Balanced output system based on multi-winding transformer

A technology of multi-winding transformers and output systems, applied in current collectors, transportation and packaging, electric vehicles, etc., can solve the problems of large size of voltage equalization circuit, unsuitable battery cells, and complexity of control methods.

Active Publication Date: 2021-04-20
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0004] Chinese Invention Patent (Application No. CN201410211996.0) discloses a battery pack equalization circuit based on multi-secondary transformers and its implementation method, by using multi-secondary transformers and corresponding The module balances the energy between the batteries and realizes the modularization of the balanced circuit, but the control method has certain complexity and has certain requirements for control accuracy, which wil

Method used

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  • Balanced output system based on multi-winding transformer
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  • Balanced output system based on multi-winding transformer

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Embodiment

[0036] Such as figure 1 As shown, this embodiment discloses a structural diagram of a balanced output system based on a multi-winding transformer as shown in figure 1 as shown, figure 2 is when the primary side has 4 windings and N 1 :N 2 The circuit diagram of the balanced output system when =1:10, including a battery unit module, a multi-winding transformer, two sets of switch tubes, a controller and a filter module, wherein, when the balanced output system is in the output state and charging state, respectively Two sets of different PWM control signals are generated to control the turn-on and turn-off of two sets of switching tubes (group A switching tubes and group B switching tubes).

[0037] Both group A switch tube and group B switch tube are composed of an N-channel MOSFET, and group A switch tube includes switch tube SQ 1 、SQ 2 、SQ 3 、SQ 4 , Group B switching tubes include switching tubes SQ 0 . Switch tube SQ 1 、SQ 2 、SQ 3 、SQ 4 The S poles of the multi...

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Abstract

The invention discloses a balanced output system based on a multi-winding transformer. The system comprises a battery unit module, a multi-winding transformer, two groups of switch tubes, a controller and a filter module, and when the output is carried out, the controller generates a PWM signal with a fixed duty ratio to drive a primary side switch tube and control a secondary side switch tube to be in an off state; equalization of the battery pack is achieved through forward excitation, and a secondary side output function is achieved through flyback excitation; and when the battery unit module is charged, the controller generates the PWM signal with the fixed duty ratio to drive the secondary side switch tube, the primary side switch tube is controlled to be in an off state, and the function of charging the primary side battery unit module is achieved through flyback. The multi-winding transformer is used for balancing the battery unit modules, the secondary side of the transformer is used for achieving external output, the available capacity of the battery pack is improved, the service life of the battery pack is prolonged, and meanwhile the integration level of a balance system is improved.

Description

technical field [0001] The invention relates to the technical field of active equalization of battery energy, in particular to an equalized output system based on a multi-winding transformer. Background technique [0002] Batteries are widely used in artificial satellites, hybrid electric vehicles, electric vehicles, uninterruptible power supplies, and photovoltaic systems due to their advantages in cycle life, mass specific energy, and volume specific energy. These applications often require a high voltage power supply. However, the terminal voltage of a battery is relatively low, and in order to achieve the required voltage level, multiple batteries need to be connected in series to form a battery pack to meet the voltage required by these applications. During operation, the battery is repeatedly charged and discharged, and due to the different chemical and electrical characteristics of the battery during the manufacturing process, there may be inconsistencies between bat...

Claims

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Application Information

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IPC IPC(8): H02J7/00
Inventor 康龙云徐鹏罗璇林鸿业卢楚生
Owner SOUTH CHINA UNIV OF TECH
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