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Method and device for suppressing DC bias of a dual active bridge DC converter

A technology of DC bias suppression and DC converter, which is applied in the direction of converting DC power input to DC power output, output power conversion devices, instruments, etc., can solve the problems of high power loss and service life of series DC blocking capacitors, and achieve suppression Effects of DC bias, elimination of interference and noise, and elimination of offset voltage

Active Publication Date: 2022-06-07
西安奇点能源股份有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Connecting DC blocking capacitors in series will bring greater power loss and service life problems. The active control method of sampling current has relatively high requirements on the sampling accuracy and bandwidth of the current sampling module.

Method used

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  • Method and device for suppressing DC bias of a dual active bridge DC converter
  • Method and device for suppressing DC bias of a dual active bridge DC converter
  • Method and device for suppressing DC bias of a dual active bridge DC converter

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Embodiment Construction

[0027] Further description will be given below in conjunction with the accompanying drawings.

[0028] see figure 1 , a DC bias suppression circuit of a dual active bridge DC converter, including a full-bridge inverter circuit, a transformer T and a full-bridge rectifier circuit; the transformer T is arranged between the full-bridge inverter circuit and the full-bridge rectifier circuit, and the full-bridge inverter circuit Bridge inverter circuit parallel input capacitor C 1 and the input voltage V 1 , the full-bridge rectifier circuit is connected in parallel with the output capacitor C 2 and the output voltage V 2 .

[0029] The full-bridge inverter circuit and the full-bridge rectifier circuit are four fully-controlled power semiconductor devices to form a bridge circuit; the fully-controlled power semiconductor devices constitute a bridge circuit including a diode and a triode as a power electronic switch, and the collector of the triode is connected The anode of the...

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PUM

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Abstract

The invention discloses a DC bias suppression method and device for a dual active bridge DC converter. The device of the invention utilizes the influence of the DC bias on the input voltage ripple in the dual active bridge DC converter to The input voltage is sent to a band-pass filter for filtering, and the filtered voltage is input to two independent voltage integration circuits, and the integration period is half a period. The integral voltage of each half cycle is input to the sample-and-hold circuit, and the sampled integral voltage is input into the control regulator as a difference, and the error signal of the output duty cycle is superimposed with the driving signal of the original duty cycle to obtain the final duty cycle size, the output drive signal. In practice, the voltage source is not an ideal voltage source, and is usually composed of a converter, so the ripple of the previous power supply will be superimposed on the input voltage ripple. The invention adopts a band-pass filter to filter the input voltage, and only needs to consider the switching frequency of the double active bridge DC converter to suppress the DC bias, thereby improving the practicability and reliability of the system.

Description

technical field [0001] The invention belongs to the technical field of direct current converter control, and in particular relates to a method and device for suppressing direct current bias of a double active bridge direct current converter. Background technique [0002] Dual Active Bridge DC Converter (DAB) has many advantages such as bidirectional energy flow, high power density, electrical isolation, easy to achieve soft switching, etc., so it is widely used in distributed generation, new energy electric vehicles, uninterruptible power It is widely used in high power occasions. However, due to the incomplete symmetry of the parasitic parameters of the circuit hardware and the delay of the driving signal, the DC bias of the high-frequency transformer occurs. DC bias can lead to increased inductor current peaks, switching losses and stress, and even excessive DC bias can saturate the magnetics, cause current spikes, increase temperature, and eventually burn out the circuit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/335H02M1/32H02M1/40H02M1/08H02M1/088
CPCH02M3/33584H02M1/32H02M1/40H02M1/08H02M1/088Y02B70/10
Inventor 刘增刘仡然张宏伟刘进军
Owner 西安奇点能源股份有限公司
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