How PV Inverters Work

1. Fully-controlled inverter working principle: The main circuit of the full-bridge inverter with single-phase output is usually used, and the AC components are IGBTs Q11, Q12, Q13, and Q14. PWM pulse width modulation controls the on or off of the IGBT.

When the inverter circuit is connected to the DC power supply, it is first turned on by Q11 and Q14, and Q1 and Q13 are cut off. Then the current is output from the positive side of the DC power supply. After Q11, L or inductance, the primary coil of the transformer is shown in Figure 1-2, and it returns to Q14. To the negative power supply. When Q11 and Q14 are turned off, Q12 and Q13 are turned on. The current flows from the positive terminal of the power supply to the negative terminal of the power supply through Q13 and the transformer primary winding 2-1 inductor to Q12. At this time, positive and negative alternating square waves have been formed on the primary coil of the transformer. Using high-frequency PWM control, the two pairs of IGBT tubes are alternately repeated to generate an alternating voltage on the transformer. Due to the LC filter, the output forms a sine wave AC voltage.

When Q11 and Q14 are turned off, in order to release stored energy, the diodes D11 and D12 are connected in parallel at the IGBT to return the energy to the DC power supply.

2. Working principle of semi-controlled inverter: semi-controlled inverter uses thyristor components. Th1 and Th2 are thyristors that work alternately. When Th1 is triggered to conduct first, the current flows through the transformer through Th1. At the same time, the commutation capacitor C is charged to a 2 times larger power supply voltage due to the inductance of the transformer. When Th2 is triggered to conduct, the anode of Th2 is reverse-biased and Th1 is turned off, returning to the blocking state. In this way, Th1 and Th2 are commutated, and then capacitor C is charged in reverse polarity. In this way, the thyristors are triggered alternately and the current flows alternately to the primary of the transformer and AC is obtained in the secondary of the transformer.

In the circuit, the inductor L can limit the discharge current of the commutation capacitor C, extend the discharge time, ensure that the circuit turn-off time is longer than the turn-off time of the thyristor, and does not require a large-capacity capacitor. D1 and D2 are two feedback diodes, which can release the energy in the inductance L and send the remaining energy back to the power supply to complete the energy feedback.

Product introduction

This product is a kind of specialty ester with high quality, high point point, low pour point, anti-coking, carbon accumulation resistance, environment friendly. It can solely blended with other synthetic material, also can be used with PAO and mineral Base Oil. 

Product Specifications

Application and recommended treat rate

Air Compressor Oil    75% max

Features

Good solubility with additive. Increase oil polarity.

Increse oil affinity for metals.

Can be used as Friction Improver with good anti-friction performance.

Anti-coking and carbon accumulation resistance. High thermal oxidant stability.

High flash point and low volatility. Excellent low temperature performance.

High viscosity index. Good demulsification performance.

Good hydrolytic stability. It is biodegradable.

Package, storage and transportation

Packaged in plastic drum, N.W. 200KGS/drum. Stored and transported as non-dangerous goods, stored in cool, dry and ventilated place.

Base Oil For Air Compressor Oil

Air Compressor Oil,Base Oil For Air Compressor Oil,Air Compressor Base Oil,Synthetic Specialty Base Oil

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