Photovoltaic inverter power board light pole equipment principle of work

1, all control inverter working principle: output for the commonly used single phase full bridge inverter main circuit solar energy street lamp, communication components using IGBT tube Q11, Q12, Q13, Q14 during April 12-15. And controlled by the PWM pulse width modulation IGBT tube conduction or deadline. When photovoltaic inverter board



1, all control type inverter working principle: output for the commonly used single phase full bridge inverter main circuit solar energy street lamp, communication components using IGBT tube Q11, Q12, Q13, Q14 during April 12-15. And by the PWM 【 Pulse width modulation ( 脉宽调制) Is the use of the microprocessor digital output to analog circuits to control a very effective technology, widely used in from measurement, communication to power control and transform in many areas. 】 Pulse width modulation ( Pulse width modulation ( 脉宽调制) Is English 'Pulse Width Modulation' abbreviation, referred to as 'Pulse Width Modulation, is the use of the microprocessor digital output to analog circuits to control a very effective technology, widely used in from measurement, communication to power control and - maikuandiaozhi】 Control the conduction of IGBT tube' Conduction is refers to the low resistance to flow through valve or arm forward current state. 】 Or deadline.

when photovoltaic inverter circuit board when dc power supply is connected, first by the Q11, Q14 during April 12-15 conduction, Q1, Q13 cut-off, then the positive output current by the dc power supply, the Q11, L, or feeling, figure 1 - transformer primary winding 2, the cathode to the Q14 during April 12-15 back to power. When the end of the Q11, Q14 during April 12-15, Q12, Q13 conduction, current from positive Q13, 2 - transformer primary winding 1 electric feel negative Q12 returned to power. At this point, on the transformer primary winding, has formed the positive and negative alternating square-wave, using high frequency PWM control, two alternating repetition of IGBT tubes, produce ac voltage on the transformer. Filter by LC to communicate' In HVDC system, in order to filter out harmonic dc control system to produce to avoid adverse influence on the ac transmission system, and compensation dc control system of reactive power consumption at the same time, in the process of dc system must be put into a certain number of ac filter ( Must be minimal number of sets of ac filter operation mode) 。 】 The effect, make the output end to form sine wave ac voltage.

when Q11, Q14 during April 12-15 shut off, in order to release the stored energy in the IGBT parallel diode D11, D12 【 D12 the hip - the United States Hop band from Detroit, Michigan, due to their association with the popular of Eminem, make benefit from the band, Eminem had promised to from their own full-fledged round to personal career and his recording these old songs. 】 , make the energy back into the dc power supply.

2, photovoltaic panel type half controlled inverter working principle: half controlled type inverter adopts thyristor components. Th1, Th2 work for alternating thyristor, a Th1 trigger conduction first, the current through the transformer through the Th1, at the same time due to the effect of induction of the transformer, commutation capacitor C is charging voltage of power supply to big 2 times. According to their Th2 triggered conduction, because of the Th2 anode reverse bias, Th1 cut-off, return to the blocking state. In this way, Th1 and Th2 converter, and then charging capacitor C and reverse polarity. So touch hair crystal thyratron alternately, alternating current flow to the primary transformer, in the transformer secondary alternating current.

in the circuit, the discharge current of the inductor L can restrict the commutation capacitance C, extend the time of discharge, ensure the circuit is greater than the cut-off time of thyristor turn-off time, large capacitor without capacity. D1 and D2 are two feedback diode, inductance L of energy can be released, will the reversing of the remaining energy back to the power supply, complete energy feedback effects.