CN205212725U - Five level transmitting circuits in transient electromagnetic method electrical property source - Google Patents

Abstract

The utility model relates to a five level transmitting circuits in transient electromagnetic method electrical property source is connected with the earth load through three controllable rectifier circuit, DCDC and five level transmission bridge by control and protection circuit, and five level transmission bridge is through drive and protection circuit, combiner circuit and frequency dividing circuit and reference frequency production circuit connection, the combiner circuit respectively with rising edge control circuit, falling edge control circuit, comment a control circuit and synchronous circuit connection constitution. Every power device bore in the circuit ceiling voltage is direct current busbar voltage's fourth, five level topologys of modified with catching diode's voltage clamp system within single level, solved many level output catching diode backward recovery problem. All keep 8 MOSFET pipes to open when exporting any level in the circuit, 8 OSFET pipes turn -off, switch between the adjacent level and only switch 2 MOSFET pipes, guaranteed good stability. It has less dvdt to compare with the existing equipment, has reduced insulating impact and electromagnetic interference.

Description

Transient electromagnetic method grounded source five level emission circuit

Technical field

The utility model relates to the electrical survey (-ing) instrument in a kind of transient electromagnetic, especially the radiating circuit of the high power IP detection instrument of high-voltage high-frequency rate.

Background technology

The principle of transient electromagnetic detecting is the magnetic field by the formation and modification in the earth by grounded source or magnetic source, and the secondary field gone out by the magnetic field induction of this change calculates the parameters such as the resistivity of underground medium, reaches the object determining underground structure.The general intensity with transmitting of the degree of depth of transient electromagnetic detecting is proportionate, and emitting voltage is higher, and its investigation depth is darker.And its detection accuracy and the frequency transmitted are proportionate, emission signal frequency is stronger, and its geologic structure detected is more accurate.

In current transient electromagnetic detecting instrument, the bipolar square wave that its supply power mode produces mainly with DC power supply inversion is greatly as input signal, and the magnetic field of change produced by it or electric field excite the generation of secondary field.The main devices of its inverter circuit selects MOSFET and IGBT.Wherein can to bear voltage higher for IGBT, but turn-off time comparatively MOSFET pipe range, mainly application in high voltage, the detection of high-power, low-frequency grounded source; And MOSFET pipe can bear voltage comparatively IGBT is low, but on the turn-off time, there is obvious advantage compared to IGBT, MOSFET pipe, so it is mainly used in low-voltage, big current, the detection of high-frequency magnetic source.And the high-precision detection of high depth is produced in high-voltage high-frequency rate field, be the difficult point of current transient electromagnetic detecting instrument.

The power component series connection adopted in power electronic technology at present uses, and because it is difficult to the balance of voltage on the power device of each series connection of guarantee, more easily causes the damage of device, so be difficult to apply in the detection instrument that cost is higher.And the power component series connection proposed recently uses Phase Shift Control Study, because its main circuit is complicated, realize access and the classification of main power source, on detection instrument, application can increase its volume to a great extent, and when severe operational environment less stable, so be difficult to extensively be promoted.

CN103973147A discloses one " multi-level high-voltage grounded source electromagnetic emission circuit ", and it adopts comparatively simple multi-level control strategies effectively the voltage on IGBT to be reduced to 1/2nd of DC bus-bar voltage, achieves obvious effect in boosting; But detect up to compared with the 1500V even voltage of 2000V with grounded source, its reduce by half after the frequency of switching device still do not have obvious lifting.Meanwhile, the three level launch scenario that it adopts fails to solve very well in the dividing potential drop problem of clamp diode, is unfavorable for the choice and utilization of device in specific embodiments.

Summary of the invention

The utility model is for above-mentioned the deficiencies in the prior art, provides a kind of high-voltage high-frequency rate transient electromagnetic method grounded source five level emission circuit be simultaneously suitable in time-domain and frequency domain.Key property is that very high the making of the output frequency of circuit still can keep high-tension output, solves spread voltage problem on clamp diode.

The purpose of this utility model is achieved through the following technical solutions:

Transient electromagnetic method grounded source five level emission circuit; by to control and protective circuit is connected with earth load with five level emission bridge roads through three controlled rectification circuits, DC/DC; five level emission bridge roads produce circuit through driving and protective circuit, combiner circuit and frequency dividing circuit with reference frequency and are connected, and combiner circuit connects and composes with rising edge control circuit, trailing edge control circuit, flat-top control circuit and synchronous circuit respectively.

Five-level high-voltage HF-electromagnetism radiating circuit, this circuit exports in unipolarity, is divided into five level, four identical direct voltage E ₁, E ₂, E ₃, E ₄earth load is connected to by many level loop.

Five level emission bridge routes, 16 MOSFET (S ₁, S ₂, S ₃, S ₄, S ₅, S ₆, S ₇, S ₈, S ₉, S ₁₀, S ₁₁, S ₁₂, S ₁₃, S ₁₄, S ₁₅, S ₁₆), 16 fly-wheel diode (VD ₁, VD ₂, VD ₃, VD ₄, VD ₅, VD ₆, VD ₇, VD ₈, VD ₉, VD ₁₀, VD ₁₁, VD ₁₂, VD ₁₃, VD ₁₄, VD ₁₅, VD ₁₆), 22 reverse parallel connection clamp diode (D ₁, D ₂, D ₃, D ₄, D ₅, D ₆, D ₇, D ₈, D ₉, D ₁₀, D ₁₁, D ₁₂, D ₁₃, D ₁₄, D ₁₅, D ₁₆, D ₁₇, D ₁₈, D ₁₉, D ₂₀, D ₂₁, D ₂₂) composition.

Power supply E1, E2, E3, E4 first connect, and then in parallel with five level emission bridge roads.Many level emission bridge road is divided into four brachium pontis, and each brachium pontis is divided into four switching device MOSFET and four reverse fly-wheel diode VD to form: S in the first brachium pontis ₁with VD ₁parallel connection, S ₂with VD ₂parallel connection, S ₃with VD ₃parallel connection, S ₄with VD ₄parallel connection, then four is composed in series the first brachium pontis, wherein S successively ₁with S ₂tie point is designated as F ₁, S ₂with S ₃tie point is designated as F ₂, S ₃with S ₄tie point is designated as F ₃; S in second brachium pontis ₅with VD ₅parallel connection, S ₆with VD ₆parallel connection, S ₇with VD ₇parallel connection, S ₈with VD ₈parallel connection, then four is composed in series the second brachium pontis, wherein S successively ₅with S ₆tie point is designated as F ₄, S ₆with S ₇tie point is designated as F ₅, S ₇with S ₈tie point is designated as F ₆; S in 3rd brachium pontis ₉with VD ₉parallel connection, S ₁₀with VD ₁₀parallel connection, S ₁₁with VD ₁₁parallel connection, S ₁₂with VD ₁₂parallel connection, then four is composed in series the 3rd brachium pontis, wherein S successively ₉with S ₁₀tie point is designated as F ₇, S ₁₀with S ₁₁tie point is designated as F ₈, S ₁₁with S ₁₂tie point is designated as F ₉; S in four bridge legs ₁₃with VD ₁₃parallel connection, S ₁₄with VD ₁₄parallel connection, S ₁₅with VD ₁₅parallel connection, S ₁₆with VD ₁₆parallel connection, then four is composed in series four bridge legs, wherein S successively ₁₃with S ₁₄tie point is designated as F ₁₀, S ₁₄with S ₁₅tie point is designated as F ₁₁, S ₁₅with S ₁₆tie point is designated as F ₁₂.

Power supply power supply E ₁, E ₂, E ₃, E ₄its magnitude of voltage is identical, is E, connects successively in order.Wherein E ₁positive pole be designated as O ₀, E ₁with E ₂tie point be designated as O ₁, E ₂with E ₃tie point be designated as O ₂, E ₃with E ₄tie point be designated as O ₃, E ₄negative pole be designated as O ₄.Clamp diode D ₁, D ₂, D ₃, D ₄, D ₅, D ₆f is parallel in order after differential concatenation ₁with F ₆two ends, wherein D ₁with D ₂tie point be designated as M ₁, D ₂with D ₃tie point be designated as M ₂, D ₃with D ₄tie point be designated as M ₃, D ₄with D ₅tie point be designated as M ₄, D ₅with D ₆tie point be designated as M ₆.Clamp diode D ₇, D ₈, D ₉, D ₁₀f is parallel in order after differential concatenation ₂with F ₅two ends, wherein D ₇with D ₈tie point be designated as M ₆, D ₈with D ₉tie point be designated as M ₇, D ₉with D ₁₀tie point be designated as M ₈.Clamp diode D ₁₁, D ₁₂f is parallel in order after differential concatenation ₃with F ₄two ends, D ₁₁with D ₁₂tie point be designated as M ₉.

Clamp diode D ₁₃, D ₁₄, D ₁₅, D ₁₆, D ₁₇, D ₁₈f is parallel in order after differential concatenation ₇with F ₁₂two ends, wherein D ₁₃with D ₁₄tie point be designated as M ₁₀, D ₁₄with D ₁₅tie point be designated as M ₁₁, D ₁₅with D ₁₆tie point be designated as M ₁₂, D ₁₆with D ₁₇tie point be designated as M ₁₃, D ₁₇with D ₁₈tie point be designated as M ₁₄.Clamp diode D ₁₉, D ₂₀, D ₂₁, D ₂₂f is parallel in order after differential concatenation ₈with F ₁₁two ends, wherein D ₁₉with D ₂₀tie point be designated as M ₁₅, D ₂₀with D ₂₁tie point be designated as M ₁₆, D ₂₁with D ₂₂tie point be designated as M ₁₇.Clamp diode D ₂₃, D ₂₄f is parallel in order after differential concatenation ₉with F ₁₀two ends, D ₂₃with D ₂₄tie point be designated as M ₁₈.

The connected mode of above-mentioned various piece is as follows: O ₁with M ₁, O ₁with M ₁₀, O ₂with M ₃, O ₂with M ₁₂, O ₃with M ₅, O ₃with M ₁₄all directly connected by wire.M ₂with M ₆, M ₄with M ₈, M ₇with M ₉all directly connected by wire.M ₁₁with M ₁₅, M ₁₃with M ₁₇, M ₁₆with M ₁₈all directly connected by straight wire.First brachium pontis is connected with the second brachium pontis, and its tie point is A.3rd brachium pontis is connected with four bridge legs, and its tie point is B.Be in parallel with power supply after this two parts tandem construction parallel, form five level emission loops.Earth load is connected on A, between B

R is the earth equivalent resistance, and L is the equivalent inductance of earth lead.

Choose E ₂with E ₃the O of tie point ₂as 0 potential point, then O ₀current potential is 2E, O ₁current potential is E, O ₃current potential is-E, O ₄current potential is-2E.

In this kind of multi-level control strategies, AB point-to-point transmission co-exists in nine kinds of magnitudes of voltage.

S on (1) first brachium pontis and the second brachium pontis ₃, S ₄, S ₅, S ₆open-minded, S ₁, S ₂, S ₇, S ₈turn off, A point current potential is through route D ₃, D ₇, S ₃, S ₄and D ₄, D ₁₀, S ₅, S ₆with O ₂point connects, and its current potential is 0 current potential; S on 3rd brachium pontis and four bridge legs ₁₁, S ₁₂, S ₁₃, S ₁₄open-minded, S ₉, S ₁₀, S ₁₅, S ₁₆turn off, B point current potential is also 0, and now between AB, voltage is 0.

S on (2) first brachium pontis and the second brachium pontis ₂, S ₃, S ₄, S ₅open-minded, S ₁, S ₆, S ₇, S ₈turn off, through route D ₁, S ₂, S ₃, S ₄and D ₂, D ₈, D ₁₂, S ₅, make A point current potential and O ₁identical, its current potential is E; S on 3rd brachium pontis and four bridge legs ₁₁, S ₁₂, S ₁₃, S ₁₄open-minded, S ₉, S ₁₀, S ₁₅, S ₁₆turn off, B point current potential is still 0.Now between AB, voltage is E.

S on (3) first brachium pontis and the second brachium pontis ₂, S ₃, S ₄, S ₅open-minded, S ₁, S ₆, S ₇, S ₈turn off, A point current potential is E.S on 3rd brachium pontis and four bridge legs ₁₂, S ₁₃, S ₁₄, S ₁₅open-minded, S ₉, S ₁₀, S ₁₁, S ₁₆turn off, through route D ₁₇, D ₂₁, D ₂₃, S ₁₂and S ₁₃, S ₁₄, S ₁₅, D ₁₈, make B point obtain-E current potential identical with O3 point.Now between AB, voltage is 2E.

S on (4) first brachium pontis and the second brachium pontis ₁, S ₂, S ₃, S ₄open-minded, S ₅, S ₆, S ₇, S ₈turn off, A point is through S ₁, S ₂, S ₃, S ₄connect and O ₀point obtains identical current potential 2E.S on 3rd brachium pontis and four bridge legs ₁₂, S ₁₃, S ₁₄, S ₁₅open-minded, S ₉, S ₁₀, S ₁₁, S ₁₆turn off, B point current potential is-E.Now between AB, voltage is 3E.

S on (5) first brachium pontis and the second brachium pontis ₁, S ₂, S ₃, S ₄open-minded, S ₅, S ₆, S ₇, S ₈turn off, A point is through S ₁, S ₂, S ₃, S ₄connect and O ₀point obtains identical current potential 2E.S on 3rd brachium pontis and four bridge legs ₁₃, S ₁₄, S ₁₅, S ₁₆open-minded, S ₉, S ₁₀, S ₁₁, S ₁₂turn off, B point is through S ₁₃, S ₁₄, S ₁₅, S ₁₆connect and O ₄point obtains identical current potential-2E.Now between AB, voltage is 4E.

S on (6) first brachium pontis and the second brachium pontis ₃, S ₄, S ₅, S ₆open-minded, S ₁, S ₂, S ₇, S ₈turn off, A point is 0 current potential.S on 3rd brachium pontis and four bridge legs ₁₀, S ₁₁, S ₁₂, S ₁₃open-minded, S ₉, S ₁₄, S ₁₅, S ₁₆turn off, through route D ₁₃, S ₁₀, S ₁₁, S ₁₂and S ₁₃, D ₂₄, D ₂₀, D ₁₄, make B point obtain the current potential E identical with O1.Now between AB, voltage is-E.

S on (7) first brachium pontis and the second brachium pontis ₄, S ₅, S ₆, S ₇open-minded, S ₁, S ₂, S ₃, S ₈turn off, through route D ₅, D ₉, D ₁₁, S ₄and S ₅, S ₆, S ₇, D ₆, make A point current potential and O ₃identical, its current potential is-E; S on 3rd brachium pontis and four bridge legs ₁₀, S ₁₁, S ₁₂, S ₁₃open-minded, S ₉, S ₁₄, S ₁₅, S ₁₆turn off, B point current potential is E.Now between AB, voltage is-2E.

S on (8) first brachium pontis and the second brachium pontis ₄, S ₅, S ₆, S ₇open-minded, S ₁, S ₂, S ₃, S ₈turn off, A point current potential is-E; S on 3rd brachium pontis and four bridge legs ₉, S ₁₀, S ₁₁, S ₁₂open-minded, S ₁₃, S ₁₄, S ₁₅, S ₁₆turn off, through route S ₉, S ₁₀, S ₁₁, S ₁₂connect, B point obtains and O ₀the current potential 2E that point is identical.Now between AB, voltage is-3E.

S on (9) first brachium pontis and the second brachium pontis ₅, S ₆, S ₇, S ₈open-minded, S ₁, S ₂, S ₃, S ₄turn off, A point is through S ₅, S ₆, S ₇, S ₈with O ₄connect, current potential is-2E.S on 3rd brachium pontis and four bridge legs ₉, S ₁₀, S ₁₁, S ₁₂open-minded, S ₁₃, S ₁₄, S ₁₅, S ₁₆turn off, B point current potential is 2E.Now between AB, voltage is-4E

In single polarity, the rising edge of load voltage is divided into four-stage, 0 → E → 2E → 3E → 4E; The flat-top section of load voltage remains on 4E; The trailing edge of load voltage is also divided into four-stage, 4E → 3E → 2E → E → 0.

Beneficial effect: the ceiling voltage that in (1) circuit, each power device bears is 1/4th of DC bus-bar voltage, can realize the output of large voltage with high-frequency MOSFET pipe.(2) voltage clamp of clamp diode within single level, is solved many level and exports clamp diode reverse-recovery problems by the five level topologys improved.(3) all keep 8 MOSFET pipes to open when exporting any level in circuit, 8 MOSFET pipes turn off; And between adjacent levels, switch the state only switching 2 MOSFET pipes, control strategy simply ensure that good stability.(4) high-voltage inverted bridge road exports within the half period is that five level steps rise, and has less dv/dt, reduce insulation and impact and electromagnetic interference compared with existing equipment.(5) MOSFET pipe can high-frequency output under high voltages, ensure that the degree of depth and the precision of detection simultaneously.(6) radiating circuit meets the application demand within frequency domain electromagnetic methods 500kHz, has obvious superiority.

Accompanying drawing illustrates:

Fig. 1 is transient electromagnetic method grounded source five level emission circuit structure block diagram

Fig. 2 is five level emission bridge road topology diagrams in Fig. 1

Fig. 3 is the oscillogram of time-domain output and drive singal thereof

Fig. 4 is the oscillogram of frequency domain output and drive singal thereof

Fig. 5 is graph of a relation that emission system output voltage is corresponding with switching element switch state (0 represent turn off, 1 represents open-minded).

Embodiment:

Below in conjunction with drawings and Examples, the utility model is described in further detail.

Transient electromagnetic method grounded source five level emission circuit; by to control and protective circuit is connected with earth load with five level emission bridge roads through three controlled rectification circuits, DC/DC; five level emission bridge roads through to drive and protective circuit, combiner circuit and frequency dividing circuit produce circuit with reference frequency and be connected, combiner circuit respectively with rising edge control circuit, trailing edge control circuit, comment and push up control circuit and synchronous circuit connects and composes.

Multi-level high-voltage HF-electromagnetism radiating circuit, this circuit exports in unipolarity, is divided into five level, four identical direct voltage E ₁, E ₂, E ₃, E ₄earth load is connected to by many level loop.

Many level emission bridge route 16 MOSFET (S ₁, S ₂, S ₃, S ₄, S ₅, S ₆, S ₇, S ₈, S ₉, S ₁₀, S ₁₁, S ₁₂, S ₁₃, S ₁₄, S ₁₅, S ₁₆), 16 fly-wheel diode (VD ₁, VD ₂, VD ₃, VD ₄, VD ₅, VD ₆, VD ₇, VD ₈, VD ₉, VD ₁₀, VD ₁₁, VD ₁₂, VD ₁₃, VD ₁₄, VD ₁₅, VD ₁₆), 22 reverse parallel connection clamp diode (D ₁, D ₂, D ₃, D ₄, D ₅, D ₆, D ₇, D ₈, D ₉, D ₁₀, D ₁₁, D ₁₂, D ₁₃, D ₁₄, D ₁₅, D ₁₆, D ₁₇, D ₁₈, D ₁₉, D ₂₀, D ₂₁, D ₂₂) composition.

Power supply E1, E2, E3, E4 first connect, and then in parallel with many level emission bridge road.Many level emission bridge road is divided into four brachium pontis, and each brachium pontis is divided into four switching device MOSFET and four reverse fly-wheel diode VD to form:

S in first brachium pontis ₁with VD ₁parallel connection, S ₂with VD ₂parallel connection, S ₃with VD ₃parallel connection, S ₄with VD ₄parallel connection, then four is composed in series the first brachium pontis, wherein S successively ₁with S ₂tie point is designated as F ₁, S ₂with S ₃tie point is designated as F ₂, S ₃with S ₄tie point is designated as F ₃;

S in second brachium pontis ₅with VD ₅parallel connection, S ₆with VD ₆parallel connection, S ₇with VD ₇parallel connection, S ₈with VD ₈parallel connection, then four is composed in series the second brachium pontis, wherein S successively ₅with S ₆tie point is designated as F ₄, S ₆with S ₇tie point is designated as F ₅, S ₇with S ₈tie point is designated as F ₆;

S in 3rd brachium pontis ₉with VD ₉parallel connection, S ₁₀with VD ₁₀parallel connection, S ₁₁with VD ₁₁parallel connection, S ₁₂with VD ₁₂parallel connection, then four is composed in series the 3rd brachium pontis, wherein S successively ₉with S ₁₀tie point is designated as F ₇, S ₁₀with S ₁₁tie point is designated as F ₈, S ₁₁with S ₁₂tie point is designated as F ₉;

S in four bridge legs ₁₃with VD ₁₃parallel connection, S ₁₄with VD ₁₄parallel connection, S ₁₅with VD ₁₅parallel connection, S ₁₆with VD ₁₆parallel connection, then four is composed in series four bridge legs, wherein S successively ₁₃with S ₁₄tie point is designated as F ₁₀, S ₁₄with S ₁₅tie point is designated as F ₁₁, S ₁₅with S ₁₆tie point is designated as F ₁₂.

Power supply power supply E ₁, E ₂, E ₃, E ₄its magnitude of voltage is identical, is E, connects successively in order.Wherein E ₁positive pole be designated as O ₀, E ₁with E ₂tie point be designated as O ₁, E ₂with E ₃tie point be designated as O ₂, E ₃with E ₄tie point be designated as O ₃, E ₄negative pole be designated as O ₄.Clamp diode D ₁, D ₂, D ₃, D ₄, D ₅, D ₆f is parallel in order after differential concatenation ₁with F ₆two ends, wherein D ₁with D ₂tie point be designated as M ₁, D ₂with D ₃tie point be designated as M ₂, D ₃with D ₄tie point be designated as M ₃, D ₄with D ₅tie point be designated as M ₄, D ₅with D ₆tie point be designated as M ₆.Clamp diode D ₇, D ₈, D ₉, D ₁₀f is parallel in order after differential concatenation ₂with F ₅two ends, wherein D ₇with D ₈tie point be designated as M ₆, D ₈with D ₉tie point be designated as M ₇, D ₉with D ₁₀tie point be designated as M ₈.Clamp diode D ₁₁, D ₁₂f is parallel in order after differential concatenation ₃with F ₄two ends, D ₁₁with D ₁₂tie point be designated as M ₉.

Clamp diode D ₁₃, D ₁₄, D ₁₅, D ₁₆, D ₁₇, D ₁₈f is parallel in order after differential concatenation ₇with F ₁₂two ends, wherein D ₁₃with D ₁₄tie point be designated as M ₁₀, D ₁₄with D ₁₅tie point be designated as M ₁₁, D ₁₅with D ₁₆tie point be designated as M ₁₂, D ₁₆with D ₁₇tie point be designated as M ₁₃, D ₁₇with D ₁₈tie point be designated as M ₁₄.Clamp diode D ₁₉, D ₂₀, D ₂₁, D ₂₂f is parallel in order after differential concatenation ₈with F ₁₁two ends, wherein D ₁₉with D ₂₀tie point be designated as M ₁₅, D ₂₀with D ₂₁tie point be designated as M ₁₆, D ₂₁with D ₂₂tie point be designated as M ₁₇.Clamp diode D ₂₃, D ₂₄f is parallel in order after differential concatenation ₉with F ₁₀two ends, D ₂₃with D ₂₄tie point be designated as M ₁₈.

The connected mode of above-mentioned various piece is as follows: O ₁with M ₁, O ₁with M ₁₀, O ₂with M ₃, O ₂with M ₁₂, O ₃with M ₅, O ₃with M ₁₄all directly connected by wire.M ₂with M ₆, M ₄with M ₈, M ₇with M ₉all directly connected by wire.M ₁₁with M ₁₅, M ₁₃with M ₁₇, M ₁₆with M ₁₈all directly connected by straight wire.First brachium pontis is connected with the second brachium pontis, and its tie point is A.3rd brachium pontis is connected with four bridge legs, and its tie point is B.Be in parallel with power supply after this two parts tandem construction parallel, form five level emission loops.Earth load is connected on A, between B

R is the earth equivalent resistance, and L is the equivalent inductance of earth lead.

Choose E ₂with E ₃the O of tie point ₂as 0 potential point, then O ₀current potential is 2E, O ₁current potential is E, O ₃current potential is-E, O ₄current potential is-2E.

In this kind of multi-level control strategies, AB point-to-point transmission co-exists in nine kinds of magnitudes of voltage.

S on (1) first brachium pontis and the second brachium pontis ₃, S ₄, S ₅, S ₆open-minded, S ₁, S ₂, S ₇, S ₈turn off, A point current potential is through route D ₃, D ₇, S ₃, S ₄and D ₄, D ₁₀, S ₅, S ₆with O ₂point connects, and its current potential is 0 current potential; S on 3rd brachium pontis and four bridge legs ₁₁, S ₁₂, S ₁₃, S ₁₄open-minded, S ₉, S ₁₀, S ₁₅, S ₁₆turn off, B point current potential is also 0, and now between AB, voltage is 0.

S on (2) first brachium pontis and the second brachium pontis ₂, S ₃, S ₄, S ₅open-minded, S ₁, S ₆, S ₇, S ₈turn off, through route D ₁, S ₂, S ₃, S ₄and D ₂, D ₈, D ₁₂, S ₅, make A point current potential and O ₁identical, its current potential is E; S on 3rd brachium pontis and four bridge legs ₁₁, S ₁₂, S ₁₃, S ₁₄open-minded, S ₉, S ₁₀, S ₁₅, S ₁₆turn off, B point current potential is still 0.Now between AB, voltage is E.

S on (3) first brachium pontis and the second brachium pontis ₂, S ₃, S ₄, S ₅open-minded, S ₁, S ₆, S ₇, S ₈turn off, A point current potential is E.S on 3rd brachium pontis and four bridge legs ₁₂, S ₁₃, S ₁₄, S ₁₅open-minded, S ₉, S ₁₀, S ₁₁, S ₁₆turn off, through route D ₁₇, D ₂₁, D ₂₃, S ₁₂and S ₁₃, S ₁₄, S ₁₅, D ₁₈, make B point obtain-E current potential identical with O3 point.Now between AB, voltage is 2E.

S on (4) first brachium pontis and the second brachium pontis ₁, S ₂, S ₃, S ₄open-minded, S ₅, S ₆, S ₇, S ₈turn off, A point is through S ₁, S ₂, S ₃, S ₄connect and O ₀point obtains identical current potential 2E.S on 3rd brachium pontis and four bridge legs ₁₂, S ₁₃, S ₁₄, S ₁₅open-minded, S ₉, S ₁₀, S ₁₁, S ₁₆turn off, B point current potential is-E.Now between AB, voltage is 3E.

S on (5) first brachium pontis and the second brachium pontis ₁, S ₂, S ₃, S ₄open-minded, S ₅, S ₆, S ₇, S ₈turn off, A point is through S ₁, S ₂, S ₃, S ₄connect and O ₀point obtains identical current potential 2E.S on 3rd brachium pontis and four bridge legs ₁₃, S ₁₄, S ₁₅, S ₁₆open-minded, S ₉, S ₁₀, S ₁₁, S ₁₂turn off, B point is through S ₁₃, S ₁₄, S ₁₅, S ₁₆connect and O ₄point obtains identical current potential-2E.Now between AB, voltage is 4E.

S on (6) first brachium pontis and the second brachium pontis ₃, S ₄, S ₅, S ₆open-minded, S ₁, S ₂, S ₇, S ₈turn off, A point is 0 current potential.S on 3rd brachium pontis and four bridge legs ₁₀, S ₁₁, S ₁₂, S ₁₃open-minded, S ₉, S ₁₄, S ₁₅, S ₁₆turn off, through route D ₁₃, S ₁₀, S ₁₁, S ₁₂and S ₁₃, D ₂₄, D ₂₀, D ₁₄, make B point obtain the current potential E identical with O1.Now between AB, voltage is-E.

S on (7) first brachium pontis and the second brachium pontis ₄, S ₅, S ₆, S ₇open-minded, S ₁, S ₂, S ₃, S ₈turn off, through route D ₅, D ₉, D ₁₁, S ₄and S ₅, S ₆, S ₇, D ₆, make A point current potential and O ₃identical, its current potential is-E; S on 3rd brachium pontis and four bridge legs ₁₀, S ₁₁, S ₁₂, S ₁₃open-minded, S ₉, S ₁₄, S ₁₅, S ₁₆turn off, B point current potential is E.Now between AB, voltage is-2E.

S on (8) first brachium pontis and the second brachium pontis ₄, S ₅, S ₆, S ₇open-minded, S ₁, S ₂, S ₃, S ₈turn off, A point current potential is-E; S on 3rd brachium pontis and four bridge legs ₉, S ₁₀, S ₁₁, S ₁₂open-minded, S ₁₃, S ₁₄, S ₁₅, S ₁₆turn off, through route S ₉, S ₁₀, S ₁₁, S ₁₂connect, B point obtains and O ₀the current potential 2E that point is identical.Now between AB, voltage is-3E.

S on (9) first brachium pontis and the second brachium pontis ₅, S ₆, S ₇, S ₈open-minded, S ₁, S ₂, S ₃, S ₄turn off, A point is through S ₅, S ₆, S ₇, S ₈with O ₄connect, current potential is-2E.S on 3rd brachium pontis and four bridge legs ₉, S ₁₀, S ₁₁, S ₁₂open-minded, S ₁₃, S ₁₄, S ₁₅, S ₁₆turn off, B point current potential is 2E.Now between AB, voltage is-4E

In single polarity, the rising edge of load voltage is divided into four-stage, 0 → E → 2E → 3E → 4E; The flat-top section of load voltage remains on 4E; The trailing edge of load voltage is also divided into four-stage, 4E → 3E → 2E → E → 0.

Five-level high-voltage high frequency grounded source emission system can be used for territory and the excitation waveform of frequency domain respectively launch time, and its control mode as shown in Figure 3 and Figure 4.

Launch for time-domain, its transmitted waveform cycle is T, and each intermediate level time is identical, is τ, and as shown in Figure 3, its basic step is as follows:

Within 0 ~ τ time period, S ₂, S ₃, S ₄, S ₅, S ₁₁, S ₁₂, S ₁₃, S ₁₄open-minded, S ₁, S ₆, S ₇, S ₈, S ₉, S ₁₀, S ₁₅, S ₁₆turn off, between AB, voltage is E.Its voltage follows current expression as shown in the formula shown in (1) as calculated.

$\left\{\begin{array}{c}{U}_{AB}\left(t\right)=E\\ I_{AB}\left(t\right)=\frac{E}{R}\left(1-e^{-\frac{R}{L}t}\right)\end{array}\right.---\left(1\right)$

Within the τ ~ 2 τ time period, S ₂, S ₃, S ₄, S ₅, S ₁₂, S ₁₃, S ₁₄, S ₁₅open-minded, S ₁, S ₆, S ₇, S ₈, S ₉, S ₁₀, S ₁₁, S ₁₆turn off, between AB, voltage is 2E.Its voltage follows current expression as shown in the formula shown in (2) as calculated.

$\left\{\begin{array}{c}{U}_{AB}\left(t\right)=2E\\ I_{AB}\left(t\right)=\frac{E}{R}\[2-e^{-\frac{R}{L}\left(t-\mathrm{\τ}\right)}\]\end{array}\right.---\left(2\right)$

Within 2 τ ~ 3 τ time periods, S ₁, S ₂, S ₃, S ₄, S ₁₂, S ₁₃, S ₁₄, S ₁₅open-minded, S ₅, S ₆, S ₇, S ₈, S ₉, S ₁₀, S ₁₁, S ₁₆turn off, between AB, voltage is 3E.Its voltage follows current expression as shown in the formula shown in (3) as calculated.

$\left\{\begin{array}{c}{U}_{AB}\left(t\right)=3E\\ I_{AB}\left(t\right)=\frac{E}{R}\[3-e^{-\frac{R}{L}\left(t-2\mathrm{\τ}\right)}\]\end{array}\right.---\left(3\right)$

Within 3 τ ~ T/4-3 τ time periods, S ₁, S ₂, S ₃, S ₄, S ₁₃, S ₁₄, S ₁₅, S ₁₆open-minded, S ₅, S ₆, S ₇, S ₈, S ₉, S ₁₀, S ₁₁, S ₁₂turn off, between AB, voltage is 4E.Its voltage follows current expression as shown in the formula shown in (4) as calculated.

$\left\{\begin{array}{c}{U}_{AB}\left(t\right)=4E\\ I_{AB}\left(t\right)=\frac{E}{R}\[4-e^{-\frac{R}{L}\left(t-3\mathrm{\τ}\right)}\]\end{array}\right.---\left(4\right)$

Within T/4-3 τ ~ T/4-2 τ time period, S ₁, S ₂, S ₃, S ₄, S ₁₂, S ₁₃, S ₁₄, S ₁₅open-minded, S ₅, S ₆, S ₇, S ₈, S ₉, S ₁₀, S ₁₁, S ₁₆turn off, between AB, voltage is 3E.Its voltage follows current expression as shown in the formula shown in (5) as calculated.

$\left\{\begin{array}{c}{U}_{AB}\left(t\right)=3E\\ I_{AB}\left(t\right)=\frac{E}{R}\[3+e^{-\frac{R}{L}\left(t-\frac{T}{4}+3\mathrm{\τ}\right)}\]\end{array}\right.---\left(5\right)$

Within T/4-2 τ ~ T/4-τ time period, S ₂, S ₃, S ₄, S ₅, S ₁₂, S ₁₃, S ₁₄, S ₁₅open-minded, S ₁, S ₆, S ₇, S ₈, S ₉, S ₁₀, S ₁₁, S ₁₆turn off, between AB, voltage is 2E.Its voltage follows current expression as shown in the formula shown in (6) as calculated.

$\left\{\begin{array}{c}{U}_{AB}\left(t\right)=2E\\ I_{AB}\left(t\right)=\frac{E}{R}\[2+e^{-\frac{R}{L}\left(t-\frac{T}{4}+2\mathrm{\τ}\right)}\]\end{array}\right.---\left(6\right)$

Within T/4-τ ~ T/4 time period, S ₂, S ₃, S ₄, S ₅, S ₁₁, S ₁₂, S ₁₃, S ₁₄open-minded, S ₁, S ₆, S ₇, S ₈, S ₉, S ₁₀, S ₁₅, S ₁₆turn off, between AB, voltage is E.Its voltage follows current expression as shown in the formula shown in (7) as calculated.

$\left\{\begin{array}{c}{U}_{AB}\left(t\right)=E\\ I_{AB}\left(t\right)=\frac{E}{R}\[1+e^{-\frac{R}{L}\left(t-\frac{T}{4}+\mathrm{\τ}\right)}\]\end{array}\right.---\left(7\right)$

Within T/4 ~ T/2 time period, S ₃, S ₄, S ₅, S ₆, S ₁₁, S ₁₂, S ₁₃, S ₁₄open-minded, S ₁, S ₂, S ₇, S ₈, S ₉, S ₁₀, S ₁₅, S ₁₆turn off, between AB, voltage is 0.Its voltage follows current expression as shown in the formula shown in (8) as calculated.

$\left\{\begin{array}{c}{U}_{AB}\left(t\right)=0\\ I_{AB}\left(t\right)=\frac{E}{R}{e}^{-\frac{R}{L}\left(t-\frac{T}{4}\right)}\end{array}\right.---\left(8\right)$

Within 0 ~ T/2 time period, load current experienced by the rising of a forward, and flat-top section keeps, drops to zero, keeps zero process.At T/2 ~ T, in the time period, load current is a reverse rising, the maintenance of flat-top section, the process dropping to zero, keep zero.Do not repeat them here.

Launch for frequency domain, its transmitted waveform cycle is T, and each intermediate level time is identical, is τ, and as shown in Figure 4, its basic step is as follows:

Within 0 ~ τ time period, S ₂, S ₃, S ₄, S ₅, S ₁₁, S ₁₂, S ₁₃, S ₁₄open-minded, S ₁, S ₆, S ₇, S ₈, S ₉, S ₁₀, S ₁₅, S ₁₆turn off, between AB, voltage is E.Its voltage follows current expression as shown in the formula shown in (9) as calculated.

$\left\{\begin{array}{c}{U}_{AB}\left(t\right)=E\\ I_{AB}\left(t\right)=\frac{E}{R}\left(1-e^{-\frac{R}{L}t}\right)\end{array}\right.---\left(9\right)$

Within the τ ~ 2 τ time period, S ₂, S ₃, S ₄, S ₅, S ₁₂, S ₁₃, S ₁₄, S ₁₅open-minded, S ₁, S ₆, S ₇, S ₈, S ₉, S ₁₀, S ₁₁, S ₁₆turn off, between AB, voltage is 2E.Its voltage follows current expression as shown in the formula shown in (10) as calculated.

$\left\{\begin{array}{c}{U}_{AB}\left(t\right)=2E\\ I_{AB}\left(t\right)=\frac{E}{R}\[2-e^{-\frac{R}{L}\left(t-\mathrm{\τ}\right)}\]\end{array}\right.---\left(10\right)$

Within 2 τ ~ 3 τ time periods, S ₁, S ₂, S ₃, S ₄, S ₁₂, S ₁₃, S ₁₄, S ₁₅open-minded, S ₅, S ₆, S ₇, S ₈, S ₉, S ₁₀, S ₁₁, S ₁₆turn off, between AB, voltage is 3E.Its voltage follows current expression as shown in the formula shown in (11) as calculated.

$\left\{\begin{array}{c}{U}_{AB}\left(t\right)=3E\\ I_{AB}\left(t\right)=\frac{E}{R}\[3-e^{-\frac{R}{L}\left(t-2\mathrm{\τ}\right)}\]\end{array}\right.---\left(11\right)$

Within 3 τ ~ T/2-3 τ time periods, S ₁, S ₂, S ₃, S ₄, S ₁₃, S ₁₄, S ₁₅, S ₁₆open-minded, S ₅, S ₆, S ₇, S ₈, S ₉, S ₁₀, S ₁₁, S ₁₂turn off, between AB, voltage is 4E.Its voltage follows current expression as shown in the formula shown in (12) as calculated.

$\left\{\begin{array}{c}{U}_{AB}\left(t\right)=4E\\ I_{AB}\left(t\right)=\frac{E}{R}\[4-e^{-\frac{R}{L}\left(t-3\mathrm{\τ}\right)}\]\end{array}\right.---\left(12\right)$

Within T/2-3 τ ~ T/2-2 τ time period, S ₁, S ₂, S ₃, S ₄, S ₁₂, S ₁₃, S ₁₄, S ₁₅open-minded, S ₅, S ₆, S ₇, S ₈, S ₉, S ₁₀, S ₁₁, S ₁₆turn off, between AB, voltage is 3E.Its voltage follows current expression as shown in the formula shown in (13) as calculated.

$\left\{\begin{array}{c}{U}_{AB}\left(t\right)=3E\\ I_{AB}\left(t\right)=\frac{E}{R}\[3+e^{-\frac{R}{L}\left(t-\frac{T}{2}+3\mathrm{\τ}\right)}\]\end{array}\right.---\left(13\right)$

Within T/2-2 τ ~ T/2-τ time period, S ₂, S ₃, S ₄, S ₅, S ₁₂, S ₁₃, S ₁₄, S ₁₅open-minded, S ₁, S ₆, S ₇, S ₈, S ₉, S ₁₀, S ₁₁, S ₁₆turn off, between AB, voltage is 2E.Its voltage follows current expression as shown in the formula shown in (14) as calculated.

$\left\{\begin{array}{c}{U}_{AB}\left(t\right)=2E\\ I_{AB}\left(t\right)=\frac{E}{R}\[2+e^{-\frac{R}{L}\left(t-\frac{T}{2}+2\mathrm{\τ}\right)}\]\end{array}\right.---\left(14\right)$

Within T/2-τ ~ T/2 time period, S ₂, S ₃, S ₄, S ₅, S ₁₁, S ₁₂, S ₁₃, S ₁₄open-minded, S ₁, S ₆, S ₇, S ₈, S ₉, S ₁₀, S ₁₅, S ₁₆turn off, between AB, voltage is E.Its voltage follows current expression as shown in the formula shown in (15) as calculated.

$\left\{\begin{array}{c}{U}_{AB}\left(t\right)=E\\ I_{AB}\left(t\right)=\frac{E}{R}\[1+e^{-\frac{R}{L}\left(t-\frac{T}{2}+\mathrm{\τ}\right)}\]\end{array}\right.---\left(15\right)$

Within 0 ~ T/2 time period, load current experienced by the rising of a forward, and flat-top section keeps, drops to zero, keeps zero process.At T/2 ~ T, in the time period, load current is a reverse rising, the maintenance of flat-top section, the process dropping to zero, keep zero.Do not repeat them here.

Claims (10)

1. a transient electromagnetic method grounded source five level emission circuit; by to control and protective circuit connects to form through three controlled rectification circuits, DC/DC and five level emission bridge roads and earth load; it is characterized in that; five level emission bridge roads produce circuit through driving and protective circuit, combiner circuit and frequency dividing circuit with reference frequency and are connected, and combiner circuit connects and composes with rising edge control circuit, trailing edge control circuit, flat-top control circuit and synchronous circuit respectively.

2. according to transient electromagnetic method grounded source five level emission circuit according to claim 1, it is characterized in that, the output on five level emission bridge roads is divided into five level in unipolarity, four identical direct voltage E ₁, E ₂, E ₃, E ₄earth load is connected to by many level loop.

3. according to transient electromagnetic method grounded source five level emission circuit according to claim 1, it is characterized in that, five level emission bridge routes, 16 MOSFET:S ₁, S ₂, S ₃, S ₄, S ₅, S ₆, S ₇, S ₈, S ₉, S ₁₀, S ₁₁, S ₁₂, S ₁₃, S ₁₄, S ₁₅, S ₁₆, 16 fly-wheel diode: VD ₁, VD ₂, VD ₃, VD ₄, VD ₅, VD ₆, VD ₇, VD ₈, VD ₉, VD ₁₀, VD ₁₁, VD ₁₂, VD ₁₃, VD ₁₄, VD ₁₅, VD ₁₆, 22 reverse parallel connection clamp diode: D ₁, D ₂, D ₃, D ₄, D ₅, D ₆, D ₇, D ₈, D ₉, D ₁₀, D ₁₁, D ₁₂, D ₁₃, D ₁₄, D ₁₅, D ₁₆, D ₁₇, D ₁₈, D ₁₉, D ₂₀, D ₂₁, D ₂₂composition.

4. according to transient electromagnetic method grounded source five level emission circuit according to claim 2, it is characterized in that, power supply E1, E2, E3, E4 first connect, and then it is in parallel with many level emission bridge road, many level emission bridge road is divided into four brachium pontis, and each brachium pontis is divided into four switching device MOSFET and four reverse fly-wheel diode VD to form:

S in first brachium pontis ₁with VD ₁parallel connection, S ₂with VD ₂parallel connection, S ₃with VD ₃parallel connection, S ₄with VD ₄parallel connection, then four is composed in series the first brachium pontis, wherein S successively ₁with S ₂tie point is designated as F ₁, S ₂with S ₃tie point is designated as F ₂, S ₃with S ₄tie point is designated as F ₃;

S in second brachium pontis ₅with VD ₅parallel connection, S ₆with VD ₆parallel connection, S ₇with VD ₇parallel connection, S ₈with VD ₈parallel connection, then four is composed in series the second brachium pontis, wherein S successively ₅with S ₆tie point is designated as F ₄, S ₆with S ₇tie point is designated as F ₅, S ₇with S ₈tie point is designated as F ₆;

S in 3rd brachium pontis ₉with VD ₉parallel connection, S ₁₀with VD ₁₀parallel connection, S ₁₁with VD ₁₁parallel connection, S ₁₂with VD ₁₂parallel connection, then four is composed in series the 3rd brachium pontis, wherein S successively ₉with S ₁₀tie point is designated as F ₇, S ₁₀with S ₁₁tie point is designated as F ₈, S ₁₁with S ₁₂tie point is designated as F ₉;

S in four bridge legs ₁₃with VD ₁₃parallel connection, S ₁₄with VD ₁₄parallel connection, S ₁₅with VD ₁₅parallel connection, S ₁₆with VD ₁₆parallel connection, then four is composed in series four bridge legs, wherein S successively ₁₃with S ₁₄tie point is designated as F ₁₀, S ₁₄with S ₁₅tie point is designated as F ₁₁, S ₁₅with S ₁₆tie point is designated as F ₁₂.

5., according to transient electromagnetic method grounded source five level emission circuit according to claim 2, it is characterized in that, power supply E ₁, E ₂, E ₃, E ₄its magnitude of voltage is identical, is E, connects successively in order, wherein E ₁positive pole be designated as O ₀, E ₁with E ₂tie point be designated as O ₁, E ₂with E ₃tie point be designated as O ₂, E ₃with E ₄tie point be designated as O ₃, E ₄negative pole be designated as O ₄, clamp diode D ₁, D ₂, D ₃, D ₄, D ₅, D ₆f is parallel in order after differential concatenation ₁with F ₆two ends, wherein D ₁with D ₂tie point be designated as M ₁, D ₂with D ₃tie point be designated as M ₂, D ₃with D ₄tie point be designated as M ₃, D ₄with D ₅tie point be designated as M ₄, D ₅with D ₆tie point be designated as M ₆, clamp diode D ₇, D ₈, D ₉, D ₁₀f is parallel in order after differential concatenation ₂with F ₅two ends, wherein D ₇with D ₈tie point be designated as M ₆, D ₈with D ₉tie point be designated as M ₇, D ₉with D ₁₀tie point be designated as M ₈, clamp diode D ₁₁, D ₁₂f is parallel in order after differential concatenation ₃with F ₄two ends, D ₁₁with D ₁₂tie point be designated as M ₉.

6., according to transient electromagnetic method grounded source five level emission circuit according to claim 3, it is characterized in that, clamp diode D ₁₃, D ₁₄, D ₁₅, D ₁₆, D ₁₇, D ₁₈f is parallel in order after differential concatenation ₇with F ₁₂two ends, wherein D ₁₃with D ₁₄tie point be designated as M ₁₀, D ₁₄with D ₁₅tie point be designated as M ₁₁, D ₁₅with D ₁₆tie point be designated as M ₁₂, D ₁₆with D ₁₇tie point be designated as M ₁₃, D ₁₇with D ₁₈tie point be designated as M ₁₄, clamp diode D ₁₉, D ₂₀, D ₂₁, D ₂₂f is parallel in order after differential concatenation ₈with F ₁₁two ends, wherein D ₁₉with D ₂₀tie point be designated as M ₁₅, D ₂₀with D ₂₁tie point be designated as M ₁₆, D ₂₁with D ₂₂tie point be designated as M ₁₇, clamp diode D ₂₃, D ₂₄f is parallel in order after differential concatenation ₉with F ₁₀two ends, D ₂₃with D ₂₄tie point be designated as M ₁₈.

7., according to transient electromagnetic method grounded source five level emission circuit according to claim 5, it is characterized in that, the connected mode of O and M is: O ₁with M ₁, O ₁with M ₁₀, O ₂with M ₃, O ₂with M ₁₂, O ₃with M ₅, O ₃with M ₁₄all directly connected by wire, M ₂with M ₆, M ₄with M ₈, M ₇with M ₉all directly connected by wire, M ₁₁with M ₁₅, M ₁₃with M ₁₇, M ₁₆with M ₁₈all directly connected by straight wire.

8. according to transient electromagnetic method grounded source five level emission circuit according to claim 4, it is characterized in that, first brachium pontis is connected with the second brachium pontis, its tie point is A, and the 3rd brachium pontis is connected with four bridge legs, and its tie point is B, be in parallel with power supply after this two parts tandem construction parallel, form five level emission loops, earth load is connected on A, between B;

R is the earth equivalent resistance, and L is the equivalent inductance of earth lead.

9., according to transient electromagnetic method grounded source five level emission circuit according to claim 4, it is characterized in that, choose E ₂with E ₃the O of tie point ₂as 0 potential point, then O ₀current potential is 2E, O ₁current potential is E, O ₃current potential is-E, O ₄current potential is-2E.

10., according to transient electromagnetic method grounded source five level emission circuit according to claim 8, it is characterized in that, AB point-to-point transmission co-exists in nine kinds of magnitudes of voltage:

S on (1) first brachium pontis and the second brachium pontis ₃, S ₄, S ₅, S ₆open-minded, S ₁, S ₂, S ₇, S ₈turn off, A point current potential is through route D ₃, D ₇, S ₃, S ₄and D ₄, D ₁₀, S ₅, S ₆with O ₂point connects, and its current potential is 0 current potential; S on 3rd brachium pontis and four bridge legs ₁₁, S ₁₂, S ₁₃, S ₁₄open-minded, S ₉, S ₁₀, S ₁₅, S ₁₆turn off, B point current potential is also 0, and now between AB, voltage is 0;

S on (2) first brachium pontis and the second brachium pontis ₂, S ₃, S ₄, S ₅open-minded, S ₁, S ₆, S ₇, S ₈turn off, through route D ₁, S ₂, S ₃, S ₄and D ₂, D ₈, D ₁₂, S ₅, make A point current potential and O ₁identical, its current potential is E; S on 3rd brachium pontis and four bridge legs ₁₁, S ₁₂, S ₁₃, S ₁₄open-minded, S ₉, S ₁₀, S ₁₅, S ₁₆turn off, B point current potential is still 0; Now between AB, voltage is E;

S on (3) first brachium pontis and the second brachium pontis ₂, S ₃, S ₄, S ₅open-minded, S ₁, S ₆, S ₇, S ₈turn off, A point current potential is E, S on the 3rd brachium pontis and four bridge legs ₁₂, S ₁₃, S ₁₄, S ₁₅open-minded, S ₉, S ₁₀, S ₁₁, S ₁₆turn off, through route D ₁₇, D ₂₁, D ₂₃, S ₁₂and S ₁₃, S ₁₄, S ₁₅, D ₁₈, make B point obtain-E current potential identical with O3 point, now between AB, voltage is 2E;

S on (4) first brachium pontis and the second brachium pontis ₁, S ₂, S ₃, S ₄open-minded, S ₅, S ₆, S ₇, S ₈turn off, A point is through S ₁, S ₂, S ₃, S ₄connect and O ₀point obtains identical current potential 2E, S on the 3rd brachium pontis and four bridge legs ₁₂, S ₁₃, S ₁₄, S ₁₅open-minded, S ₉, S ₁₀, S ₁₁, S ₁₆turn off, B point current potential is-E, and now between AB, voltage is 3E;

S on (5) first brachium pontis and the second brachium pontis ₁, S ₂, S ₃, S ₄open-minded, S ₅, S ₆, S ₇, S ₈turn off, A point is through S ₁, S ₂, S ₃, S ₄connect and O ₀point obtains identical current potential 2E, S on the 3rd brachium pontis and four bridge legs ₁₃, S ₁₄, S ₁₅, S ₁₆open-minded, S ₉, S ₁₀, S ₁₁, S ₁₂turn off, B point is through S ₁₃, S ₁₄, S ₁₅, S ₁₆connect and O ₄point obtains identical current potential-2E, and now between AB, voltage is 4E;

S on (6) first brachium pontis and the second brachium pontis ₃, S ₄, S ₅, S ₆open-minded, S ₁, S ₂, S ₇, S ₈turn off, A point is 0 current potential, S on the 3rd brachium pontis and four bridge legs ₁₀, S ₁₁, S ₁₂, S ₁₃open-minded, S ₉, S ₁₄, S ₁₅, S ₁₆turn off, through route D ₁₃, S ₁₀, S ₁₁, S ₁₂and S ₁₃, D ₂₄, D ₂₀, D ₁₄, make B point obtain the current potential E identical with O1, now between AB, voltage is-E;

S on (7) first brachium pontis and the second brachium pontis ₄, S ₅, S ₆, S ₇open-minded, S ₁, S ₂, S ₃, S ₈turn off, through route D ₅, D ₉, D ₁₁, S ₄and S ₅, S ₆, S ₇, D ₆, make A point current potential and O ₃identical, its current potential is-E; S on 3rd brachium pontis and four bridge legs ₁₀, S ₁₁, S ₁₂, S ₁₃open-minded, S ₉, S ₁₄, S ₁₅, S ₁₆turn off, B point current potential is E, and now between AB, voltage is-2E;

S on (8) first brachium pontis and the second brachium pontis ₄, S ₅, S ₆, S ₇open-minded, S ₁, S ₂, S ₃, S ₈turn off, A point current potential is-E; S on 3rd brachium pontis and four bridge legs ₉, S ₁₀, S ₁₁, S ₁₂open-minded, S ₁₃, S ₁₄, S ₁₅, S ₁₆turn off, through route S ₉, S ₁₀, S ₁₁, S ₁₂connect, B point obtains and O ₀the current potential 2E that point is identical, now between AB, voltage is-3E;

S on (9) first brachium pontis and the second brachium pontis ₅, S ₆, S ₇, S ₈open-minded, S ₁, S ₂, S ₃, S ₄turn off, A point is through S ₅, S ₆, S ₇, S ₈with O ₄connect, current potential is-2E, S on the 3rd brachium pontis and four bridge legs ₉, S ₁₀, S ₁₁, S ₁₂open-minded, S ₁₃, S ₁₄, S ₁₅, S ₁₆turn off, B point current potential is 2E, and now between AB, voltage is-4E;

In single polarity, the rising edge of load voltage is divided into four-stage, 0 → E → 2E → 3E → 4E; The flat-top section of load voltage remains on 4E; The trailing edge of load voltage is also divided into four-stage: 4E → 3E → 2E → E → 0.