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Charging circuit topology for solar controller under comprehensive protection and control method thereof

A solar controller and charging circuit technology, applied in emergency protection circuit devices, battery circuit devices, circuit devices, etc., can solve problems such as discontinuous charging current, battery short circuit, personal injury, etc., and achieve continuous and smooth charging current, shock voltage The effect of small stress, safe and reliable work

Active Publication Date: 2013-07-31
EAST GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the existing solar controller technology, in the main circuit for charging the battery from the solar cell, the switching tube is usually directly used to control the on and off of the charging circuit, and there is no freewheeling circuit and inductor in the main charging circuit energy components, the charging current is discontinuous, and the sudden change of the charging current causes a large impact voltage stress on the charging switch tube, which may easily cause the switch tube to be broken down by overvoltage.
Especially when the input voltage of the solar cell is very high and the voltage level of the equipped battery is low, due to the large pressure difference between the input voltage and the output voltage of the charging circuit, the impact voltage stress of the charging switch tube will increase sharply, and the charging switch tube will heat up seriously. , the heat loss rises sharply, and the accident of damage to the charging switch tube is extremely prone to occur
[0003] On the other hand, due to the discontinuous charging current and the difficulty of current sampling, when the solar controller adopts the maximum power point tracking (MPPT) algorithm, the improvement of the maximum power point tracking efficiency is limited.
[0004] There are also some solar charge controllers in the prior art, which add inductance elements to the main charging circuit, but usually there is no perfect anti-reverse connection protection measure. Short circuit, the strong current formed at the moment of battery short circuit can easily cause serious accidents such as fire and personal injury

Method used

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  • Charging circuit topology for solar controller under comprehensive protection and control method thereof
  • Charging circuit topology for solar controller under comprehensive protection and control method thereof
  • Charging circuit topology for solar controller under comprehensive protection and control method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] A charging circuit topology for a solar controller with full protection, such as figure 1 As shown, a solar cell 100 , an inductance unit 200 , a charge control switch unit 300 , an anti-backflow switch unit 400 connected in a synchronous rectification mode, an auxiliary switch unit 900 , a diode unit 500 and a battery 600 are provided.

[0054] Solar battery 100 , inductance unit 200 , charge control switch unit 300 , anti-backflow switch unit 400 , auxiliary switch unit 900 and storage battery 600 are connected in series to form a main charging circuit. Charge control switch unit 300 is connected to one end of solar battery 100 .

[0055] The diode unit 500, the inductance unit 200, the anti-backflow switch unit 400, the auxiliary switch unit 900 and the battery 600 are connected in series to form a charging freewheeling circuit.

[0056] The charging circuit topology of the solar controller with comprehensive protection adopts the following control mode: the charging...

Embodiment 2

[0059] A charging circuit topology for a solar controller with full protection, such as figure 2 As shown, the other structures are the same as in Embodiment 1, and also have the following features: the inductance unit 200 is set as an inductor L1, the charge control switch unit 300 is set as a charge control switch tube VT1, and the anti-backflow switch unit 400 is set as an anti-backflow switch The transistor VT2, the auxiliary switching unit 900 is configured as an auxiliary switching transistor VT3, and the diode unit 500 is configured as a diode D1.

[0060] The charge control switch tube VT1 can be set as a MOSFET tube or an IGBT tube. The anti-backflow switch tube VT2 can be set as a MOSFET tube or an IGBT tube. The auxiliary switch tube VT3 can be set as a MOSFET tube or an IGBT tube.

[0061] The control method of the charging circuit topology of the solar controller with full protection is:

[0062] The switch control of charge control switch tube VT1 adopts PWM ...

Embodiment 3

[0071] A charging circuit topology for a solar controller with full protection, such as image 3 As shown, other structures are the same as those in Embodiment 2, except that a fuse 700 , a current sampling circuit 800 and a lightning protection circuit 111 are also provided. The solar battery 100, the inductance unit 200, the charge control switch unit 300, the anti-backflow switch unit 400, the insurance tube 700, the storage battery 600 and the current sampling circuit 800 are connected in series to form a charging main circuit, the inductance unit 200, the charge control switch unit 300, the anti- The topological positions of the reverse flow switch unit 400, the fuse 700 and the current sampling circuit 800 can be changed. The lightning protection circuit 111 is connected in parallel with the input terminal of the solar cell 100 .

[0072] The specific connection method is: a lightning protection circuit 111 is connected in parallel between the positive input terminal PV...

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PUM

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Abstract

The invention relates to a charging circuit topology for a solar controller under comprehensive protection and a control method thereof. The charging circuit topology is characterized in that a solar cell is serially connected with an inductor unit, a charging control switch unit, an anti-backflow switch unit, an auxiliary switch unit and a storage cell, thereby forming a main charging loop; and a diode unit, the inductor unit, the anti-backflow switch unit, the auxiliary switch unit and the storage cell are connected in series, thereby forming a charging follow current loop. The control method is characterized in that a PWM (Pulse Width Modulation) mode is adopted for the charging control switch unit, a positive driving voltage is applied to the anti-backflow switch unit in a charging process, the anti-backflow switch unit is controlled to be reliably switched off when no sunlight exists, the auxiliary switch unit is controlled to be normally switched on when the storage cell is normally connected, and the auxiliary switch unit is controlled to be reliably switched off when the storage cell is inversely connected. The charging circuit topology and the control method provided by the invention have the advantages that the charged current continuity is excellent and the tracking efficiency of a maximum power point is promoted. The charging circuit topology has the functions, such as anti-backflow function, solar cell polar inversed connection protection, storage cell polar inversed connection protection, over-current protection, lightning protection, and the like.

Description

technical field [0001] The invention relates to the technical field of solar controllers, in particular to a charging circuit topology and control method of a solar controller with comprehensive protection. Background technique [0002] In the existing solar controller technology, in the main circuit for charging the battery from the solar cell, the switching tube is usually directly used to control the on and off of the charging circuit, and there is no freewheeling circuit and inductor in the main charging circuit Energy components, the charging current is discontinuous, and the sudden change of the charging current causes a large impact voltage stress on the charging switch tube, which is easy to cause the switch tube to be broken down by overvoltage accidents. Especially when the input voltage of the solar cell is very high and the voltage level of the equipped battery is low, due to the large pressure difference between the input voltage and the output voltage of the ch...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J7/00H02H7/18H02H11/00
Inventor 韩军良宋青华徐海波郑少忠
Owner EAST GRP CO LTD