Direct-current magnetic bias suppression method and device for dual-active-bridge direct-current 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 improvement Accuracy and stability, elimination of interference and noise, effects of elimination of offset voltage

Active Publication Date: 2021-01-15
西安奇点能源股份有限公司
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  • Claims
  • Application Information

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Problems solved by technology

Connecting DC blocking capacitors in series will bring greater power loss and service life problems. The active control metho

Method used

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  • Direct-current magnetic bias suppression method and device for dual-active-bridge direct-current converter
  • Direct-current magnetic bias suppression method and device for dual-active-bridge direct-current converter
  • Direct-current magnetic bias suppression method and device for dual-active-bridge direct-current 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 for 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 entire The bridge inverter circuit is connected in parallel with the 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] Both the full-bridge inverter circuit and the full-bridge rectifier circuit are composed of four fully-controlled power semiconductor devices that form a bridge circuit; the fully-controlled power semiconductor devices form a bridge circuit that includes a diode and a triode as a power electronic switch, and the collector of the triode is co...

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Abstract

The invention discloses a direct-current magnetic bias suppression method and device for a dual-active-bridge direct-current converter. The method comprises steps of transmitting an input voltage to aband-pass filter for filtering through employing the impact on an input voltage ripple from a direct-current bias in the dual-active-bridge direct-current converter, and inputting a filtering voltageto two independent voltage integration circuits, wherein the integral period is a half period. And the integral voltage of each half period being inputted into the sample hold circuit, the sampled integral voltage being inputted into the control regulator by subtracting the integral voltage, an error signal of the duty ratio being outputted and superposed with a driving signal of the original duty ratio, the final duty ratio being obtained, and the driving signal being outputted. In practice, a voltage source is not an ideal voltage source and is generally composed of a converter, and therefore ripples of a preceding-stage power supply can be superimposed on input voltage ripples. The band-pass filter is adopted to filter the input voltage, direct current bias can be suppressed only by considering the switching frequency of the dual-active-bridge direct current converter, and practicability and reliability of the system are improved.

Description

technical field [0001] The invention belongs to the technical field of DC converter control, and in particular relates to a DC bias suppression method and device for a dual active bridge DC converter. Background technique [0002] Dual Active Bridge DC converter (Dual Active Bridge, DAB) is widely used in distributed power generation, new energy electric vehicles, uninterruptible power supply And other high-power occasions are widely used. 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. The DC bias will lead to an increase in the peak value of the inductor current, an increase in switching loss and stress, and even an excessive DC bias will cause saturation of the magnetic components, a spike in the current, and an increase in temperature, which will eventually cause the circuit to burn out. [0003] At present, the traditional method of el...

Claims

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Application Information

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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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