[introduction]In single-phase small-power smooth hot season and in network system, have segregation model attack with two kinds of blame segregation develop structure. Segregation have cost tall, volume is large wait for a lot of defect, because this is not segregation model become at present the develop of the mainstream attacks structure, the article basically introduces blame segregation model complete bridge and HERIC two kinds of relatively commonly used develop attack structure.

In single-phase small-power smooth hot season and in network system, have segregation model attack with two kinds of blame segregation develop structure. Segregation have cost tall, volume is large wait for a lot of defect, because this is not segregation model become at present the develop of the mainstream attacks structure, the article basically introduces blame segregation model complete bridge and HERIC two kinds of relatively commonly used develop attack structure.

In be not system of segregation smooth hot season, direct electric link exists between electrified wire netting and array of smooth hot season. Be listed as a result of smooth Fu Zhen and right stray capacitance exists between ground connection crust, become and exist when movement of parts of an apparatus of net inverter power in all modular voltage, may have then in all modular electric current has shed parasitism capacitance. In all the addition that modular electric current can cause loss not only also can cause safe problem at the same time, national level is opposite and of network system in all modular electric current has strict restriction. Because of the discussion below this from in all modular voltage begins.

In all the generation of modular voltage and definition

Graph the 1 complete bridge that is a model attacks without transformer develop knot composition of a picture, the Cp in the graph lists right parasitism capacitance for smooth Fu Zhen, basis in all equation of modular loop voltage can calculate piece in all modular voltage:

The UA0 in type orders pair of dc generator for A on the voltage value of 0 potential.

Had shed parasitism capacitance in all modular electric current:

Ug is voltage of electrified wire netting of labour frequency 50Hz, and UA0, UB0 is high frequency signal, because this is on the project in all modular voltage can simplify for:

To restrain in all modular electric current, the method that uses normally is to maintain in all modular tension is constant.

Graph 1. Complete bridge construction and in all modular voltage analysis

Complete bridge develop attacks structure

Complete bridge construction uses sheet normally polarity and bipolar means of two kinds of modulation, as a result of adoption control strategy differs, in all modular voltage is different also. See way of odd polarity modulation above all, its control a principle to if the graph is shown 2 times,pursue, in electric current half-period, s4 keeps enlightened all the time, s1, s2 is complementary guide; And the negative half-period in electric current, s3 is enlightened all the time, s1, s2 is complementary guide. Below with half-period is an analysis its in all modular voltage.

When S1, when S4 is enlightened, if A place is shown, electric current from PV-S1-L1-L2-S4-PV, in all modular voltage is Ucm=Udc/2; Close when S1, s2, when S4 is enlightened, be in condition of follow on current, if B place shows electric current from L1-L2-S4-D2, in all modular voltage is Ucm=0, . Can see in odd polarity modulation, in all modular voltage is in 0 and change between Udc/2, in the system the meeting in moving process arises in all modular electric current.

Graph 2. Odd polarity modulation in all modular voltage analysis

To bipolar modulation, 4 power switch is high frequency switch, s1/S4 of bridge arm diagonal and S2/S3 part complementary guide. When S1, s4 guides when connecting, in all modular voltage computation and odd polarity modulation are same, ucm=Udc/2. Close S2/S3 to debut when S1/S4, the method of the electric current when be in condition of follow on current is L1-L2-D3-D2-L1, right now in all modular voltage is Ucm=Udc/2. Because this can see,be in bipolar in modulation, in all modular voltage keeps constant, in all modular electric current got be inhibitioned effectively.

But bipolar in modulation, 4 power switch uses high frequency modulation, modulation of odd polarity of its loss ratio is big, additional on one hand bipolar communication of the output in modulation carries voltage to be mixed in Udc – change between Udc, and the output in odd polarity modulation carries voltage to be in 0 to Udc or 0 to – change between Udc, if use,reduce voltaic ripple bipolar modulation needs bigger filter.

HERIC develop attacks structure

Because afore-mentioned complete bridge constructions have the drawback on a few application, the scientist puts forward famous HERIC circuit, increased T5/D5 of 4 power parts of an apparatus from circuit structure, t6/D6. Because electric current is in axle shaft and semmetry of job of negative axle shaft, analyse only here axle shaft operating mode. It is in electric current when, t6 keeps enlightened, when T1/T4 synchronism is enlightened, electric current has shed T1-L1-L2-T4-T1, in T1, t4 closes bring up the rear, loop of follow on current passes T6, d5, and do not pass dc bus bar. Changeless Ucm=Udc/2 maintains in voltage of model of the Communist Party of China of whole moving process. Because this HREIC circuit can be restrained not only in all modular electric current and voltaic ripple small, efficiency is tall, become without transformer single-phase light bend over and the main develop of network system attacks structure.

Graph 3.HERIC develop attacks graph

Use chart finally simple brief summary actor defect of these 3 kinds of structures, can see HERIC assembled both advantage, in small-power can get applied extensively in application too.

 (Author: Yang Yong, origin: Semiconductor of Ying Feiling industry)

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