Output short-circuit protection circuit and method of low-power photovoltaic controller
A photovoltaic controller and output short-circuit technology, which is applied in the direction of electrical components, electronic switches, pulse technology, etc., can solve the problems of photovoltaic controller output short-circuit, etc., and achieve the effect of safe and reliable protection performance, easy implementation, and small size
Active Publication Date: 2015-01-21
南通乐创新能源有限公司
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Problems solved by technology
[0005] The purpose of the present invention is to solve the problem of the output short circuit of the existing photovoltaic controller, and to provide a protection circuit with simple structure and stable protection performance
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[0013] The present invention will be further elaborated below in conjunction with accompanying drawings, and its structure and method can be realized by those skilled in the art.
[0014] The principle of the invention is as figure 1 As shown, the circuit consists of six parts: DC unit, inductor and freewheeling unit, current detection and control unit, overload current signal sampling filter circuit and switch unit. The DC unit refers to the charging circuit, battery, etc., which are used to charge and store energy; the inductor and freewheeling unit contain inductors, capacitors, diodes and other components, which are used for smooth filtering and suppress the output circuit when a short circuit occurs in the output circuit. The rapid increase of the current protects the power switching devices in the switching unit; the switching unit is mainly a power switching device, which is used to turn on and off the DC output; the current detection and control unit has resistors, dio...
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The invention relates to the technical field of direct current power supply protection, and in particular relates to a direct-current output short-circuit protection circuit of a low-power photovoltaic system. A storage battery inputs direct current into an inductor and follow-current unit consisting of a D1, an L1 and a C1 through a DC+ and a DC-; a current detection and control unit consists of a Q1, an R1, an R3, an R5, an R6, a D2 and a Q2; an overload current signal sampling filtering circuit consists of an R4 and a C3. The certain voltage is generated through a current sampling resistor of the R3, the Vi is further smaller than the Vbe of the triode Q2 during regular operation, current flowing through the resistors R2 and R3 is emergently increased when the short circuit is output, the triode Q2 is switched on when the Vi is larger than Vbe, the voltage of a Q2 collection electrode is dropped to 0V, the diode D2 is switched on, the voltage of a grid of the switch tube Q1 is dropped to approximate to zero, and the current I of a circuit is limited to be equal to Vbe / R3. The output short-circuit protection circuit disclosed by the invention has the advantages of simple structure, small volume, easiness for implementation, and safe and reliable protection performance.
Description
[technical field] [0001] The invention relates to the technical field of DC power supply protection, in particular to a short-circuit protection circuit for output of a low-power photovoltaic controller and a method thereof. [Background technique] [0002] In order to solve the problems of energy shortage and environmental degradation, most countries, including China, are vigorously developing photovoltaic power generation systems and taking photovoltaic power generation systems as the main energy source in the future. [0003] Photovoltaic power generation system, due to the huge cost of smart grid and transmission circuit construction, has gradually turned to a small household photovoltaic system, and the unit power is controlled at 20Wp-500Wp. Photovoltaic power generation system, LED lighting, and DC power supply system have gradually become a development trend , that is, the DC power generated by photovoltaics is stored in the DC energy storage unit, and through DC powe...
Claims
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IPC IPC(8): H03K17/08
Inventor 张强胜毛晓娟
Owner 南通乐创新能源有限公司