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Starting control method for input-series output-quasi-parallel multiplexed output converter

A multi-channel output and series output technology, applied in the direction of output power conversion devices, electrical components, etc., can solve problems such as excessive starting voltage and starting current, DC-DC damage, overvoltage, etc., to avoid excessive input voltage Effect

Active Publication Date: 2014-05-21
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to realize the start-up soft start of the input series output quasi-parallel multi-output converter, and solve the problem of DC-DC damage caused by excessive starting voltage and starting current
[0007] The invention provides a method of combining variable sampling reference voltage value and DCX variable frequency variable duty ratio to solve the problem of overvoltage when starting up

Method used

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  • Starting control method for input-series output-quasi-parallel multiplexed output converter
  • Starting control method for input-series output-quasi-parallel multiplexed output converter
  • Starting control method for input-series output-quasi-parallel multiplexed output converter

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Embodiment 1

[0025] as attached image 3 As shown, when starting, in order to prevent the main power from being directly applied to both ends of the DC-DC converter, the DCX and DC-DC drivers can be turned off when the main power is first added, and their duty ratios are set to zero, so that The input voltage of DCX and DC-DC will be established slowly according to the relationship of the input voltage dividing capacitor. The voltage dividing capacitor adopts 1:9 distribution to ensure that the input voltage of DC-DC is one-tenth of that of the main power supply, and the input voltage of DCX is nine-tenths of that of the main power supply. At the same time, for the convenience of analysis, the case where DCX has two outputs is considered here, as shown in the attached image 3 shown. When DCX is multi-output with image 3 The control principle of the two outputs is the same.

[0026] image 3 , the auxiliary power supply of the microcontroller is controlled by V in obtained after tra...

Embodiment 2

[0036] The flow chart of start-up control of the present invention is as attached Figure 5 Shown, the control process of the present invention is as follows:

[0037] 1) The auxiliary supply is supplied by V in obtained after transformation, when the main voltage V in When it comes, the auxiliary power supply starts to work and supplies power to the single-chip microcomputer. The single-chip microcomputer first initializes DCX and DC-DC, and sets the switching frequency of DCX f s_DCX =450kHz, DC-DC switching frequency f DC_DC =90kHz, and the duty cycles of both DCX and DC-DC are zero. Set the value of sampling reference voltage corresponding to 3V output voltage.

[0038] 2) After the input voltage is established, the PWM interrupt is turned on, and the system enters closed-loop regulation. The MCU defines the flag bit Flag=0. In the interrupt program, set the duty cycle of DCX to a smaller value D DCX =0.1, the output voltage is stable at 3V output;

[0039] 3) Afte...

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Abstract

The invention discloses a starting control method for an input-series output-quasi-parallel multiplexed output converter and belongs to the field of the electrical energy transformation. The starting control method mainly includes initializing a system of a single chip and initializing PWM when starting up, waiting for establishing an input voltage, making the PWM enable interrupts, making a DCX open a duty ratio, regulating a feedback reference voltage value, regulating a switching frequency of the DCX, and regulating a duty ratio of the DCX and a closed loop PI regulating program of a DC-DC converter so as to realize the soft starting of a circuit and avoid the circuit damage due to unbalanced voltage distribution when starting.

Description

technical field [0001] The invention relates to a start-up control method suitable for multi-channel output converters with series input and quasi-parallel output, belonging to the field of electric energy conversion. Background technique [0002] After entering the 21st century, people have entered a brand-new society of information transmission, exchange and instruction. Work, lifestyle and entertainment are undergoing tremendous changes, and communication has become an indispensable means of communication between people. The diversification of communication is developing in the direction of fast, realistic, and resource-saving. As a hardware environment, personal computers and servers will become the necessary basic facilities for communication networks. The trend of network construction and computer products is becoming increasingly modularized and standardized, and a distributed power supply system is formed with a building block structure. [0003] According to the st...

Claims

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Application Information

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IPC IPC(8): H02M1/36
Inventor 任小永庞振进张强陈乾宏张之梁阮新波
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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