CN112994442B - Improved method of capacitor filter bridge type uncontrolled rectifier - Google Patents

Improved method of capacitor filter bridge type uncontrolled rectifier Download PDF

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CN112994442B
CN112994442B CN202110171855.0A CN202110171855A CN112994442B CN 112994442 B CN112994442 B CN 112994442B CN 202110171855 A CN202110171855 A CN 202110171855A CN 112994442 B CN112994442 B CN 112994442B
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rectifier
capacitor
rectifier bridge
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CN112994442A (en
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王懿杰
麦建伟
曾宪瑞
姚友素
张相军
徐殿国
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Harbin Institute of Technology
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/06—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/12—Arrangements for reducing harmonics from ac input or output
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/08—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes without control electrode or semiconductor devices without control electrode

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Abstract

Capacitor filter bridge type uncontrolled rectifierThe method belongs to the technical field of bridge type uncontrolled rectification. The invention aims at the problem that when the load of the existing capacitor filter bridge type uncontrolled rectifier is increased, the input impedance angle is increased along with the increase of the load, so that the equivalent load impedance presents an inductive property. It is based on traditional capacitor filter rectifier bridge, and between two input ends of said rectifier bridge an auxiliary capacitor C is parallelly-connectedAdObtaining an improved capacitor filter rectifier bridge; the auxiliary capacitor CAdWhen the load resistance value is too large and the rectifier bridge works in an intermittent conduction mode, a follow current loop is provided for the input current, and the input current is not zero. The improved capacitor filtering rectifier bridge obtained by the invention can obviously reduce the input impedance angle of the rectifier bridge in the discontinuous conduction mode on the premise of hardly increasing the system cost and the control complexity.

Description

Improved method of capacitor filter bridge type uncontrolled rectifier
Technical Field
The invention relates to an improvement method of a capacitor filter bridge type uncontrolled rectifier, and belongs to the technical field of bridge type uncontrolled rectification.
Background
In the field of power electronic converters, the most common rectifying and filtering circuit is a capacitor filtering bridge type uncontrolled rectifier, which is widely used due to simple structure, no need of control and high stability.
In a capacitor filter rectifier circuit, it is generally considered that after a resistive load is applied to an output side, an equivalent impedance viewed from an input end of a rectifier bridge backward is approximately resistive. As the load resistance increases, the input impedance angle of the rectifier bridge will gradually increase from approximately zero. At this time, the equivalent impedance can no longer be considered as resistive, because the equivalent load impedance at this time will exhibit a significant inductive character, and many conventional circuit analysis methods are no longer accurate. In addition, accompanying phenomena such as distortion of input voltage and current, loss of input voltage duty ratio, etc., may cause the harmonic content and reactive component of the system to increase. This circuit operation state is called an intermittent mode, and is caused by an excessively large load resistance on the output side of the rectifier bridge. Therefore, the load value is required to be considered to enable the circuit to work in a continuous mode, so that the capacitor filter rectifying circuit cannot be used under a specific load, and the load value range of the rectifying circuit and the application of the capacitor filter rectifying circuit in the field of power electronic converters are greatly limited.
Currently, solutions to the above problems can be broadly divided into two broad categories. The first type is based on a specific circuit topology, which is compensated by its characteristics. For example, in a wireless power transmission system, researchers eliminate negative effects caused by the discontinuous mode by adjusting the size of a secondary compensation capacitor in the double-side LCC compensation topology; by providing the improved S/CLCL topology, the load resistance range of the rectifier bridge working in a continuous mode is expanded, so that the rectifier bridge is prevented from working in an intermittent mode as much as possible. The second type is to change the uncontrolled diode into a controllable device by improving the structure of the rectifier bridge, so as to control the input voltage and current to have the same phase. For example, one group has proposed an active bridge type single-phase rectifier based on impedance angle detection, in which diodes in a conventional rectifier bridge are replaced with controllable field effect transistors, and the input impedance angle is controlled to be always kept at approximately zero by an algorithm. Although the above two schemes reduce the adverse effect of the rectifier circuit operating in the discontinuous mode to some extent, there are relatively large limitations: the first scheme has serious defects of poor universality and unsatisfactory effect, and only widens the load range of a continuous mode to a certain extent; the second type of scheme solves the problems from the root and has generality, but the second type of scheme has high cost and complex control and increases the instability of the system.
Disclosure of Invention
The invention provides an improved method of a capacitive filtering bridge type uncontrolled rectifier, aiming at the problem that when the load of the existing capacitive filtering bridge type uncontrolled rectifier is increased, the angle of input impedance is increased along with the increase of the load, so that equivalent load impedance presents an inductive property.
The invention relates to an improvement method of a capacitor filter bridge type uncontrolled rectifier, which is based on a traditional capacitor filter rectifier bridge, and auxiliary electricity is connected in parallel between two input ends of the rectifier bridgeContainer CAdObtaining an improved capacitor filter rectifier bridge;
the auxiliary capacitor CAdWhen the load resistance value is too large and the rectifier bridge works in an intermittent conduction mode, a follow current loop is provided for the input current, and the input current is not zero.
According to the invention, the auxiliary capacitor C is used as a secondary capacitorAdThe values of (a) are obtained by simulation experiments.
According to the improvement method of the capacitor filter bridge type uncontrolled rectifier, when the load resistance value is between 1 and 100 omega in an IPT system based on an S/S compensation topology and an improved capacitor filter rectifier bridge, according to an auxiliary capacitor CAdUnder different values, the auxiliary capacitor C is selected according to the curve that the input impedance angle and the output current of the rectifier bridge change along with the resistance value of the loadAdThe values of (A) are as follows: cAd＝2.5nF。
According to the improvement method of the capacitor filter bridge type uncontrolled rectifier, when the load resistance value is between 1 and 100 omega in an IPT system based on LCC/S compensation topology and an improved capacitor filter rectifier bridge, according to the auxiliary capacitor CAdUnder different values, the auxiliary capacitor C is selected according to the curve that the input impedance angle and the output voltage of the rectifier bridge change along with the resistance value of the loadAdThe values of (A) are as follows: cAd＝2.5nF。
According to the improvement method of the capacitor filter bridge type uncontrolled rectifier, when the load resistance value is between 1 and 100 omega in an IPT system based on LCC/LCC compensation topology and an improved capacitor filter rectifier bridge, according to the auxiliary capacitor CAdUnder different values, the auxiliary capacitor C is selected according to the curve that the input impedance angle and the output current of the rectifier bridge change along with the resistance value of the loadAdThe values of (A) are as follows: cAd＝7nF。
The invention has the beneficial effects that: after the traditional capacitor filter rectifier bridge is improved by adopting the method, the obtained improved capacitor filter rectifier bridge can obviously reduce the input impedance angle of the rectifier bridge in the discontinuous conduction mode on the premise of hardly increasing the system cost and the control complexity. The capacitance value of the introduced parallel auxiliary capacitor is small, the voltage is low, and therefore the increased cost is very small. Compared with the traditional capacitor filter rectifier circuit, the improved capacitor filter rectifier bridge obtained by the method can enable the input impedance to be always close to the resistance, inhibit the distortion and duty ratio loss of voltage or current, reduce the harmonic content and reactive component of a system, improve the transmission efficiency of the system, enlarge the load range and enable the single-phase bridge capacitor filter rectifier circuit to be widely applied to the field of power electronic converters.
Drawings
FIG. 1 is a schematic diagram of an improved capacitor filter rectifier bridge obtained by the method of the present invention;
FIG. 2 is an equivalent circuit diagram of four working modes of the improved capacitor filter rectifier bridge in one working cycle; wherein (a) is an equivalent circuit diagram of a working mode I of the improved capacitor filter rectifier bridge; (b) the equivalent circuit diagram is a working mode II equivalent circuit diagram of the improved capacitor filter rectifier bridge; wherein (c) is a working mode III equivalent circuit diagram of the improved capacitor filter rectifier bridge; wherein (d) is a working mode IV equivalent circuit diagram of the improved capacitor filter rectifier bridge;
FIG. 3 is a graph of the voltage and current waveforms of the improved capacitor filter rectifier bridge during one duty cycle; in the figure iD1And iD4Are respectively a flow-through diode D1And D4Current of (i)D2And iD3Are respectively a flow-through diode D2And D3The current of (a);
FIG. 4 is a schematic diagram of an IPT system based on an S/S compensation topology and an improved capacitor filter rectifier bridge;
FIG. 5 is a graph of the relationship between the rectifier bridge input impedance angle and the load resistance in an IPT system simulation based on an S/S compensation topology and an improved capacitor filter rectifier bridge;
FIG. 6 is a graph of rectifier bridge output current versus load resistance in an IPT system simulation based on an S/S compensation topology and an improved capacitor filter rectifier bridge;
FIG. 7 is a schematic diagram of an IPT system based on an LCC/S compensation topology and an improved capacitor filter rectifier bridge;
FIG. 8 is a graph of the relationship between the rectifier bridge input impedance angle and the load resistance in an IPT system simulation based on an LCC/S compensation topology and an improved capacitor filter rectifier bridge;
FIG. 9 is a graph of rectifier bridge output voltage versus load resistance in an IPT system simulation based on LCC/S compensation topology and an improved capacitor filter rectifier bridge;
FIG. 10 is a schematic diagram of an IPT system based on an LCC/LCC compensation topology and an improved capacitor filter rectifier bridge;
FIG. 11 is a graph of the relationship between the rectifier bridge input impedance angle and the load resistance in an IPT system simulation based on an LCC/LCC compensation topology and an improved capacitor filter rectifier bridge;
FIG. 12 is a graph of rectifier bridge output current versus load resistance in an IPT system simulation based on an LCC/LCC compensation topology and an improved capacitor filter rectifier bridge;
FIG. 13 is a graph of the relationship between the input impedance angle and the load resistance before and after the capacitor filter rectifier bridge is improved in an IPT system based on a constant current S/S compensation topology designed in an embodiment;
FIG. 14 is a graph of output current versus load resistance before and after improvement of a capacitive filter rectifier bridge in an IPT system based on a constant current S/S compensation topology as designed in an embodiment;
FIG. 15 is a graph of the relationship between system efficiency and load resistance before and after the capacitor filter rectifier bridge is improved in an IPT system based on a constant current S/S compensation topology designed in an embodiment;
FIG. 16 is a graph of voltage and current waveforms of an inverter and a rectifier bridge when a conventional capacitive filtering rectifier bridge is used in an IPT system based on a constant current S/S compensation topology designed in an embodiment;
FIG. 17 is a voltage and current waveform diagram of an inverter and a rectifier bridge when an improved capacitor filter rectifier bridge is used in an IPT system based on a constant current S/S compensation topology designed in an embodiment.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The invention is further described with reference to the following drawings and specific examples, which are not intended to be limiting.
In the first embodiment, as shown in fig. 1 to 3, the present invention provides an improved method for a capacitor filter bridge type uncontrolled rectifier, which is based on a conventional capacitor filter rectifier bridge, and an auxiliary capacitor C is connected in parallel between two input ends of the rectifier bridgeAdObtaining an improved capacitor filter rectifier bridge;
the auxiliary capacitor CAdWhen the load resistance value is too large and the rectifier bridge works in an intermittent conduction mode, a follow current loop is provided for the input current, so that the input current ireNot zero, i.e. input current ireThe diode that is not turned off is clamped to zero, thereby reducing the phase shift of the current.
In FIG. 1, ureAnd ireRespectively an input-side voltage and an input-side current, U, of the rectifier bridgeLAnd ILIs the output side voltage and current; d1-D4Is a rectifier diode, CFIs a filter capacitor, RLIs the equivalent resistance of the load; u. of1And i1Actual input voltage and actual input current of the rectifier bridge; zreIs the equivalent impedance seen from the input side (i.e. the rectifier bridge input impedance). Compared with the traditional capacitor filtering rectifier bridge, the embodiment has the advantages that the small auxiliary capacitor C is connected in parallel with the input end of the rectifier bridgeAd。
The working mechanism of the improved capacitor filter rectifier bridge is analyzed by combining the mode of the improved capacitor filter rectifier bridge as follows:
in one working period T, due to the auxiliary capacitor CAdThe improved capacitor filter rectifier bridge topology has four working modes. As shown in fig. 2 and 3:
working mode I: auxiliary capacitor C at this timeAdFreewheeling in the forward direction, and the equivalent circuit of this mode is shown in fig. 2 (a). 0-t shown in FIG. 31In which all diodes are turned off and the current i is inputreAs an auxiliary capacitor CAdPositively charged as an auxiliary capacitor CAdThe voltage at two ends is higher than the voltage U at the output sideLTime, diode D1And D4That is, the circuit enters the working mode II.
And working mode II: the circuit is turned on for a positive half cycle, and the equivalent circuit is shown in fig. 2 (b). At t1-t2Inner, diode D1And D4Always conducting, the current flowing through them being greater than zero; input side voltage ureClamped by a diode and an output side voltage ULApproximately equal. This mode will continue until the input side current ireOccupies a large part of the positive half period of the rectifier bridge. When i isreAnd if the voltage is less than zero, the circuit enters a working mode III.
And working mode III: auxiliary capacitance CAdFreewheeling in the reverse direction, the equivalent circuit of this mode is shown in fig. 2 (c). Similar to the working mode I, at t2-t3In which all diodes are turned off and the current i is inputreAs an auxiliary capacitor CAdReversely charged when the auxiliary capacitor CAdThe absolute value of the voltage at the two ends is larger than the voltage U at the output sideLTime, diode D2And D3The circuit enters a working mode IV when the circuit is to be conducted.
And working mode IV: the negative half cycle of the circuit is on and the equivalent circuit is as shown in fig. 2 (d). Analogous to the working mode II, at t3-t4Inner, diode D2And D3On, input side current ireLess than zero; input side voltage ureIs also less than zero, amplitude and output voltage ULApproximately equal. This mode of operation will continue until the input side current ireOccupies most of the negative half period of the rectifier bridge. When the input side current ireAbove zero, the circuit returns to mode i and mode ii … … cycles back and forth.
Combining working modal analysis and signal waveformIt can be seen that when the conventional rectifier bridge operates in the mode I and the mode III, the actual input current i of the rectifier bridge1Always equals zero, resulting in an actual input current i1Lagging the actual input voltage u1A certain angle; in the improved capacitor filter rectifier bridge, the auxiliary capacitor CAdPresence of input side current ireIs not equal to the actual input current i1(i.e., not equal to zero), the phase shift is "compensated". Thus, the angle of the input impedance of the improved capacitor filter rectifier bridge proposed in the discontinuous mode is significantly reduced, and the equivalent impedance is also changed from inductive to nearly resistive.
Further, the auxiliary capacitor CAdThe values of (a) are obtained by simulation experiments.
Through the analysis of the working mode of the improved capacitor filter rectifier bridge, the conclusion that the input impedance angle of the rectifier can be reduced by the improved capacitor filter rectifier bridge is obtained theoretically. To obtain an auxiliary capacitance CAdAppropriate value of the auxiliary capacitor C is obtained, the validity of the topology is verified, a system can be set up to carry out a simulation experiment, and the auxiliary capacitor C is obtainedAdAnd verifying the performance of the system.
First, as an example, as shown in fig. 4 to 6, a constant current output inductive wireless power transfer (IPT) system based on an S/S compensation topology is built on a simulation software PSIM, and rectifier diodes selected by a simulation circuit are all ideal diodes. Table 1 is an IPT system parameter table based on an S/S compensation topology and an improved capacitor filter rectifier bridge.
TABLE 1
Figure BDA0002939175030000051
FIGS. 5 and 6 show the auxiliary capacitor C in the circuit simulation, respectivelyAdThe input impedance angle and the output current of the rectifier under different values change along with the equivalent resistance of the load. As can be seen from FIG. 5, a conventional rectifier bridge (C)Ad0) the rectifier input impedance angle has reached 25 ° at a load of 70 Ω; however, for the improved capacitor filter rectifier bridge, as long as the auxiliary capacitor is larger than 2.5nF, the rectifierThe input impedance angle can be close to or even smaller than 0 degrees, which shows that the input impedance angle of the rectifier can be obviously reduced by improving the topology of the capacitor filtering rectifier bridge, and the input impedance can be always kept resistive in a larger load range.
Although the auxiliary capacitance C is increasedAdThe impedance angle can be reduced significantly, but it is not preferable to take the larger the impedance angle, because the auxiliary capacitor C isAdThe selection of (a) also affects the output characteristics of the original circuit. It can be seen from an examination of figure 6 that for an S/S compensated IPT system rated for a constant current output of 3.35A, the output current decreases with increasing load. At CAdUnder the condition of being equal to zero, the output current is about 3.12A when the load resistance value is 100 omega; and if CAdThe output current of the system can reach more than 3.3A when the output current is 2.5nF, and the constant current output characteristic irrelevant to the system load is obviously superior to that of the traditional rectifier bridge.
In conclusion, the input impedance angle of the equivalent load impedance and the constant output characteristic of the original topology are considered at the same time, and when the load resistance value is between 1 and 100 omega in an IPT system based on the S/S compensation topology and the improved capacitor filter rectifier bridge, the auxiliary capacitor C is used for controlling the output voltage of the loadAdUnder different values, the auxiliary capacitor C is selected according to the curve that the input impedance angle and the output current of the rectifier bridge change along with the resistance value of the loadAdThe values of (A) are as follows:
CAd＝2.5nF。 (1)
as an example, as shown in fig. 7 to 9, a wireless power transfer (IPT) system based on the LCC/S compensation topology is built on the simulation software PSIM. And table 2 is an IPT system parameter table based on the LCC/S compensation topology and the improved capacitor filter rectifier bridge.
TABLE 2
Figure BDA0002939175030000061
FIGS. 8 and 9 show the auxiliary capacitor C in the circuit simulation, respectivelyAdThe input impedance angle and the output voltage of the rectifier under different values change along with the equivalent resistance of the load. As can be seen from FIG. 8, a conventional rectifier bridge (C)Ad0) the rectifier input impedance angle has reached 25 ° at a load of 80 Ω; however, for the improved capacitive filtering rectifier bridge, as long as the auxiliary capacitance is greater than 2.5nF, the rectifier input impedance angle can approach or even be smaller than 0 °, which shows that the improved capacitive filtering rectifier bridge topology can significantly reduce the rectifier input impedance angle, so that the input impedance can be always kept resistive in a larger load range.
Although the auxiliary capacitance C is increasedAdThe input impedance angle of the rectifier can be obviously reduced, but the larger the value of the input impedance angle is, the better the value of the input impedance angle is, because the auxiliary capacitor CAdThe selection of (a) also affects the output characteristics of the original circuit. It can be seen from an examination of fig. 9 that for an LCC/S compensated IPT system rated for a constant current 56V output, the output voltage increases with increasing load. At CAdUnder the condition of zero, the output voltage fluctuation is 54.6-56.9V at CAdThe output voltage fluctuation is 54.8-56.1V under the condition of being equal to 2.5nF, so the improved rectifier can reduce the fluctuation of the output voltage.
In conclusion, in the IPT system based on the LCC/S compensation topology and the improved capacitor filter rectifier bridge, when the load resistance value is between 1 and 100 omega, the load resistance value is determined according to the auxiliary capacitor CAdUnder different values, the auxiliary capacitor C is selected according to the curve that the input impedance angle and the output voltage of the rectifier bridge change along with the resistance value of the loadAdThe values of (A) are as follows: cAd＝2.5nF。
As an example, as shown in fig. 10 to 12, a wireless power transfer (IPT) system based on the LCC/LCC compensation topology is built on the simulation software PSIM, and table 3 is an IPT system parameter table based on the LCC/LCC compensation topology and the improved capacitor filter rectifier bridge.
TABLE 3
Figure BDA0002939175030000071
Figure BDA0002939175030000081
FIG. 11 and FIG. 12 show the power supplyAuxiliary capacitor C in circuit simulationAdThe input impedance angle and the output current of the rectifier under different values change along with the equivalent resistance of the load. As can be seen from FIG. 11, a conventional rectifier bridge (C)Ad0) the rectifier input impedance angle has reached 25 ° at a load of 40 Ω; however, for the improved capacitive filtering rectifier bridge, as long as the auxiliary capacitance is greater than 7nF, the rectifier input impedance angle can approach to or even be smaller than 0 °, which shows that the improved capacitive filtering rectifier bridge topology can significantly reduce the rectifier input impedance angle, so that the input impedance can be always kept resistive in a larger load range.
Although the auxiliary capacitance C is increasedAdThe input impedance angle can be significantly reduced, but the larger the value, the better the value is, because of the auxiliary capacitor CAdThe selection of (a) also affects the output characteristics of the original circuit. It can be seen from an examination of fig. 12 that for an LCC/S compensated IPT system rated for a constant current output of 3.4A, the output voltage increases with increasing load. At CAdUnder the condition of zero, the output voltage fluctuation is 3.38-2.87A at CAdWith the frequency of 7nF, the output voltage fluctuation is 3.38-3.23A, so the improved rectifier can reduce the fluctuation of the output current.
In conclusion, in the IPT system based on the LCC/LCC compensation topology and the improved capacitor filter rectifier bridge, when the load resistance value is between 1 and 100 omega, the load resistance value is determined according to the auxiliary capacitor CAdUnder different values, the auxiliary capacitor C is selected according to the curve that the input impedance angle and the output current of the rectifier bridge change along with the resistance value of the loadAdThe values of (A) are as follows: cAd＝7nF。
The specific embodiment is as follows: with reference to fig. 13 to 17, in order to verify the effectiveness of the improved capacitor filter rectifier bridge, an IPT system based on a constant current type S/S compensation topology is designed, and the constant current output type S/S compensation topology is one of the most commonly used compensation topologies. In a system formed by an S/S compensation topology, the performance of an improved capacitor filter rectifier bridge is verified by comparing the performance of the system adopting the improved capacitor filter rectifier bridge with the performance of the system adopting a traditional capacitor filter bridge rectifier. Fig. 4 shows a schematic diagram thereof. In comparison, a set of traditional capacitance filtering rectifier bridge IPT system and a set of improved capacitance filtering rectifier bridge system are respectively manufactured. And (4) building an IPT system experiment platform. In the improved capacitor filter rectifier bridge, the value of the auxiliary capacitor is given by a simulation result and a formula (1).
The design formula of the compensation parameters of the S/S compensation topology is shown as (2). The system parameters of the improved capacitor filter rectifier bridge and the traditional rectifier bridge are shown in table 4, and the compensation circuit parameters of the traditional rectifier and the improved capacitor filter rectifier bridge are slightly different, because the traditional rectifier can cause the equivalent alternating current impedance of the load to present the inductive property, which can cause the angular path capacity of the system input impedance and the realization of the soft switch to be impossible, so the CP value needs to be increased to cause the system input impedance angle to present the inductive property, which helps the realization of the soft switch, and the increased value refers to the proposed design method; the equivalent alternating-current impedance of the compensation topological load of the improved capacitor filtering rectifier bridge is almost zero, and parameters can be designed according to a formula (2). Therefore, the system compensation parameter design adopting the improved capacitor filter rectifier bridge is simpler and more convenient.
Figure BDA0002939175030000091
TABLE 4
Figure BDA0002939175030000092
Fig. 13 to 16 are experimental results comparing the input impedance angle, output current, system efficiency, system output and waveform distortion degree of the rectifier between the improved capacitor filter rectifier bridge and the conventional rectifier bridge, respectively. The system efficiency is the overall efficiency from the direct current input side to the direct current output side, and includes the loss of the inverter and the loss of the rectifier bridge, so whether the soft switch is realized or not plays an important role in the efficiency, and the size of the input impedance angle of the rectifier has a great influence.
As can be seen from fig. 13 to 17, the improved capacitor filter rectifier bridge can effectively reduce the input impedance angle of the rectifier, and change the inductive impedance of the conventional rectifier bridge under operation to be close to resistive; the transmission efficiency of the system is obviously improved by 0.45% under the condition of light load and 0.6% under the condition of heavy load; the fluctuation of the output current of the system along with the change of the load is reduced, and the fluctuation amount of the output current under the traditional rectifier bridge is reduced to 0.272A; the phenomenon that the duty ratio of the input voltage of the rectifier bridge is lost when the load resistance value is large is eliminated.
In summary, the improved capacitor filter rectifier bridge obtained by the improved method of the capacitor filter bridge type uncontrolled rectifier provided by the invention has ideal rectifier input impedance property. Compared with the traditional bridge capacitor filter rectifying circuit, the input impedance angle of the rectifier in the discontinuous mode is obviously reduced, the transmission efficiency of the system is improved, the constant output capacity of the system irrelevant to the load is enhanced, the distortion of input voltage and current is eliminated, and the performances of the system in all aspects are improved. The method provided by the invention almost has no extra cost, is simple in implementation mode, stable and reliable in performance, and has wide application prospect in the field of power electronic converters.
Although the invention herein has been described with reference to particular embodiments, it is to be understood that these embodiments are merely illustrative of the principles and applications of the present invention. It is therefore to be understood that numerous modifications may be made to the illustrative embodiments and that other arrangements may be devised without departing from the spirit and scope of the present invention as defined by the appended claims. It should be understood that features described in different dependent claims and herein may be combined in ways different from those described in the original claims. It is also to be understood that features described in connection with individual embodiments may be used in other described embodiments.

Claims (5)

1. An improved method of a capacitor filter bridge type uncontrolled rectifier is based on a traditional capacitor filter rectifier bridge and is characterized in that an auxiliary capacitor C is connected in parallel between two input ends of the rectifier bridgeAdObtaining an improved capacitor filter rectifier bridge;
the auxiliary capacitor CAdWhen the load resistance value is too large and the rectifier bridge works in an intermittent conduction mode, the input current is provided with continuityA current loop, making the input current non-zero;
the conventional capacitor filter rectifier bridge comprises a rectifier diode D1Rectifier diode D2Rectifier diode D3Rectifier diode D4And a filter capacitor CF；
Rectifier diode D1Is connected to one input of a rectifier bridge, a rectifier diode D1Cathode of (2) is connected with a rectifier diode D3Cathode of (2), rectifier diode D3Anode of (2) is connected with a rectifier diode D4Cathode of (2), rectifier diode D4Anode of (2) is connected with a rectifier diode D2Anode of (2), rectifier diode D2Cathode of (2) is connected with a rectifier diode D1Anode of (2), rectifier diode D4The cathode of the rectifier bridge is connected with the other input end of the rectifier bridge;
filter capacitor CFIs connected to a rectifier diode D3Cathode and rectifier diode D4Between the anodes of (1), a filter capacitor CFEquivalent resistance R of parallel loadL。
2. The improved method of claim 1, wherein said step of providing a capacitor-filtered bridge-type uncontrolled rectifier,
the auxiliary capacitor CAdThe values of (a) are obtained by simulation experiments.
3. The improved method of claim 1, wherein said step of providing a capacitor-filtered bridge-type uncontrolled rectifier,
in an IPT system based on an S/S compensation topology and an improved capacitor filter rectifier bridge, when the load resistance value is between 1 and 100 omega, the auxiliary capacitor C is usedAdUnder different values, the auxiliary capacitor C is selected according to the curve that the input impedance angle and the output current of the rectifier bridge change along with the resistance value of the loadAdThe values of (A) are as follows: cAd＝2.5nF。
4. The improved method of claim 1, wherein said step of providing a capacitor-filtered bridge-type uncontrolled rectifier,
in LCC/S-based complementationIn the IPT system of the compensated topology and the improved capacitor filter rectifier bridge, when the load resistance value is between 1 and 100 omega, the auxiliary capacitor C is usedAdUnder different values, the auxiliary capacitor C is selected according to the curve that the input impedance angle and the output voltage of the rectifier bridge change along with the resistance value of the loadAdThe values of (A) are as follows: cAd＝2.5nF。
5. The improved method of claim 1, wherein said step of providing a capacitor-filtered bridge-type uncontrolled rectifier,
in an IPT system based on an LCC/LCC compensation topology and an improved capacitor filter rectifier bridge, when the load resistance value is between 1 and 100 omega, the load resistance value is determined according to an auxiliary capacitor CAdUnder different values, the auxiliary capacitor C is selected according to the curve that the input impedance angle and the output current of the rectifier bridge change along with the resistance value of the loadAdThe values of (A) are as follows: cAd＝7nF。
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