Circuit structure and photovoltaic air conditioning system

Abstract

The invention provides a circuit structure and a photovoltaic air conditioning system. The circuit structure comprises a positive bus, a negative bus, a capacitor, an MOS transistor and a second resistor, and is characterized in that a first end of the positive bus is connected with the positive input, and a second end of the positive bus is connected with the positive output; a first pole plate of the capacitor is connected with the positive bus in parallel through a first resistor, a grid electrode of the MOS transistor is connected with the first pole plate of the capacitor, a source electrode of the MOS transistor is connected with a second pole plate of the capacitor, the second resistor is connected with the source electrode of the MOS transistor and a drain electrode of the MOS transistor in parallel, a first end of the negative bus is connected with the drain electrode of the MOS transistor, and a second end of the negative bus is connected with the negative output. By applyingthe technical scheme of the invention, the effect of inhibiting the startup surge current is achieved, the circuit loss is reduced, and the electromagnetic compatibility of the circuit is improved; and the impact current at the moment of circuit connection is retrained, the impact on the whole power supply is reduced, and the system reliability is improved.

Description

technical field [0001] The invention relates to the technical field of circuit structures, in particular to a circuit structure and a photovoltaic air conditioning system. Background technique [0002] figure 1 It is the schematic diagram of the EMI filter, where L1 and L2 are differential mode inductors, L3 is a common mode inductor, C1 and C2 are differential mode capacitors, and C3 and C4 are common mode capacitors. Due to the existence of large-capacity differential mode filter capacitors C1, C2 and the additional capacitors of the load, at the moment when the load is powered on, C1, C2 and the additional capacitors loaded at the output end of the EMI filter form a low-impedance loop with the power supply. If the rate of change is too large, there is a large inrush current. When the load is running, it is easy to affect the work of other loads of the same power supply, and it is easy to damage the power supply, resulting in large power loss. [0003] In actual use, the...

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Problems solved by technology

[0004] The embodiment of the present invention provides a circuit structure and a photovoltaic air-conditioning system to solve the technical problem of the circuit structure that suppresses the current impact in the prior art that the air switch has a large start-up surge current when it is turned on.

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