CN113572362A - Voltage-sharing capacitor regulator for input series structure and control method thereof - Google Patents

Voltage-sharing capacitor regulator for input series structure and control method thereof Download PDF

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Publication number
CN113572362A
CN113572362A CN202110849483.2A CN202110849483A CN113572362A CN 113572362 A CN113572362 A CN 113572362A CN 202110849483 A CN202110849483 A CN 202110849483A CN 113572362 A CN113572362 A CN 113572362A
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voltage
sharing
series
circuit
capacitor
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CN202110849483.2A
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CN113572362B (en
Inventor
何志兴
肖子衡
罗安
汪亮
李宗鉴
管仁锋
高兵
肖雨
段承君
侯仁杰
周奔
陈燕东
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Hunan University
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Hunan University
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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
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
    • 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
    • H02M1/32—Means for protecting converters other than automatic disconnection
    • 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
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
    • H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
    • 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
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
    • H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
    • H02M7/5388—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with asymmetrical configuration of switches

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)

Abstract

The invention discloses a voltage-sharing capacitor regulator for an input series structure and a control method thereof, wherein the voltage-sharing capacitor regulator comprises a plurality of voltage-sharing capacitors, and two adjacent voltage-sharing capacitors are connected through a voltage-sharing unit; the voltage-sharing unit comprises two voltage-sharing branches connected in parallel; the first voltage-sharing branch comprises a first inverter circuit, a first resonance circuit, a first high-frequency transformer and a first rectification circuit which are connected in sequence; the second voltage-sharing branch comprises a second rectifying circuit, a second high-frequency transformer, a second resonance circuit and a second inverter circuit which are connected in sequence; one ends of the first inverter circuit and the second rectifying circuit are connected with the first voltage-sharing capacitor; one end of the first rectifying circuit and one end of the second inverter circuit are connected with the second voltage-sharing capacitor. The invention solves the problems that the bypass impact current is overlarge when self energy is taken, the sub-module controller cannot send sub-module state information to the main controller after the voltage-sharing capacitor is powered down, the bypass switch malfunctions after the voltage-sharing capacitor is powered down, and the voltage of the voltage-sharing capacitor is diffused when the voltage-sharing capacitor is started.

Description

Voltage-sharing capacitor regulator for input series structure and control method thereof
Technical Field
The invention relates to the technical field of power electronics, in particular to a voltage-sharing capacitor regulator for an input series structure and a control method thereof.
Background
In industrial power distribution networks with high power, high voltage input and low voltage output, new energy power generation, submarine observation network power supply systems and electrified railway occasions, the high voltage direct current converter is one of key devices for realizing power transmission. A single converter is difficult to withstand the input high voltage due to the voltage stress of the power switches. A dc converter commonly used in such a case adopts an input-series-output parallel structure. The input-series output-parallel direct current converter is formed by connecting a plurality of sub-modules in series at an input end and in parallel at an output end. The energy taking and driving circuit in the submodule usually adopts a self-energy taking mode to take electricity on a voltage-sharing capacitor at an input end through an auxiliary power supply. Although the self-energy-taking method is simple and economical, the self-energy-taking method has the following problems: 1) the bypass of the sub-module with the fault is difficult, and the bypass can generate a very large capacitance discharge current instantly, so that the fault is not easy to clear quickly. 2) The sub-module controller cannot send sub-module state information to the main controller due to the fact that the auxiliary power supply is powered down due to communication faults or conditions such as self-bypass of the sub-module. 3) Due to the fact that the drive of the control bypass switch is powered down, the bypass switch can be closed again, and a fault sub-module is put into operation. 4) When the voltage-sharing capacitor is started, the voltage-sharing capacitor is enabled to be diverged due to the fact that the auxiliary power supply has the property of a constant power source.
If the self-energy-taking mode is not adopted, the external power supply energy-taking mode is needed. The energy taking mode adopting external power supply needs a high-insulation auxiliary power supply (high insulation requirement), the high-insulation auxiliary power supply does not have mature commercial products, the customization price is high, in order to ensure the reliability of the energy taking mode adopting external power supply, an uninterruptible power supply is often additionally configured, and the energy taking cost is further improved.
Disclosure of Invention
The invention aims to solve the technical problems that a voltage-sharing capacitor regulator for an input series structure and a control method thereof are provided aiming at the defects of the prior art, a high-insulation auxiliary power supply is not needed, and the problems that the bypass impact current is too large when self energy is taken, a sub-module controller cannot send sub-module state information to a main controller after the voltage-sharing capacitor is powered down, a bypass switch malfunctions after the voltage-sharing capacitor is powered down, and the voltage of the voltage-sharing capacitor is diffused when the voltage-sharing capacitor is started are solved.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: a voltage-sharing capacitor regulator for an input series structure comprises a plurality of voltage-sharing capacitors, wherein two adjacent voltage-sharing capacitors are connected through a voltage-sharing unit; the voltage equalizing unit comprises at least two voltage equalizing regulators connected in series; the first series voltage-sharing regulator of the first voltage-sharing unit comprises a first inverter circuit, a first resonance circuit, a first high-frequency transformer and a first rectification circuit which are connected in sequence; the second series voltage-sharing regulator of the first voltage-sharing unit comprises a second rectifying circuit, a second high-frequency transformer, a second resonant circuit and a second inverter circuit which are connected in sequence; the first rectifying circuit is connected with the second inverter circuit; the second rectifying circuit is connected with the first inverter circuit; the first inverter circuit and the second rectifying circuit are respectively connected with two ends of the first voltage-sharing capacitor; one ends of the first rectifying circuit and the second inverting circuit are respectively connected with two ends of the second voltage-sharing capacitor; a first inverter circuit and a second rectifying circuit of the second voltage-sharing unit are respectively connected with two ends of a second voltage-sharing capacitor; a first rectifying circuit and a second inverting circuit of the second voltage-sharing unit are respectively connected with two ends of a third voltage-sharing capacitor; and so on.
According to the invention, a plurality of voltage-sharing capacitor regulators are respectively connected between adjacent voltage-sharing capacitors, so that the voltages of two adjacent voltage-sharing capacitors are balanced, and the voltage-sharing capacitors input by the sub-module cannot be powered down along with the bypass of the sub-module, thereby solving the problem that the auxiliary power supply is powered down due to communication failure or self-bypass of the sub-module and the like in a self-energy-obtaining mode, and the sub-module controller cannot send the state information of the sub-module to the main controller; when the sub-module needs to be bypassed, the bypass switch can be directly closed without impulse current; after the bypass, the bypass switch can not be closed again, and the fault submodule is put into use; the potential risk that the voltage of the voltage-sharing capacitor is diffused by an auxiliary power supply during starting is also solved; the voltage-sharing capacitor regulator (namely the series voltage-sharing regulator) does not use a high-insulation auxiliary power supply, and adopts the self-redundancy backup of the voltage-sharing capacitor regulator to replace an additionally configured uninterrupted power supply in an energy taking mode of external power supply, so that the energy taking cost is reduced. In order to further reduce the energy taking cost, the inverter circuit in the voltage equalizing unit is an asymmetric half-bridge circuit, a symmetric half-bridge circuit or a full-bridge circuit.
The high-frequency transformer in the voltage-sharing unit is a step-down transformer, the transformation ratio is 1: n, and n is less than 1. n is 0.8-0.9.
For any series voltage-sharing regulator, the rectifying circuit comprises a first diode, a second diode, a third diode and a fourth diode; the first diode, the second diode, the third diode and the fourth diode are sequentially connected in series; and the anode of the first diode is connected with one end of the secondary winding of the high-frequency transformer, and the cathode of the fourth diode is connected with the other end of the secondary winding of the high-frequency transformer.
The invention also provides a control method of the voltage-sharing capacitance regulator, which comprises the following steps: when the input voltages of two series voltage-sharing regulators between two adjacent voltage-sharing capacitors, namely the ith voltage-sharing capacitor and the (i + 1) th voltage-sharing capacitor, are higher than a threshold value N, the two series voltage-sharing regulators do not work; when the input voltage of the first series voltage-sharing regulator is lower than a threshold value N, the first series voltage-sharing regulator starts to work, and energy is transferred from the (i + 1) th voltage-sharing capacitor to the (i) th voltage-sharing capacitor; and when the input voltage of the second series voltage-sharing regulator is lower than the threshold value N, the second series voltage-sharing regulator starts to work, and energy is transferred from the ith voltage-sharing capacitor to the (i + 1) th voltage-sharing capacitor.
The threshold N is N times the input voltage of the series voltage equalizer.
Compared with the prior art, the invention has the beneficial effects that: according to the invention, a plurality of voltage-sharing capacitor regulators are respectively connected between adjacent voltage-sharing capacitors, so that the voltages of two adjacent voltage-sharing capacitors are balanced, and the voltage-sharing capacitors input by the sub-module cannot be powered down along with the bypass of the sub-module, thereby solving the problem that the auxiliary power supply is powered down due to communication failure or self-bypass of the sub-module and the like in a self-energy-obtaining mode, and the sub-module controller cannot send the state information of the sub-module to the main controller; when the sub-module needs to be bypassed, the bypass switch can be directly closed without impulse current; after the bypass, the bypass switch can not be closed again, and the fault submodule is put into use; the potential risk that the voltage of the voltage-sharing capacitor is diverged by the auxiliary power supply during starting is also solved. Compared with an external power supply energy taking mode, the voltage-sharing capacitor regulator does not need a high-insulation transformer, is relatively low in price, and can be directly used for redundancy backup without additionally configuring an uninterruptible power supply, so that the energy taking cost is reduced.
Drawings
FIG. 1 is a general block diagram of the topology of the present invention;
FIG. 2 is an inverter circuit of the topology of the present invention;
FIGS. 3(a) and 3(b) are high frequency transformers in the topology of the present invention; fig. 3(a) is a high frequency transformer without a center tap, and fig. 3(b) is a high frequency transformer with a center tap;
FIG. 4 is a resonant circuit in the topology of the present invention;
5(a) -5 (d) are circuit diagrams of specific embodiments, taking two sub-modules and two voltage-sharing capacitance regulators as examples;
FIG. 5(a) shows a series voltage-sharing regulator M1And M2Input voltages are all higher than threshold value, and a voltage-equalizing regulator M is connected in series1And M2Embodiments in which none are working;
FIG. 5(b) shows a series voltage-sharing regulator M1When the input voltage is lower than the threshold value, the voltage-sharing capacitor C2By means of a series-connected voltage-equalizing regulator M1To voltage-sharing capacitor C1An embodiment for delivering energy;
FIG. 5(c) shows a series voltage-sharing regulator M2When the input voltage is lower than the threshold value, the voltage-sharing capacitor C1By means of a series-connected voltage-equalizing regulator M2To voltage-sharing capacitor C2An embodiment for delivering energy;
FIG. 5(d) is a diagram of an input voltage-sharing capacitor C1Bypass rear voltage-sharing capacitor C2By means of a series-connected voltage-equalizing regulator M1To voltage-sharing capacitor C1An embodiment for delivering energy;
FIG. 6 is an embodiment of the connection scheme of FIG. 1 added to N sub-modules;
FIGS. 7(a) -7 (e) show the two sub-modules and the two series voltage regulators M of FIG. 51And M2The simulated waveform of (2);
in FIG. 7(a), two auxiliary power supplies A1And A2Are all set to 10W;
in FIG. 7(b), two auxiliary power supplies A1And A2Are set to 12.5W and 10W, respectively;
in FIG. 7(c), two auxiliary power supplies A1And A2Are set to 20W and 10W, respectively;
in FIG. 7(d), two auxiliary power supplies A1And A2Are set to 10W and 20W, respectively;
in FIG. 7(e), two auxiliary power supplies A1And A2Are set to 10W and 0W, respectively.
Detailed Description
The invention is further described with reference to the following figures and specific embodiments. The invention provides a voltage-sharing capacitor regulator for an input series structure and a control method thereof. As shown in fig. 1, it includes: the circuit comprises an inverter circuit, a resonance circuit, a high-frequency transformer and a rectification circuit. The input end of the inverter circuit is connected to two ends of a voltage-sharing capacitor, and the output end of the rectifier circuit is connected to two ends of the voltage-sharing capacitor adjacent to the inverter circuit.
The invention is characterized in that the voltage of two adjacent voltage-sharing capacitors is balanced by the voltage-sharing capacitor regulator; when the sub-module needs to be bypassed, the bypass switch can be directly closed without impulse current; after the bypass switch is closed, the sub-module controller can always send state information to the main controller, and the reliability of the system is greatly improved.
The inverter circuit shown in fig. 1 is shown in fig. 2, and the inverter circuit may be an asymmetric half-bridge circuit, a symmetric half-bridge circuit, a full-bridge circuit, or the like. The asymmetric half-bridge circuit comprises two power switch tubes, and the output of an inversion port AB is DC biased to VinA/2, amplitude of VinIs applied to the square wave voltage. The symmetrical half-bridge circuit comprises two power switch tubes and two DC voltage-dividing capacitors, the output of the inversion port AB is DC-free, and the amplitude is VinIs applied to the square wave voltage. The full-bridge circuit comprises four power switch tubes, the output of an inversion port AB is zero direct current bias, and the amplitude is 2VinIs applied to the square wave voltage. The power switch tube can be a semiconductor electronic switch such as an IGBT, a GTR, a GTO, a MOSFET and the like.
The high frequency transformer shown in fig. 1 is shown in fig. 3(a) and 3(b), and the high frequency transformer may or may not have a center tap. A high frequency transformer without a center tap is shown in fig. 3(a), and a high frequency transformer with a center tap is shown in fig. 3 (b).
The resonant circuit shown in fig. 1 is shown in fig. 4. The resonant circuit includes a resonant inductor and a resonant capacitor connected in series.
Based on fig. 1, taking two sub-modules and two voltage-sharing capacitance regulators as an example, the specific embodiment is as follows:
FIG. 5(a) shows a series voltage-sharing regulator M1And M2Input voltages are all higher than threshold value, and a voltage-equalizing regulator M is connected in series1And M2Embodiments in which none are working;
FIG. 5(b) shows a series voltage-sharing regulator M1When the input voltage is lower than the threshold value, the voltage-sharing capacitor C2By means of a series-connected voltage-equalizing regulator M1To voltage-sharing capacitor C1An embodiment for delivering energy;
FIG. 5(c) shows a series voltage-sharing regulator M2When the input voltage is lower than the threshold value, the voltage-sharing capacitor C1By means of a series-connected voltage-equalizing regulator M2To voltage-sharing capacitor C2An embodiment for delivering energy;
FIG. 5(d) is a diagram of an input voltage-sharing capacitor C1Bypass rear voltage-sharing capacitor C2By means of a series-connected voltage-equalizing regulator M1To voltage-sharing capacitor C1An embodiment for delivering energy;
FIG. 6 is an embodiment of the connection scheme of FIG. 1 added to N sub-modules;
in addition to the embodiments of fig. 2-6, other embodiments using the connection of fig. 1 are also within the scope of the present invention.
The two sub-modules shown in FIGS. 5(a) to 5(d) and the two series voltage regulators M are used here1And M2For example, the working principle of the invention is introduced: input voltage-sharing capacitor C1And an anti-reverse diode D1Connected in series and then connected with a bypass switch S1Parallel connection; input voltage-sharing capacitor C2And an anti-reverse diode D2Connected in series and then connected with a bypass switch S2And (4) connecting in parallel. Two bypass switches S1And S2Are connected in series. Series voltage regulator M1Input end and input voltage-sharing capacitor C2Connected with the output end of the voltage-sharing capacitor C1Connecting; series voltage regulator M2Input end and input voltage sharingContainer C1Connected with the output end of the voltage-sharing capacitor C2Are connected. Series voltage regulator M1And M2The inverter circuits in the inverter circuit adopt four power switch tubes to form a full-bridge circuit. Series voltage regulator M1And M2The two resonant circuits in the circuit are identical in structure and are both provided with a resonant inductor LrAnd a resonance capacitor CrAre connected in series. The high-frequency transformer adopts a structure without a center tap, and the transformation ratio is 1: 0.9. The rectification circuits all adopt a full-bridge rectification structure.
FIGS. 7(a) -7 (e) show the two sub-modules and the two series voltage regulators M of FIG. 51And M2The simulation parameters are designed as follows:
input voltage Vin200V, input voltage-sharing capacitor C1And C2Has a capacity value of 220 muF, and is connected with a voltage-sharing regulator M1And M2In the resonant inductor is Lr7.5 muH, resonance capacitance Cr342 nF. The transformation ratio of the high-frequency transformer is 1:0.9, and the excitation inductance is Lm＝4mH。M1And M2The resonant current flowing through the resonant inductor is denoted as Ir1And Ir2The voltage on the resonant capacitor is denoted as Vr1And Vr2The output currents are respectively marked as Io1And Io2. Auxiliary power supply A1And A2May be 0W (auxiliary power supply not operating), 10W, 12.5W or 20W. Series voltage-sharing regulator M1And M2The switching frequency of the power switching tube in the device is 100kHz, the duty ratio is 0.5, and the open loop control is carried out.
In FIG. 7(a), two auxiliary power supplies A1And A2Are respectively set to 10W, and then an input voltage-sharing capacitor C1Voltage V ofin1Input voltage-sharing capacitor C2Voltage V ofin2Are all 100V and are connected in series with a voltage-sharing regulator M1And M2All do not work, resonant current Ir1And Ir2All are triangular waves with amplitude of 0.15A, resonance voltage Vr1And Vr2Is 1.5V sine wave, and outputs current Io1And Io2Are all 0.
In FIG. 7(b), twoAuxiliary power supply A1And A2Is set to 12.5W and 10W respectively, and then the input voltage-sharing capacitor C1Voltage V ofin1Input voltage-sharing capacitor C2Voltage V ofin2105.5V and 94.5V, respectively, series voltage-sharing regulator M1Work M2When not in work, the energy is input into the voltage-sharing capacitor C2Energy transfer to input voltage-sharing capacitor C1Output current Io2The peak value of (a) was 0.2A. The speed of energy transfer is two auxiliary power supplies A1And A2The power difference of 2.5W.
In FIG. 7(c), two auxiliary power supplies A1And A2Is set to 20W and 10W respectively, and the input voltage equalizing capacitor C1Voltage V ofin1Input voltage-sharing capacitor C2Voltage V ofin2105.5V and 94.5V, respectively, series voltage-sharing regulator M1Work M2When not in work, the energy is input into the voltage-sharing capacitor C2Energy transfer to input voltage-sharing capacitor C1Output current Io2The peak value of (a) was 0.8A. The speed of energy transfer is two auxiliary power supplies A1And A2The power difference of 10W.
In FIG. 7(d), two auxiliary power supplies A1And A2Is set to 10W and 20W respectively, and the input voltage equalizing capacitor C1Voltage V ofin1Input voltage-sharing capacitor C2Voltage V ofin294.5V and 105.5V, respectively, series voltage-sharing regulator M2Work M1When not in work, the energy is input into the voltage-sharing capacitor C1Energy transfer to input voltage-sharing capacitor C2Output current Io1The peak value of (a) was 0.8A. The speed of energy transfer is two auxiliary power supplies A1And A2The power difference of 10W.
In FIG. 7(e), two auxiliary power supplies A1And A2Is set to 10W and 0W respectively, and the input voltage-sharing capacitor C1Voltage V ofin1Input voltage-sharing capacitor C2Voltage V ofin2105.5V and 94.5V, respectively, series voltage-sharing regulator M1Work M2When not in work, the energy is input into the voltage-sharing capacitor C2Energy transfer to input voltage-sharing capacitor C1Output current Io2The peak value of (a) was 0.8A. The speed of energy transfer is two auxiliary power supplies A1And A2The power difference of 10W.
As can be seen from the simulation results of fig. 7(a) to 7(e), the two auxiliary power supplies a1And A2When the power of the two voltage-sharing capacitors is the same, the voltages of the two input voltage-sharing capacitors are naturally balanced, and the two voltage-sharing capacitors are connected in series to form a voltage-sharing regulator M1And M2All do not work. At two auxiliary power supplies A1And A2When the power of the two input voltage-sharing capacitors is different, the voltage of the two input voltage-sharing capacitors begins to deviate, and when the two input voltage-sharing capacitors are connected in series, the voltage-sharing regulators M are connected1Or M2Series voltage-equalizing regulator M when voltage reaches threshold value1Or M2And starting to work, when the voltage of the two input capacitors is finally stabilized, although a small steady-state error exists, the steady-state error value is related to the transformation ratio of the high-frequency transformer, and the closer the transformation ratio is to 1, the smaller the steady-state error is.

Claims (7)

1. A voltage-sharing capacitor regulator for an input series structure is characterized by comprising a plurality of voltage-sharing capacitors, wherein two adjacent voltage-sharing capacitors are connected through a voltage-sharing unit; the voltage equalizing unit comprises at least two voltage equalizing regulators connected in series; the first series voltage-sharing regulator of the first voltage-sharing unit comprises a first inverter circuit, a first resonance circuit, a first high-frequency transformer and a first rectification circuit which are connected in sequence; the second series voltage-sharing regulator of the first voltage-sharing unit comprises a second rectifying circuit, a second high-frequency transformer, a second resonant circuit and a second inverter circuit which are connected in sequence; the first rectifying circuit is connected with the second inverter circuit; the second rectifying circuit is connected with the first inverter circuit; the first inverter circuit and the second rectifying circuit are respectively connected with two ends of the first voltage-sharing capacitor; one ends of the first rectifying circuit and the second inverting circuit are respectively connected with two ends of the second voltage-sharing capacitor; a first inverter circuit and a second rectifying circuit of the second voltage-sharing unit are respectively connected with two ends of a second voltage-sharing capacitor; a first rectifying circuit and a second inverting circuit of the second voltage-sharing unit are respectively connected with two ends of a third voltage-sharing capacitor; and so on.
2. The voltage-sharing capacitor regulator for input series configuration according to claim 1, wherein the inverter circuit in the voltage-sharing unit is an asymmetric half-bridge circuit, a symmetric half-bridge circuit or a full-bridge circuit.
3. The input series arrangement of voltage-sharing capacitance regulators according to claim 1, wherein the high frequency transformer in the voltage-sharing unit is a step-down transformer with a transformation ratio of 1: n, n < 1.
4. The voltage-sharing capacitance regulator for the input series structure as claimed in claim 3, wherein n is 0.8-0.9.
5. The voltage-sharing capacitance regulator for input series configuration according to claim 1, wherein, for any one of the series voltage-sharing regulators, the rectifying circuit thereof comprises a first diode, a second diode, a third diode and a fourth diode; the first diode, the second diode, the third diode and the fourth diode are sequentially connected in series; and the anode of the first diode is connected with one end of the secondary winding of the high-frequency transformer, and the cathode of the fourth diode is connected with the other end of the secondary winding of the high-frequency transformer.
6. A method for controlling a voltage-sharing capacitance regulator according to any one of claims 1 to 5, characterized in that the method comprises: when the input voltages of two series voltage-sharing regulators between two adjacent voltage-sharing capacitors, namely the ith voltage-sharing capacitor and the (i + 1) th voltage-sharing capacitor, are higher than a threshold value N, the two series voltage-sharing regulators do not work; when the input voltage of the first series voltage-sharing regulator is lower than a threshold value N, the first series voltage-sharing regulator starts to work, and energy is transferred from the (i + 1) th voltage-sharing capacitor to the (i) th voltage-sharing capacitor; and when the input voltage of the second series voltage-sharing regulator is lower than the threshold value N, the second series voltage-sharing regulator starts to work, and energy is transferred from the ith voltage-sharing capacitor to the (i + 1) th voltage-sharing capacitor.
7. The method of claim 6, wherein the threshold N is N times the input voltage of the series voltage equalizer.
CN202110849483.2A 2021-07-27 2021-07-27 Voltage-sharing capacitor regulator for input series structure and control method thereof Active CN113572362B (en)

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