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Control method and system for DCDC (Direct Current to Direct Current) converter

A control method and control system technology, applied in the control method and system field of DCDC converters, can solve the problems of large loss, low efficiency, large current, etc., reduce copper loss and magnetic loss, reduce current effective value, and reduce conduction The effect of pass loss

Active Publication Date: 2013-04-10
SHENZHEN SINEXCEL ELECTRIC
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0014] The present invention is aimed at the control method and system of the existing step-up DCDC converter with LLC topology structure, the bus voltage U bus In order to stabilize the DC, the input current I in It is a waveform that changes periodically, and the current at the peak is large, so that the loss is large and the efficiency is low. A control method and system for a DCDC converter is provided, which can make the bus voltage U bus dither up so that the input current I in The envelope curve becomes a straight line, reducing the conduction loss of MOS tubes and diodes in DCDC converters

Method used

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  • Control method and system for DCDC (Direct Current to Direct Current) converter
  • Control method and system for DCDC (Direct Current to Direct Current) converter
  • Control method and system for DCDC (Direct Current to Direct Current) converter

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Embodiment Construction

[0047] The present invention will be further explained below in conjunction with the accompanying drawings and embodiments.

[0048] The control method and system of the DCDC converter of the present invention, by allowing the bus voltage U bus jitter up, so that the DCDC converter input current I in , diode rectified current I rec and bus current I bus It becomes a straight line. When the same energy is transferred, the effective value of the current decreases, thereby reducing the conduction loss of the entire loop, reducing the conduction loss of the MOS tube and diode, and reducing the copper loss and magnetic loss of the DCDC transformer.

[0049] When the inverter in the DCDC converter is working, the output voltage Uac (that is, the AC voltage of the inverter) is:

[0050] U ac = 220 2 sin ( 314 t ) , ...

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Abstract

The invention discloses a control method and system for a DCDC (Direct Current to Direct Current) converter. The system comprises a sampling device, a first computer, a second computer and a pulse width modulation signal generating unit. The method comprises the following steps of: (S1) sampling a bus voltage Ubus, an inverter alternating current voltage Uac(t) and an alternating current Iac (t) of the DCDC converter; (S2) figuring out a given value Ubusref of the bus voltage according to the inverter alternating current voltage Uac(t) and the alternating current Iac (t); (S3) figuring out an error value between the given value Ubusref of the bus voltage and the bus voltage Ubus; and (S4) generating a pulse width modulation signal according to the error value and outputting the pulse width modulation signal to an MOS tube base of the DCDC converter. Therefore, the bus voltage Ubus is jittered, so that an envelope line of the input current Iin is changed into a straight line and the conduction losses of an MOS tube and a diode in the DCDC converter are reduced.

Description

technical field [0001] The present invention relates to a DCDC converter, more specifically, to a control method and system for a DCDC converter. Background technique [0002] Such as figure 1 As shown, the LLC topology circuit is a high-efficiency solution for raising a low-voltage battery to a high voltage, which can achieve high frequency, high efficiency, and low cost. [0003] According to the control method discussed and used in the current literature and products, the output voltage Uac of the DCDC converter is constant. When the output is single-phase, the current peak at the peak of the sinusoidal waveform reaches the maximum, resulting in an increase in the effective value of the current. , the loss increases and the efficiency decreases. [0004] figure 1 The converter shown is a boost DCDC converter with LLC topology, I in is the input current of the DCDC converter, I rec is the diode rectified current, I bus is the bus current. When the inverter is workin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/537H02M3/335
Inventor 王民康蔡劲松
Owner SHENZHEN SINEXCEL ELECTRIC
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