CN208285223U - A kind of adjustable high boosting isolated form DC/DC converter of bridge arm number - Google Patents

Abstract

The utility model proposes a kind of adjustable high boosting isolated form DC/DC converters of bridge arm number, contain if setting the adjustable high boosting isolated form DC/DC converter of the bridge arm numbermA bridge arm, then its composition is as follows: a DC input voitage source, 2 input side filter capacitors,mA bridge arm,mA no-load voltage ratio is 1:kHigh frequency transformer, the inverter bridge other end hasnA high boosting gain unit contains 2 in each high boosting gain unitmA capacitor and 2mA diode.Compared to existing bridge-type isolated form DC/DC converter, its bridge arm number is freely adjustable, and the electric current automatic current equalizing of each bridge arm, input and output high gain and adjustable, switching device voltage and current stress are low, and the large capacity promotion that may be applicable to electrical isolation is had a meeting, an audience, etc. well under one's control in conjunction.

Description

A kind of adjustable high boosting isolated form DC/DC converter of bridge arm number

Technical field

The utility model relates to a kind of DC-DC converters, and in particular to a kind of adjustable high boosting isolation of bridge arm number Type DC/DC converter.

Background technique

As the scale of marine wind electric field constantly expands, the promotion of offshore distance, the advantage of direct current confluence and technology of transmission of electricity Gradually show, but the design of high-gain large capacity DC/DC converter is the big bottleneck for restricting offshore wind farm and realizing direct current confluence. Traditional diode bridge rectifier is widely used, but on the one hand its rectifier output voltage is lower, this defeated to marine wind field Enter the more demanding occasion of output voltage gain to be difficult to be competent at, the turn ratio by means of improving transformer is needed to promote entire change The gain of parallel operation.And the design of transformer of the high turn ratio of large capacity is more difficult, limits the development of high power converters.It is another Aspect diode voltage stress is high, and for the DC convergent current bus bar voltage of marine wind electric field usually in 40kV, parts selection is more difficult.

Higher voltage output may be implemented in voltage doubling rectifing circuit at this stage, but is usually used in the application of smaller power grade In occasion, there are problems that diode current stress is excessive and is difficult to design in large capacity application, using multiple inputs It is in parallel and there are power between each phase to be difficult to equilibrium assignment, each device current stress and fever are uneven in system, can It is a greater impact by property and service life.

Summary of the invention

Stream is difficult when In view of the above shortcomings of the prior art, to solve existing voltage doubling rectifing circuit Multiphase Parallel asks Topic, the utility model proposes can automatic current equalizing a kind of adjustable high boosting isolated form DC/DC converter of bridge arm number.

The utility model adopts the following technical solution:

A kind of adjustable high boosting isolated form DC/DC converter of bridge arm number, includes 1 direct-current input power supplying, 2 input sides Filter capacitor C₁、C₂, m inverter bridge leg, each bridge arm includes 2 power switch.Wherein the shared 2m no-load voltage ratio of rectification side is 1: The high frequency transformer of k, n gain unit, 4m output diode D₁、D₂、D₃...D_2m、D₀₁、D₀₂、D₀₃...D_0(2m), 1 defeated Filter capacitor C out₀, 1 load R_L.It wherein include 2m capacitor C in each gain unit₁₁、C₁₂...C_n(2m)With 2m diode D₁₁、D₁₂...D_n(2m).M bridge arm corresponds to 2m input phase, and it is as follows to propose transformation implement body connection type:

Input side filter capacitor C₁Another termination C₂One end, and the tie point is denoted as node 0, C₁One termination DC power supply is just Pole, C₂Another termination DC power cathode.In inverter bridge leg, every 2 power switch form a bridge arm, i.e. S₁₁、S₁₂Constitute the 1st Bridge arm, S₁₁Drain electrode meets positive pole, S₁₁Source electrode meets S₁₂Drain electrode, and the tie point is denoted as node 1, S₁₂Source electrode connects power cathode. S₂₁、S₂₂Constitute Bridge 2 arm, S₂₁Drain electrode meets positive pole, S₂₁Source electrode meets S₂₂Drain electrode, and the tie point is denoted as node 2, S₂₂Source electrode Connect power cathode.And so on S_m1、S_m2Constitute m bridge arm, S_m1Drain electrode meets positive pole, S_m1Source electrode meets S_m2Drain electrode, and the section Point is denoted as node m, S_m2Source electrode connects power cathode.

Inverter bridge leg node 1,2,3...m meet transformer T respectively₁、T₃、T₅...T_2m-1Primary side Same Name of Ends, node 0 connect change Depressor T₂、T₄、T₆...T_2mPrimary side Same Name of Ends, all transformer primary side different name ends are sequentially connected.

The connection type of n gain unit is as follows:

Gain unit 1 is by 2m capacitor C₁₁、C₁₂...C_1(2m), 2m diode D₁₁、D₁₂...D_1(2m)It constitutes, internal junction Diode D in structure₁₁Cathode connect capacitor C₁₁One end, anode connects capacitor C₁₂The other end, diode D₁₂Cathode connect capacitor C₁₂One end, anode connects capacitor C₁₃The other end ... diode D_1(2m-1)Cathode connect capacitor C_1(2m-1)One end, anode even electricity Hold C_1(2m)The other end, diode D_1(2m)Cathode connect capacitor C_1(2m)One end, anode connect capacitor C₁₁The other end.

Gain unit 2 is by 2m capacitor C₂₁、C₂₂...C_2(2m), 2m diode D₂₁、D₂₂...D_2(2m)It constitutes, internal junction Diode D in structure₂₁Cathode connect capacitor C₂₁One end, anode connect capacitor C₂₂The other end, diode D₂₂Cathode connect capacitor C₂₂One End, anode connect capacitor C₂₃The other end ... diode D_2(2m-1)Cathode connect capacitor C_2(2m-1)One end, anode connect capacitor C_2(2m)It is another End, diode D_2(2m)Cathode connect capacitor C_2(2m)One end, anode connect capacitor C₂₁The other end.

And so on arrive gain unit n.

Gain unit n is by 2m capacitor C_n1、C_n2...C_nm, 2m diode D_n1、D_n2...D_n(2m)It constitutes, internal structure Middle diode D_n1Cathode connect capacitor C_n1One end, anode connect capacitor C_n2The other end, diode D_n2Cathode connect capacitor C_n2One end, Anode connects capacitor C_n3The other end ... diode D_n(2m-1)Cathode connect capacitor C_n(2m-1)One end, anode connect capacitor C_n(2m)The other end, Diode D_n(2m)Cathode connect capacitor C_n(2m)One end, anode connect capacitor C_n1The other end.

All Circuit Fault on Secondary Transformer different names end is sequentially connected.Capacitor C in gain unit 1₁₁、C₁₂...C_1(2m)One end difference Meet transformer T₁、T₂...T_2mSecondary side Same Name of Ends, capacitor C in gain unit 2₂₁、C₂₂...C_2(2m)One end connect gain list respectively Capacitor C in member 1₁₁、C₁₂...C_1(2m)The other end, capacitor C in gain unit 3₃₁、C₃₂...C_3(2m)One end connect gain list respectively Capacitor C in member 2₂₁、C₂₂...C_2(2m)The other end ... gain unit n in capacitor C_n1、C_n2...C_n(2m)One end connect gain respectively Capacitor C in unit n-1_(n-1)1、C_(n-1)2...C_(n-1)(2m)The other end, capacitor C in gain unit n_n1、C_n2...C_n(2m)It is another End meets diode D respectively₁、D₂...D_2mCathode, diode D₁、D₂...D_2m, anode meet filter capacitor C₀With load R_LOne End.Filter capacitor C₀With load R_LAnother terminating diode D₀₁、D₀₂...D_0(2m)Cathode, diode D₀₁、D₀₂...D_0(2m)'s Anode meets diode D in gain unit 1 respectively₁₁、D₁₂...D_1(2m)Cathode.

Its control mode: for each switch of the bridge arm subscript tail marked as 1, i.e. S is connected in 0 °~180 ° sections₁₁、 S₂₁...S_m1.Each bridge arm subscript tail is connected marked as 2 switches, i.e. S in 180 °~360 ° sections₁₂、S₂₂...S_m2.Each group is opened Closing conducting, there are enough dead times.

Compared to existing isolated form technology, a kind of adjustable high boosting isolated form DC/DC converter of bridge arm number of the utility model, It has the following beneficial effects:

1, the utility model realizes the boosting output of converter height using multiple gain units, according to demand adjust gain unit Number makes change in gain, has wide range of applications, and is more suitable for large-scale promotion and has a meeting, an audience, etc. well under one's control conjunction, and the transformer of lower no-load voltage ratio can be used Achieve the purpose that high boosting, the design difficulty of transformer substantially reduces.And the converter is compared with prior art, secondary side diode Voltage stress also more reduces.Wherein:

Input and output gain is (zero load):

The voltage stress of diode in gain unit are as follows:

The voltage stress of output diode are as follows:

In formula, u_inFor input voltage, u₀For output voltage, k is primary side the number of turns in transformer secondary turn ratio, and n is gain Unit number, m are inverter bridge leg number.(i=1,2 ..., n；J=1,2 ..., m)

2, since the ampere-second of capacitor balances, each mutually to can be realized automatic current equalizing with each bridge arm, the every phase current of secondary side flows To which primary side flows through the electric current equalization of transformer, the power-sharing of transformer guarantees to flow without any control strategy, with It is compared in such a way that external circuit detection, control are realized and flowed, reduces circuit complexity, circuit heat dissipation is more easily controlled, Cost greatly reduces simultaneously.

3, the converter adapts to bigger high current input according to different applications, the adjustable input number of phases Occasion, capacity increases, and each phase automatic current equalizing.Inverter bridge leg number is adjusted to adjust the input number of phases, the electricity of every phase and diode Stream stress can change accordingly.

Detailed description of the invention

Fig. 1 is the utility model circuit theory total figure

Fig. 2 is the topology of adjustable high boosting isolated form DC/DC converter 2 gain units Han 2 bridge arms of the bridge arm number Figure

Fig. 3 is to flow principle analysis figure

When Fig. 4 is converter m=2, n=2, input voltage u_in, output voltage u₀, capacitor C₁₁、C₁₂、C₂₁、C₂₂Voltage, Inverter bridge leg output voltage u₁Simulation waveform.

When Fig. 5 is converter m=2, n=2, transformer T₁、T₂、T₃、T₄Current simulations waveform diagram.

When Fig. 6 is converter m=2, n=2, diode D₁₁、D₁₂Voltage and current simulation waveform.

When Fig. 7 is converter m=2, n=2, diode D₁、D₂Voltage and current simulation waveform.

Specific embodiment

The utility model is described in further detail with reference to the accompanying drawing.

As shown in Fig. 2, the adjustable high boosting isolated form DC/DC converter of bridge arm number contains opening up for 22 gain units of bridge arm Figure is flutterred, it includes 1 direct-current input power supplying, 2 input side filter capacitor C₁、C₂, 2 tri-level inversion bridge arms, 4 no-load voltage ratios are The high frequency transformer T of 1:k₁、T₂、T₃、T₄, 2 gain units, 8 output diode D₁、D₂、D₃、D₄、D₀₁、D₀₂、D₀₃、D₀₄, 1 A output filter capacitor C₀, 1 load R_L.It wherein include 4 capacitors and 4 diodes in each gain unit.Each inverter bridge Arm includes 2 power switch.The corresponding 4 input phases of 2 bridge arms are specific to connect are as follows:

Input side filter capacitor C₁Another termination C₂One end, and the tie point is denoted as node 0, C₁One termination DC power supply is just Pole, C₂Another termination DC power cathode.In inverter bridge leg, every 2 power switch form a bridge arm, i.e. S₁₁、S₁₂Constitute the 1st Bridge arm, S₁₁Drain electrode meets positive pole, S₁₁Source electrode meets S₁₂Drain electrode, and the tie point is denoted as node 1, S₁₂Source electrode connects power cathode. S₂₁、S₂₂Constitute Bridge 2 arm, S₂₁Drain electrode meets positive pole, S₂₁Source electrode meets S₂₂Drain electrode, and the tie point is denoted as node 2, S₂₂Source electrode Connect power cathode.

Inverter bridge leg node 1,2 meets transformer T respectively₁、T₃Primary side Same Name of Ends, node 0 meet transformer T₂、T₄Primary side Same Name of Ends, all transformer primary side different name ends are sequentially connected.

The connection type of 2 gain units is as follows:

Gain unit 1 is by 4 capacitor C₁₁、C₁₂、C₁₃、C₁₄, 4 diode D₁₁、D₁₂、D₁₃、D₁₄It constitutes, internal structure Middle diode D₁₁Cathode connect capacitor C₁₁One end, anode connects capacitor C₁₂The other end, diode D₁₂Cathode connect capacitor C₁₂ One end, anode connects capacitor C₁₃The other end, diode D₁₃Cathode connect capacitor C₁₃One end, anode connects capacitor C₁₄It is another End, diode D₁₄Cathode connect capacitor C₁₄One end, anode connects capacitor C₁₁The other end.

Gain unit 2 is by 4 capacitor C₂₁、C₂₂、C₂₃、C₂₄, 4 diode D₂₁、D₂₂、D₂₃、D₂₄It constitutes, internal structure Middle diode D₂₁Cathode connect capacitor C₂₁One end, anode connects capacitor C₂₂The other end, diode D₂₂Cathode connect capacitor C₂₂ One end, anode connects capacitor C₂₃The other end, diode D₂₃Cathode connect capacitor C₂₃One end, anode connects capacitor C₂₄It is another End, diode D₂₄Cathode connect capacitor C₂₄One end, anode connects capacitor C₂₁The other end.

All Circuit Fault on Secondary Transformer different names end is sequentially connected.Capacitor C in gain unit 1₁₁、C₁₂、C₁₃、C₁₄One end difference Meet transformer T₁、T₂、T₃、T₄Secondary side Same Name of Ends, capacitor C in gain unit 2₂₁、C₂₂、C₂₃、C₂₄One end connect gain list respectively Capacitor C in member 1₁₁、C₁₂、C₁₃、C₁₄The other end, capacitor C₂₁、C₂₂、C₂₃、C₂₄The other end meet diode D respectively₁、D₂、D₃、D₄ Cathode, diode D₁、D₂、D₃、D₄Anode meet filter capacitor C₀With load R_LOne end.Filter capacitor C₀With load R_LIt is another One terminating diode D₀₁、D₀₂、D₀₃、D₀₄Cathode, diode D₀₁、D₀₂、D₀₃、D₀₄Anode connects diode in gain unit 1 respectively D₁₁、D₁₂、D₁₃、D₁₄Cathode.

2, the high boosting isolated form DC/DC converter of 2 bridge arms, control mode is to be connected in 0 °~180 ° sections Each switch of the bridge arm subscript tail marked as 1, i.e. S₁₁、S₂₁.180 °~360 ° sections be connected each bridge arm subscript tails marked as 2 switches, i.e. S₁₂、S₂₂.There are enough dead times for each group of switch conduction.

According to the difference of power switch state, circuit can be divided into 3 kinds of working conditions:

(1) power switch is turned off, and is at this time dead time, all diodes are turned off, C₁、C₂It neither charges nor puts Electricity；All diodes are turned off.Because dead time is very of short duration, the influence of converter can be ignored not in the analysis process Meter.

(2) controller controls the second power switch S₁₂, the 4th power switch S₂₂Shutdown, the first power switch S₁₁And third Power switch S₂₁Conducting.Capacitor C at this time₁Electric discharge, capacitor C₂Charging.Inverter bridge leg exports positive level, the outflow of input power anode Electric current passes sequentially through switch S₁, node 1, transformer T₁Primary side Same Name of Ends and different name end, transformer T₂Different name end and Same Name of Ends, Node 0 constitutes first side loop.Transformer T₁Secondary side Same Name of Ends generates electric current and passes through D₁₁Give capacitor C₁₂Charging, gives Capacitor C₁₁Electric discharge, electric current pass through diode D₂₁To capacitor C₂₂Capacitor C is given in charging₂₁Electric discharge, electric current pass through diode D₁To load R_LPower supply, electric current flow through load and pass through diode D₀₂Inflow transformer T₂Secondary side Same Name of Ends forms first secondary side circuit, With transformer T₂Primary side current direction is consistent.Similarly the positive electrode current of input power passes sequentially through switch S₃, node 2, transformer T₃ Primary side Same Name of Ends and different name end, transformer T₄Different name end and Same Name of Ends, node 0 constitute side loop of Article 2.Transformer T₃ Secondary side Same Name of Ends generates electric current and passes through diode D₁₃Give capacitor C₁₄Capacitor C is given in charging₁₃Electric discharge, electric current pass through diode D₂₃ To capacitor C₂₄Charging；Give capacitor C₂₃Electric discharge, electric current pass through diode D simultaneously₃To load R_LPower supply, electric current flow through load by two Pole pipe D₀₄Inflow transformer T₄Secondary side Same Name of Ends forms Article 2 secondary side circuit, with transformer T₄Primary side current direction one It causes.Diode D at this time₂、D₄、D₀₁、D₀₃、D₁₂、D₁₄、D₂₂、D₂₄It is turned off.

(3) controller controls the first power switch S₁₁, third power switch S₂₁Shutdown, the second power switch S₁₂With the 4th Power switch S₂₂Conducting.Capacitor C at this time₁Charging, capacitor C₂Electric discharge.Inverter bridge leg exports negative level, capacitor C₂Discharge current is successively Pass through node 0, transformer T₂Primary side Same Name of Ends and different name end, transformer T₃Primary side different name end and Same Name of Ends, node 2, switch S₂₂Constitute first side loop.Transformer T₂Secondary side Same Name of Ends generates electric current and passes through D₁₂Give capacitor C₁₃Charging, to electricity Hold C₁₂Electric discharge, electric current pass through diode D₂₂To capacitor C₂₃Capacitor C is given in charging₂₂Electric discharge, electric current pass through diode D₂To load R_L Power supply, electric current flow through load and pass through diode D₀₃Inflow transformer T₃Secondary side Same Name of Ends forms first secondary side circuit, with Transformer T₃Primary side current direction is consistent.Similarly capacitor C₂Discharge current passes sequentially through node 0, transformer T₄Primary side is of the same name End and different name end, transformer T₁Primary side different name end and Same Name of Ends, node 1, switch S₁₂Constitute side loop of Article 2.Transformation Device T₄Secondary side Same Name of Ends generates electric current and passes through diode D₁₄Give capacitor C₁₁Capacitor C is given in charging₁₄Electric discharge, electric current pass through two poles Pipe D₂₄To capacitor C₂₁Charging；Give capacitor C₂₄Electric discharge, electric current pass through diode D simultaneously₄To load R_LPower supply, it is logical that electric current flows through load Cross diode D₀₁Inflow transformer T₁Secondary side Same Name of Ends forms Article 2 secondary side circuit, with transformer T₁Primary side current side To consistent.Diode D at this time₁、D₃、D₀₂、D₀₄、D₁₁、D₁₃、D₂₁、D₂₃It is turned off.

Simulation parameter: switching frequency f=50kHz, input voltage u_in=400V, output voltage u₀=600V, rated power P₀=4800W, transformer voltage ratio k=1.It is input voltage u from Fig. 4_in, output voltage u₀Inverter bridge leg output voltage u₁And capacitor C₁₁、C₁₂、C₂₁、C₂₂Voltage, it can be seen that as input voltage u_inWhen the direct current of=400V, inverter bridge leg exports u₁For amplitude The ac square wave of 200V, totally two kinds of level, the output DC voltage u rectified by rear class₀=600V is the 3 of alternating current amplitude Times.It is inflow transformer T from Fig. 5₁、T₂、T₃、T₄Electric current, it can be seen that the electric current for flowing through 4 transformers is equal, and power is equal Point, all phase automatic current equalizings.Fig. 5 is diode D₁₁、D₁₂Voltage and current waveform.Fig. 6 is diode D₁、D₂Voltage and electricity Flow waveform.

Flow principle:

By taking 1 gain unit in Fig. 3 as an example.When stable state, t₀Moment, inverter bridge leg output voltage u_inIt equivalent can become one Square-wave AC Power Source is begun to ramp up from negative level to positive level, since the rate of climb is very fast, it is believed that capacitor C₁₁、C₁₃It opens Begin electric discharge at the time of with capacitor C₁₂、C₁₄It is consistent at the time of starting to charge.Diode D at this time₁₁、D₁₃、D₁、D₃、D₀₂、D₀₄Conducting, such as Fig. 3, this moment, u_c11=u_c13=u₀-u_in, u_c12=u_c14=u_in。t₁Moment (very fast to reach), capacitor C₁₁、C₁₃Voltage Start slowly decline, capacitor C₁₂、C₁₄Voltage starts slowly to rise, and voltage change speed is very slow.t₂Moment, at this time u_c11、 u_c12、u_c13、u_c14Variable quantity be enough to make diode D₁、D₁₁、D₃、D₁₃Shutdown.All diode shutdowns, capacitor charge and discharge Terminate.U in this period_inAnd u₀Remain constant, under each module parameter unanimous circumstances, then the voltage on capacitor It remains unchanged, capacitor C₁₁、C₁₃Initial discharge moment and capacitor C₁₂、C₁₄The initiation of charge moment is consistent, as long as holding capacitor capacitance phase Deng the speed of voltage change is maintained for unanimously on that capacitor, C₁₁、C₁₃Discharge finish time and C₁₂、C₁₄Charging finishing time also one It causes.Since the capacitor charge and discharge quantity of electric charge balances in a cycle, it can be deduced that every quantity of electric charge all the way is consistent in a cycle , then every electric current all the way is equal, thus releases every phase automatic current equalizing.u_inIt is similar with positive level when for negative level.

It is similar that gain unit increases to n analysis situation.

Claims (1)

1. a kind of adjustable high boosting isolated form DC/DC converter of bridge arm number, it is characterised in that: it include 1 direct-current input power supplying, 2 input side filter capacitorsC ₁、C ₂,mA inverter bridge leg, each bridge arm include 2 power switch；Wherein rectification side shares 2m A no-load voltage ratio is 1:kHigh frequency transformer,nA gain unit, 4mA output diode D₁、D₂、D₃...D_2m 、D₀₁、D₀₂、 D₀₃...D_0(2m), 1 output filter capacitorC ₀, 1 loadR _L ；It wherein include 2 in each gain unitmA capacitorC ₁₁、C _12...C _n(2m)With 2mA diode D₁₁、D_12...D _n(2m)；mA bridge arm corresponding 2mA input phase mentions transformation implement body connection side Formula is as follows:

Input side filter capacitorC ₁Another terminationC ₂One end, and the tie point is denoted as node 0,C ₁One termination DC power anode,C ₂ Another termination DC power cathode；In inverter bridge leg, every 2 power switch form a bridge arm, i.e. S₁₁、S₁₂Constitute Bridge 1 Arm, S₁₁Drain electrode meets positive pole, S₁₁Source electrode meets S₁₂Drain electrode, and the tie point is denoted as node 1, S₁₂Source electrode connects power cathode；S₂₁、 S₂₂Constitute Bridge 2 arm, S₂₁Drain electrode meets positive pole, S₂₁Source electrode meets S₂₂Drain electrode, and the tie point is denoted as node 2, S₂₂Source electrode connects Power cathode；And so on S _m1、S _m2Constitute themBridge arm, S _m1Drain electrode meets positive pole, S _m1Source electrode meets S _m2Drain electrode, and the node It is denoted as nodem, S _m2Source electrode connects power cathode；

Inverter bridge leg node 1,2,3...mTransformer T is met respectively₁、T₃、T₅...T_2m-1Primary side Same Name of Ends, node 0 connect transformer T₂、T₄、T₆...T_2m Primary side Same Name of Ends, all transformer primary side different name ends are sequentially connected；

nThe connection type of a gain unit is as follows:

Gain unit 1 is by 2mA capacitorC ₁₁、C ₁₂...C _1(2m), 2mA diode D₁₁、D₁₂...D_1(2m)It constitutes, in internal structure Diode D₁₁Cathode connect capacitorC ₁₁One end, anode connects capacitorC ₁₂The other end, diode D₁₂Cathode connect capacitorC ₁₂'s One end, anode connect capacitorC ₁₃The other end ... diode D_1(2m-1)Cathode connect capacitorC _1(2m-1)One end, anode connects capacitorC _1(2m)The other end, diode D_1(2m)Cathode connect capacitorC _1(2m)One end, anode connect capacitorC ₁₁The other end；

Gain unit 2 is by 2mA capacitorC ₂₁、C ₂₂...C _2(2m), 2mA diode D₂₁、D₂₂...D_2(2m)It constitutes, in internal structure Diode D₂₁Cathode connect capacitorC ₂₁One end, anode connect capacitorC ₂₂The other end, diode D₂₂Cathode connect capacitorC ₂₂One end, sun Pole connects capacitorC ₂₃The other end ... diode D_2(2m-1)Cathode connect capacitorC _2(2m-1)One end, anode connect capacitorC _2(2m)The other end, two Pole pipe D_2(2m)Cathode connect capacitorC _2(2m)One end, anode connect capacitorC ₂₁The other end；

And so on arrive gain unitn；

Gain unitnBy 2mA capacitorC _n1、C _n2...C _nm , 2mA diode D _n1、D _n2...D _n(2m)It constitutes, two in internal structure Pole pipe D _n1Cathode connect capacitorC _n1One end, anode connect capacitorC _n2The other end, diode D _n2Cathode connect capacitorC _n2One end, anode Even capacitorC _n3The other end ... diode D _n(2m-1)Cathode connect capacitorC _n(2m-1)One end, anode connect capacitorC _n(2m)The other end, two poles Pipe D _n(2m)Cathode connect capacitorC _n(2m)One end, anode connect capacitorC _n1The other end；

All Circuit Fault on Secondary Transformer different names end is sequentially connected；Capacitor in gain unit 1C ₁₁、C ₁₂...C _1(2m)One end connect change respectively Depressor T₁、T₂...T_2m Secondary side Same Name of Ends, capacitor in gain unit 2C ₂₁、C ₂₂...C _2(2m)One end connect gain unit 1 respectively Middle capacitorC ₁₁、C ₁₂...C _1(2m)The other end, capacitor in gain unit 3C ₃₁、C ₃₂...C _3(2m)One end connect gain unit 2 respectively Middle capacitorC ₂₁、C ₂₂...C _2(2m)The other end ... gain unitnMiddle capacitorC _n1、C _n2...C _n(2m)One end connect gain list respectively MembernCapacitor in -1C _(n-1)1、C _(n-1)2...C _(n-1)(2m)The other end, gain unitnMiddle capacitorC _n1、C _n2...C _n(2m)The other end Diode D is met respectively₁、D₂...D_2m Cathode, diode D₁、D₂...D_2m,Anode connect filter capacitorC ₀And loadR _L One end； Filter capacitorC ₀And loadR _L Another terminating diode D₀₁、D₀₂...D_0(2m)Cathode, diode D₀₁、D₀₂...D_0(2m)Sun Pole meets diode D in gain unit 1 respectively₁₁、D₁₂...D_1(2m)Cathode.