Integrated design circuit of new buck-boost converter and charging and discharging circuit and equalization circuit
A charging and discharging circuit and circuit design technology, applied in the direction of charge equalization circuit, battery circuit device, circuit device, etc., can solve the problems of uncontrollable shunt current, energy waste, heat management, simple circuit structure, etc., and achieve the reduction of battery control system The effect of reducing the size, improving the equalization speed, and simplifying the circuit structure
Active Publication Date: 2018-04-03
NORTH CHINA UNIVERSITY OF TECHNOLOGY
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Problems solved by technology
The energy dissipation type circuit has a simple structure but low efficiency, cannot control the shunt current, and has problems such as energy waste and thermal management, so its application is limited
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[0034] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with specific embodiments and with reference to the accompanying drawings.
[0035] It should be noted that all expressions using "first" and "second" in the embodiments of the present invention are to distinguish two entities with the same name but different parameters or parameters that are not the same, see "first" and "second" It is only for the convenience of expression, and should not be construed as a limitation on the embodiments of the present invention, which will not be described one by one in the subsequent embodiments.
[0036]Buck-Boost converter, also known as buck-boost converter, is a single-tube non-isolated DC converter whose output voltage can be lower than or higher than the input voltage, and the polarity of the output voltage is the same as the input voltage. The Buck-Boost ...
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The invention discloses a novel Buck-Boost converter which is suitable for a storage battery pack formed by n single batteries through series connection and comprises 2 charge and discharge main circuit inductors, n-1 equalizing inductors and n+2 controllable switches, wherein n is a natural number greater than or equal to 1. The controllable switches are IGBT modules with which freewheel diodes are connected in parallel. The first controllable switch to the nth controllable switch are connected in series in turn. The negative electrodes of the first single battery to the n-1 single battery are respectively connected with the emission electrodes of the first controllable switch to the n-1 controllable switch through the first equalizing inductor to the n-1 equalizing inductor. The n+1 controllable switch is connected in series on the positive electrode of a DC bus. The n+2 controllable switch is connected in series on the negative electrode of the DC bus. The invention also provides an integrated design circuit of a charge and discharge circuit and an equalizing circuit. The integrated design circuit comprises a driving module, a control unit, a battery end voltage acquisition circuit and the novel Buck-Boost converter. The novel Buck-Boost converter and the integrated design circuit of the charge and discharge circuit and the equalizing circuit have functions of charge and discharge of the storage batteries and equalizing of voltage of the battery pack.
Description
technical field [0001] The invention relates to the technical field of an equalizing circuit with multiple batteries connected in series, in particular to a novel Buck-Boost converter and an integrated design circuit of a charging and discharging circuit and an equalizing circuit. Background technique [0002] The voltage of a single lithium battery is usually 3.2V according to its own chemical characteristics. Usually connected in series to meet the high voltage characteristics of the load. After multiple single batteries are connected in series to form a group, the current is equal, and the operating conditions of each battery can be reflected through the voltage. Due to the differences in the initial capacity, internal resistance, self-discharge rate, etc. of each single battery, the batteries have different charge and discharge characteristics, and the inconsistency will be enlarged after the battery has been charged and discharged many times, which will lead to the ove...
Claims
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IPC IPC(8): H02J7/00H02M3/155
CPCH02J7/0019H02J7/0072H02M3/155
Inventor 刘欣博王乃鑫王慧娴胡长斌万庆祝
Owner NORTH CHINA UNIVERSITY OF TECHNOLOGY