Over-current protection self-locking circuit for photovoltaic inverter
A photovoltaic inverter, self-locking circuit technology, applied in emergency protection circuit devices, electrical components and other directions
Inactive Publication Date: 2013-05-22
WUXI HODGEN TECH CO LTD
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Problems solved by technology
[0005] The purpose of the present invention is to invent a self-locking circuit for overcurrent protection applied to photovoltaic inverters in order to reduce damage to power tubes caused by sudden changes in the load of the inverter in view of the relatively fluctuating operating environment of the existing photovoltaic inverters
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[0013] figure 1 It is a functional block diagram of the present invention, wherein the detection circuit 1 and the first overload reference voltage circuit 2 are input to the first op amp U1, and are designed to control a relatively low-level overload protection circuit, between the input and output terminals The connected hysteresis circuit 4 can make the output high voltage more stable. In the same way, the detection circuit 1 and the second overload reference voltage circuit U2 are designed to control the comparison protection circuit with a higher overload range. After outputting the high level circuit 5, it is input to the self-locking circuit 6. The self-locking circuit also includes an operational amplifier. , the output of the operational amplifier and the output of the first operational amplifier U1 constitute a protection output circuit.
[0014] figure 2 It is a specific implementation circuit diagram based on the basic principle of the present invention.
[001...
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The invention discloses an over-current protection self-locking circuit for a photovoltaic inverter. The over-current protection self-locking circuit comprises a protection output circuit, comparison protection is realized by the aid of operational amplifiers, particularly, an in-phase input end and a reverse input end of the first operational amplifier are connected with a first section of an overload reference voltage circuit and a return difference circuit respectively, the return difference circuit is connected between an output end of the first operational amplifier and a detection circuit, the first operational amplifier outputs signals to the protection output circuit, an in-phase input end and a reverse input end of the second operational amplifier are connected with the detection circuit and a second section of the overload reference voltage circuit respectively, output of the second operational amplifier is connected with a one-way high level output circuit, the one-way high level output circuit is connected with a self-locking circuit, and output of the self-locking circuit is connected to the protection output circuit. The over-current protection self-locking circuit is low in cost, high in speed, safe and reliable in control, a final stage load can be effectively prevented from far exceeding a rated output load of the inverter, the output load is prevented from being too high and not eliminated, and burnout of power devices due to repeated restart is avoided.
Description
technical field [0001] The invention relates to a photovoltaic inverter, in particular to an overcurrent protection self-locking circuit of a grid-connected inverter for solar photovoltaic power generation. Background technique [0002] In my country, the photovoltaic power generation system is mainly a DC system, that is, the electric energy generated by the solar cell is used to charge the battery, and the battery directly supplies power to the load. for a direct current system. This type of system is simple in structure and low in cost, but due to different load DC voltages (such as 12V, 24V, 48V, etc.), it is difficult to achieve standardization and compatibility of the system, especially for civilian power, since most of them are AC loads, DC power Photovoltaic power sources for power supply are difficult to enter the market as a commodity. [0003] Inverter (inverter), also known as power regulator, converts DC power (battery, storage battery) into AC power (generally...
Claims
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IPC IPC(8): H02H7/122
Inventor 杜安明
Owner WUXI HODGEN TECH CO LTD