A mppt photovoltaic charging control system
A charging control and photovoltaic technology, applied in current collectors, electric vehicles, electrical components, etc., can solve the problems of low charging efficiency, limited use occasions, high heat, etc., to improve charging efficiency, reduce original size, and reduce ripple. Effect
Active Publication Date: 2019-02-26
ZHEJIANG TTN ELECTRIC
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Problems solved by technology
The present invention can charge a 12V storage battery in a preset mode within the range of 5V-26V. Although the photovoltaic charging control system works stably and reliably, its function is single, the application occasions are relatively limited, the charging efficiency is low, and the service life of the storage battery is limited.
[0003] In addition, a buck-based MPPT energy-consuming charging controller in the prior art, when a single buck converter is used for high-current output, will generate high heat due to the increase of internal stress of the device, and the efficiency is relatively low. Low
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[0033] Such as Figure 1-8 Shown, a kind of MPPT photovoltaic charge control system, this system includes a power supply module, described power supply module is the flyback power supply that switching power supply chip UC3848 and high-frequency transformer constitute; Described power supply module supplies power for the whole system; The present invention The MPPT photovoltaic charging control system needs a positive and negative 12V power supply when sampling, and the control circuit needs a 3.3V power supply. The solar energy is converted into a positive and negative 12V by the module, and then 3.3V is obtained by stepping down. The system achieves good results by separately supplying the same power supply to the analog circuit and the digital circuit through magnetic bead isolation.
[0034] The MPPT photovoltaic charging control system unit includes: a main circuit module, the main circuit module has a BUCK circuit and a current detection circuit; the BUCK circuit adopts ...
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The invention relates to an MPPT (Maximum Power Point Tracking) photovoltaic charging control system, which comprises a power supply module, a main circuit module, a control circuit module, a PWM driving circuit module, a storage battery and an MCU controller, wherein the PWM driving circuit module adopts a photo-isolator to drive BUCK circuits. The MPPT photovoltaic charging control system is provided with two BUCK circuits. The BUCK circuit is formed by connecting a BUCK 1 and a BUCK 2 in parallel, wherein the BUCK 1 is formed in a mode of (mos1 mos2) L1 (D1 D2), the BUCK 2 is formed in a mode of (mos3 mos4) L1 (D3 D4). The two-phase buck alternatively drives the PWM driving circuit module. The MCU controller controls the main circuit module to charge the storage battery. The control system provided by the invention can charge the storage battery in a three-stage manner according to characteristics of the storage battery, can also perform pre-charging on an over-discharged battery at the same time, is high in efficiency, and effectively prolongs the service life of the storage battery; a two-phase BUCK alternative parallel circuit topology is adopted, the charging efficiency is effectively improved, the size of an original element is reduced, and the ripple is reduced.
Description
technical field [0001] The invention relates to the technical field of solar photovoltaic charging, in particular to an MPPT photovoltaic charging control system. Background technique [0002] The Chinese invention patent application with the application number 201210024839.X discloses a wide-voltage input intelligent photovoltaic charging control system with MPPT function, including a solar cell array and a battery. The solar cell array is connected to a buck-boost circuit, and the buck-boost circuit is connected to a charging circuit, the charging circuit is connected to the storage battery; it also includes a single-chip controller, the single-chip controller is connected to the charging circuit, the output terminal of the charging circuit is fed back to the single-chip controller through the current and voltage detection circuit, and the single-chip controller is also connected to the buck-boost through the switch PWM control circuit The storage battery is also connected...
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IPC IPC(8): H02J7/00
CPCH02J7/00304H02J7/00306H02J7/0034H02J7/0068H02J7/00718H02J7/007184Y02E60/10
Inventor 滕敏亮滕军雷建峰
Owner ZHEJIANG TTN ELECTRIC