy of the battery to the positive and negative bus bars after power conversion. The circuit is controlled by a digital control module. The digital control module detects the output voltage as a feedback value, and then controls the driving signal of the DC / DC circuit according to a certain soft-start law (curve), so that the bus voltage changes according to the designed law, thereby realizing the soft-start function.

[0023] The main control method of the digital control module is: set a given voltage Vref to make it meet the law of soft start, and then make the bus voltage track the shape of V...

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Abstract

Energy of battery through power inversion is transmitted to positive / negative bus line. In charging process, power inverted output voltage is detected as feedback value Controlling signal for driving power inversion circuit makes bus voltage change according to designed rule so as to make bus capacitance be charged according to soft starting rule. After charging is completed, electric power is input to power supply, entering normal working state. 'DC / DC circuit' and 'digital control module' are basic unit of digit controlled UPS without additional parts so as to lower cost and raise reliability. The digit controlled soft starting process can be based on soft starting curve designed smartly in order to reach satisfied soft starting feature and reduce impaction to bus capacitance. Moreover, the invention can test battery and DC / DC circuit.

Description

Technical field: [0001] The invention relates to a bus voltage soft start method and device in an uninterruptible power supply (UPS). Background technique: [0002] In the uninterruptible power supply (UPS), under the normal condition of the mains, only when the UPS bus voltage reaches a higher value, can the rated inverter voltage output. Therefore, before the inverter voltage is normally output, energy needs to be added to the DC bus to achieve startup. Because the main function of the bus filter capacitor is to store energy and filter, the capacitance is very large. In order to prevent the excessive charging current from causing impact on the fuse in the circuit, the copper skin on the printed board and the bus filter capacitor, reduce the Therefore, it is necessary to slowly charge the bus filter capacitor through some method. This is the so-called "soft start", also known as "slow start". [0003] All kinds of products in the UPS industry with UPS DC bus voltage soft-...

Claims

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Application Information

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IPC IPC(8): H02J7/00H02J7/04
Inventor 刘代兵
Owner LIANYUNGANG DAFA ENVIRONMENTAL PROTECTION TECH CO LTD
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