CN112039348A - AC/DC rectifier, DC/AC inverter, DC/DC converter, and uninterruptible power supply - Google Patents

AC/DC rectifier, DC/AC inverter, DC/DC converter, and uninterruptible power supply Download PDF

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Publication number
CN112039348A
CN112039348A CN202010928745.XA CN202010928745A CN112039348A CN 112039348 A CN112039348 A CN 112039348A CN 202010928745 A CN202010928745 A CN 202010928745A CN 112039348 A CN112039348 A CN 112039348A
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China
Prior art keywords
pulse width
inverter
width modulated
rectifier
bus
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CN202010928745.XA
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Chinese (zh)
Inventor
胡高宏
曹磊
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Santak Electronic Shenzhen Co Ltd
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Santak Electronic Shenzhen Co Ltd
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Priority to CN202010928745.XA priority Critical patent/CN112039348A/en
Publication of CN112039348A publication Critical patent/CN112039348A/en
Priority to TW110133028A priority patent/TW202211599A/en
Pending legal-status Critical Current

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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
    • H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
    • H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
    • H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
    • H02M5/44—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
    • H02M5/453—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M5/458—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M5/4585—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only having a rectifier with controlled 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
    • H02M1/12—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
    • H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac 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
    • H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac 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
    • H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac 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 with automatic control of output voltage or current, e.g. switching regulators
    • H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac 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 with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
    • H02M3/1584—Conversion of dc power input into dc power output without intermediate conversion into ac 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 with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load with a plurality of power processing stages connected in parallel
    • 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
    • H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
    • H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
    • H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/21—Conversion of ac power input into dc 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
    • H02M7/217—Conversion of ac power input into dc 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
    • 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
    • H02M7/539—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 with automatic control of output wave form or frequency
    • H02M7/5395—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 with automatic control of output wave form or frequency by pulse-width modulation

Abstract

The invention provides an AC/DC rectifier, a DC/AC inverter, a DC/DC converter and an uninterruptible power supply, wherein the AC/DC rectifier comprises: the input end of each pulse width modulation rectification circuit is connected to the alternating current input end, and the output end of each pulse width modulation rectification circuit is connected to the positive direct current bus and the negative direct current bus; a filter capacitor connected between the AC input terminal and a neutral point; and a control unit for providing a plurality of pulse width modulation signals to a corresponding plurality of switching transistors in the same plurality of pulse width modulation rectification circuits; wherein the plurality of pulse width modulated signals have a phase difference therebetween. According to the invention, part of high-frequency ripple currents generated in the working process of the AC/DC rectifier, the DC/AC inverter, the DC/DC converter or the uninterruptible power supply are mutually offset, so that the filter capacitor filters less high-frequency ripple currents.

Description

AC/DC rectifier, DC/AC inverter, DC/DC converter, and uninterruptible power supply
Technical Field
The invention relates to the field of electric lines, in particular to an AC/DC rectifier, a DC/AC inverter, a DC/DC converter and an uninterruptible power supply.
Background
Fig. 1 is a circuit block diagram of an uninterruptible power supply in the prior art. As shown in fig. 1, the uninterruptible power supply 1 includes an AC/DC rectifier 11, a DC/DC converter 12, and a DC/AC inverter 14, wherein an input terminal of the AC/DC rectifier 11 is connected to an alternating current input terminal Vi, and an output terminal thereof is connected to a positive direct current bus 131 and a negative direct current bus 132; the input end of the DC/AC inverter 14 is connected to the positive DC bus 131 and the negative DC bus 132, and the output end thereof is connected to the AC output Vo; the DC/DC converter 12 has an input terminal connected to the rechargeable battery B1 and an output terminal connected to the positive DC bus 131 and the negative DC bus 132. The ups 1 further includes a filter capacitor C11 connected to the input of the AC/DC rectifier 11, a filter capacitor C12 connected to the input of the DC/DC converter 12, and a filter capacitor C14 connected to the output of the DC/AC inverter 14.
When the control device (not shown in fig. 1) controls the AC/DC rectifier 11, the DC/DC converter 12 or the DC/AC inverter 14 to operate, the filter capacitor C11 is used for filtering the high-frequency ripple current generated by the AC/DC rectifier 11, the filter capacitor C12 is used for filtering the high-frequency ripple current generated by the DC/DC converter 12, and the filter capacitor C14 is used for filtering the high-frequency ripple current generated by the DC/AC inverter 14.
However, the conventional uninterruptible power supply 1 has the following disadvantages: (1) the larger high-frequency ripple current generated by the AC/DC rectifier 11 during operation causes the filter capacitor C11 to generate more heat, which reduces the lifetime of the filter capacitor C11; (2) the larger high-frequency ripple current generated by the DC/DC converter 12 during operation causes the filter capacitor C12 to generate more heat, which reduces the lifetime of the filter capacitor C12; (3) the larger high-frequency ripple current generated by the DC/AC inverter 14 during operation causes the filter capacitor C14 to generate more heat, which reduces the lifetime of the filter capacitor C14; (4) the rated power of the uninterrupted power supply is smaller.
In order to effectively filter the high-frequency ripple current, a filter capacitor with a large capacitance value is usually required. However, the filter capacitor with a large capacitance is expensive and bulky.
Disclosure of Invention
In view of the above technical problems in the prior art, the present invention provides an AC/DC rectifier, including:
the input end of each pulse width modulation rectification circuit is connected to the alternating current input end, and the output end of each pulse width modulation rectification circuit is connected to the positive direct current bus and the negative direct current bus;
a filter capacitor connected between the AC input terminal and a neutral point; and
a control unit for providing a plurality of pulse width modulation signals to a corresponding plurality of switching transistors in the same pulse width modulation rectification circuits;
wherein the plurality of pulse width modulated signals have a phase difference therebetween.
Preferably, the control unit is configured to provide a plurality of pulse width modulation carrier signals having phase differences to a corresponding plurality of switching transistors in the same pulse width modulation rectification circuits, and compare the plurality of pulse width modulation carrier signals with the same modulation signal to provide the plurality of pulse width modulation signals.
Preferably, the phase difference between any two of the pulse width modulated carrier signals is 360 ° divided by the number of the identical pulse width modulated rectifier circuits.
Preferably, the number of the plurality of identical pulse width modulation rectification circuits is three, and the phase difference between any two of the plurality of pulse width modulation carrier signals is 120 °.
Preferably, each of the pulse width modulation rectification circuits includes: a first capacitor and a second capacitor connected in series between the positive DC bus and the negative DC bus, the first capacitor and the second capacitor being connected to a neutral point; the first switching transistor and the second switching transistor are sequentially connected between the positive direct current bus and the negative direct current bus, and the first switching transistor and the second switching transistor are connected to form a first node; a third switching transistor and a fourth switching transistor connected between the first node and a neutral point; and an inductor connected between the first node and the ac input terminal.
The present invention provides a DC/AC inverter, comprising:
the inverter comprises a plurality of identical inverter circuits connected in parallel, wherein the input end of each inverter circuit is connected to a positive direct current bus and a negative direct current bus, and the output end of each inverter circuit is connected to an alternating current output end;
a filter capacitor connected between the AC output terminal and a neutral point;
a control unit for providing a plurality of pulse width modulated signals to a corresponding plurality of switching transistors in the same plurality of inverter circuits;
wherein the plurality of pulse width modulated signals have a phase difference therebetween.
Preferably, the control unit is configured to provide a plurality of pulse width modulated carrier signals having phase differences to a plurality of corresponding switching transistors in the same inverter circuits, and compare the plurality of pulse width modulated carrier signals with the same modulation signal to provide the plurality of pulse width modulated signals.
Preferably, a phase difference between any two of the plurality of pulse width modulated carrier signals is 360 ° divided by the number of the plurality of identical inverter circuits.
Preferably, the number of the plurality of identical inverter circuits is three, and the phase difference between any two of the plurality of pulse width modulated carrier signals is 120 °.
Preferably, each of the inverter circuits includes: a first capacitor and a second capacitor connected in series between the positive DC bus and the negative DC bus, the first capacitor and the second capacitor being connected to a neutral point; the first switching transistor and the second switching transistor are sequentially connected between the positive direct current bus and the negative direct current bus, and the first switching transistor and the second switching transistor are connected to form a first node; a third switching transistor and a fourth switching transistor connected between the first node and a neutral point; and an inductor connected between the first node and the ac output terminal.
The present invention also provides a DC/DC converter including:
a plurality of identical DC/DC conversion circuits connected in parallel, the output ends of which are connected to the positive DC bus and the negative DC bus;
filter capacitors connected to input terminals of the plurality of identical DC/DC conversion circuits;
a control unit for supplying a plurality of pulse width modulation signals to a corresponding plurality of switching transistors in the same plurality of DC/DC conversion circuits;
wherein the plurality of pulse width modulated signals have a phase difference therebetween.
Preferably, the control unit is configured to provide a plurality of pulse width modulated carrier signals having phase differences to a plurality of corresponding switching transistors in the same DC/DC conversion circuits, and compare the plurality of pulse width modulated carrier signals with the same modulation signal to provide the plurality of pulse width modulated signals.
Preferably, a phase difference between any two of the plurality of pulse width modulated carrier signals is 360 ° divided by the number of the plurality of identical DC/DC conversion circuits.
Preferably, the number of the plurality of identical DC/DC conversion circuits is three, and the phase difference between any two of the plurality of pulse width modulated carrier signals is 120 °.
Preferably, each of the DC/DC conversion circuits includes: a first capacitor and a second capacitor connected in series between the positive DC bus and the negative DC bus, the first capacitor and the second capacitor being connected to a neutral point; the first switch transistor, the second switch transistor and the third switch transistor are sequentially connected between the positive direct current bus and the negative direct current bus, the second switch transistor is connected with the first switch transistor to form a first node, and the second switch transistor is connected with the third switch transistor to form a second node; and one end of the first inductor and one end of the second inductor are respectively connected to the first node and the second node, and the other end of the first inductor and the other end of the second inductor are connected to two ends of the filter capacitor.
The invention provides an uninterruptible power supply, which comprises:
an AC/DC rectifier as described above, the input of which is connected to the AC input;
a DC/AC inverter as described above, the input of which is connected to the output of the AC/DC rectifier; and
a DC/DC converter as described above connected between a rechargeable battery and the output of the AC/DC rectifier.
The AC/DC rectifier, the DC/AC inverter, the DC/DC converter or the uninterruptible power supply of the invention generate partial high-frequency ripple currents which are mutually offset in the working process, so that the high-frequency ripple is greatly reduced, and the filter capacitor is used for filtering less high-frequency ripple currents, has less heat generation and can be selected with a filter capacitor with smaller capacitance value and low price.
The AC/DC rectifier comprises three identical pulse width modulation rectifying circuits which are connected in parallel, wherein the phase difference of pulse width modulation signals provided by the control unit to a plurality of corresponding switching transistors in the three identical pulse width modulation rectifying circuits is 120 degrees, so that high-frequency ripple currents are mutually counteracted to the maximum extent.
The DC/AC inverter comprises three same DC/AC inverter circuits which are connected in parallel, wherein the phase difference of pulse width modulation signals provided by the control unit to a plurality of corresponding switching transistors in the three same DC/AC inverter circuits is 120 degrees, so that high-frequency ripple currents are mutually cancelled to the maximum extent.
The DC/DC converter comprises three same DC/DC conversion circuits which are connected in parallel, wherein the phase difference of pulse width modulation signals provided by the control unit to a plurality of corresponding switching transistors in the three same DC/DC conversion circuits is 120 degrees, so that high-frequency ripple currents are mutually cancelled to the maximum extent.
Drawings
Embodiments of the invention are further described below with reference to the accompanying drawings, in which:
fig. 1 is a circuit block diagram of an uninterruptible power supply in the prior art.
Fig. 2 is a circuit block diagram of an AC/DC rectifier according to a first embodiment of the present invention.
Fig. 3 is a diagram showing one specific circuit configuration of the AC/DC rectifier shown in fig. 2.
Fig. 4 is a waveform diagram of a pulse width modulated carrier signal provided to the AC/DC rectifier shown in fig. 3.
Fig. 5 is a waveform diagram of a pulse width modulated signal generated based on the pulse width modulated carrier signal shown in fig. 4.
Fig. 6 is a waveform diagram of currents of inductors in the three pulse width modulated rectifier circuits shown in fig. 3.
Fig. 7 is a circuit block diagram of a DC/AC inverter according to a first embodiment of the present invention.
Fig. 8 is a diagram showing one specific circuit configuration of the DC/AC inverter shown in fig. 7.
Fig. 9 is a circuit block diagram of a DC/DC converter according to a first embodiment of the present invention.
Fig. 10 is a diagram showing one specific circuit configuration of the DC/DC converter shown in fig. 9.
Fig. 11 is a circuit diagram of a single-phase ups according to a preferred embodiment of the invention.
Fig. 12 is a circuit block diagram of a three-phase ups according to a preferred embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail by embodiments with reference to the accompanying drawings.
Fig. 2 is a circuit block diagram of an AC/DC rectifier according to a first embodiment of the present invention. As shown in fig. 2, the AC/DC rectifier 2 ' includes a first pulse width modulation rectification circuit 21 ', a second pulse width modulation rectification circuit 22 ', and a third pulse width modulation rectification circuit 23 ' having the same circuit configuration, a filter capacitor C21 ' connected between an alternating current input terminal Vi ' and a neutral point N, and a control unit 20 '; wherein the first pulse width modulation rectification circuit 21 ', the second pulse width modulation rectification circuit 22' and the third pulse width modulation rectification circuit 23 'are connected in parallel, the input ends thereof are all connected to the alternating current input Vi', and the output ends thereof are all connected to the positive direct current bus 231 'and the negative direct current bus 232'.
The control unit 20 ' is used for providing pulse width modulation signals to the switching transistors in the first pulse width modulation rectification circuit 21 ', the second pulse width modulation rectification circuit 22 ' and the third pulse width modulation rectification circuit 23 ' to control the switching transistors to convert the alternating current at the alternating current input end Vi ' into direct current and transmit the direct current to the positive direct current bus 231 ' and the negative direct current bus 232 '.
Among them, the control unit 20 'provides phase difference between three pulse width modulation signals provided to corresponding switching transistors (i.e. switching transistors having the same connection relationship among the three pulse width modulation rectification circuits) in the first pulse width modulation rectification circuit 21', the second pulse width modulation rectification circuit 22 'and the third pulse width modulation rectification circuit 23', and preferably provides phase difference of 120 ° between any two of the three pulse width modulation signals. So that the phase difference of the high-frequency ripples in the input current I21 'of the first pulse width modulation rectification circuit 21', the input current I22 'of the second pulse width modulation rectification circuit 22', and the input current I23 'of the third pulse width modulation rectification circuit 23' is 120 °. The high-frequency ripples of the three input currents I21 ', I22' and I23 'are mutually offset, so that the high-frequency ripples filtered by the filter capacitor C21' are greatly reduced, the heat generation of the filter capacitor C21 'is reduced, the service life of the filter capacitor C21' is prolonged, and the filter capacitor with a smaller capacitance value can be selected.
Fig. 3 is a diagram showing one specific circuit configuration of the AC/DC rectifier shown in fig. 2. As shown in fig. 3, the AC/DC rectifier 2 includes a first pulse width modulation rectification circuit 21, a second pulse width modulation rectification circuit 22, and a third pulse width modulation rectification circuit 23 having the same circuit configuration, wherein the control unit is not shown in fig. 3 in order to clearly show a specific circuit connection relationship of the AC/DC rectifier 2.
The following description will be given by taking only the first pulse width modulation rectifying circuit 21 as an example. The first pwm rectifier circuit 21 is a T-type three-level circuit including: a capacitor C211 and a capacitor C212, insulated gate bipolar transistors T211, T212, T213 and T214, and an inductor L, which are connected in series between the positive DC bus 231 and the negative DC bus 232. The node formed by connecting the capacitor C211 and the capacitor C212 is connected to the neutral point N. The igbt T211 and the igbt T214 are connected between the positive dc bus 231 and the negative dc bus 232, and are connected to form a node N21. The insulated gate bipolar transistor T212 and the insulated gate bipolar transistor T213 are connected between the node N21 and the neutral point N. The inductor L21 is connected between the ac input Vi and the node N21.
The control unit (not shown in fig. 3) is configured to provide the first pulse width modulation rectifying circuit 21, the second pulse width modulation rectifying circuit 22 and the third pulse width modulation rectifying circuit 23 with a required high-frequency (for example, kilohertz level) pulse width modulation signal, so that the first pulse width modulation rectifying circuit 21, the second pulse width modulation rectifying circuit 22 and the third pulse width modulation rectifying circuit 23 operate in a pulse width modulation manner, thereby collectively converting the alternating current at the alternating current input terminal Vi into direct current and outputting the direct current to the positive direct current bus 231 and the negative direct current bus 232. The AC/DC rectifier 2 has a large power rating.
Further advantages of the AC/DC rectifier 2 will be described below by taking as an example only the pulse width modulated signals provided to the igbt T213 in the first pulse width modulated rectifier circuit 21, the igbt T223 in the second pulse width modulated rectifier circuit 22 and the igbt T233 in the third pulse width modulated rectifier circuit 23.
Fig. 4 is a waveform diagram of a pulse width modulated carrier signal provided to the AC/DC rectifier shown in fig. 3. As shown in fig. 4, the first pwm carrier signal PWMC21, the second pwm carrier signal PWMC22 and the third pwm carrier signal PWMC23 provided by the control unit are triangular waves, any two of which have a phase difference of 120 °. Since the frequency of the pulse width modulated carrier signal is much greater than the frequency of the modulation signal Mod, and fig. 4 shows only two cycles of the pulse width modulated carrier signal, the modulation signal Mod is shown in fig. 4 as a dashed and dotted line. As known to those skilled in the art, the modulation signal Mod may vary sinusoidally within the power frequency cycle.
Fig. 5 is a waveform diagram of a pulse width modulated signal generated based on the pulse width modulated carrier signal shown in fig. 4. As shown in fig. 5, the control unit compares the first PWM carrier signal PWMC21 with the modulation signal Mod to obtain the PWM signal PWM213 provided to the igbt T213 (for example, when the first PWM carrier signal PWMC21 is greater than the modulation signal Mod, the PWM signal PWM213 at a low level is obtained, and conversely, the PWM signal PWM213 at a high level is obtained); comparing the second pulse width modulation carrier signal PWMC22 with the modulation signal Mod to obtain a pulse width modulation signal PWM223 provided to the igbt T223; and compares the third pulse width modulated carrier signal PWMC23 with the modulation signal Mod to obtain the pulse width modulated signal PWM233 provided to the igbt T233. Wherein the phase difference of any two of the pulse width modulation signal PWM213, the pulse width modulation signal PWM223, and the pulse width modulation signal PWM233 is 120 °.
The corresponding other switching transistors in the first pwm rectifier circuit 21, the second pwm rectifier circuit 22 and the third pwm rectifier circuit 23 are similar to this, and are not described again here.
Fig. 6 is a waveform diagram of currents of inductors in the three pulse width modulated rectifier circuits shown in fig. 3. As shown in fig. 6, the phase difference of the high-frequency ripples of any two of the current I21 in the inductor L21, the current I22 in the inductor L22, and the current I23 in the inductor L23 is 120 °. As can be seen from fig. 6, at times t0, t1, t2, t3, t4, t5, t6, t7, t8, t9, t10, t11, t12, the sum of the high-frequency ripple currents in the current I21, the current I22, and the current I23 is about zero. At other times the sum of the high frequency ripple currents in current I21, current I22, and current I23 fluctuates up and down within a small range near zero.
Because partial high-frequency ripples in the currents I21, I22 and I23 are mutually cancelled, the high-frequency ripple at a node (which is connected to one end of the filter capacitor C21) formed by connecting the inductors L21, L22 and L23 is greatly reduced, so that the filter capacitor C21 is used for filtering less high-frequency ripple current, the heat generation is small, and the filter capacitor C21 with a small capacitance value and low price can be selected.
In another embodiment of the present invention, switching transistors such as metal oxide semiconductor field effect transistors are used instead of the insulated gate bipolar transistors in the first, second, and third pwm rectifier circuits 21, 22, 23.
In yet another embodiment of the present invention, the first, second and third pwm rectifier circuits 21, 22 and 23 share a capacitor connected between the positive dc bus 231 and the neutral point N, and a capacitor connected between the negative dc bus 232 and the neutral point N.
The first, second, and third pwm rectifier circuits 21, 22, and 23 of the present invention are not limited to T-type three-level circuits, but may be I-type three-level circuits, and other pwm circuits capable of converting ac power to dc power.
In other embodiments of the present invention, the AC/DC rectifier includes a plurality of identical pulse width modulated rectifier circuits connected in parallel between the AC input terminal and the positive and negative DC buses, wherein the control unit provides a plurality of pulse width modulated signals to a corresponding plurality of switching transistors in the plurality of identical pulse width modulated rectifier circuits, wherein the plurality of pulse width modulated signals have a phase difference. The phase difference is preferably 360 °/n, where n is the number of parallel pulse width modulated rectifier circuits to maximize the cancellation of the high frequency ripple currents.
Fig. 7 is a circuit block diagram of a DC/AC inverter according to a first embodiment of the present invention. As shown in fig. 7, the DC/AC inverter 4 ' includes a first DC/AC inverter circuit 41 ', a second DC/AC inverter circuit 42 ', and a third DC/AC inverter circuit 43 ' having the same circuit configuration, a filter capacitor C44 ' connected between the alternating current output terminal Vo ' and the neutral point N, and a control unit 40 '. Wherein the first DC/AC inverter circuit 41 ', the second DC/AC inverter circuit 42', and the third DC/AC inverter circuit 43 'are connected in parallel, input terminals thereof are connected to the positive DC bus 431' and the negative DC bus 432 ', and output terminals thereof are connected to the AC output terminal Vo'.
The control unit 40 'is configured to provide pulse width modulation signals to the switching transistors in the first DC/AC inverter circuit 41', the second DC/AC inverter circuit 42 ', and the third DC/AC inverter circuit 43', so as to control the switching transistors to convert the direct current between the positive direct current bus 431 'and the negative direct current bus 432' into alternating current, filter the high-frequency ripple through the filter capacitor C44 ', and output the high-frequency ripple to the alternating current output Vo'.
Among them, the control unit 40 'provides phase differences among the three pulse width modulation signals provided to the corresponding switching transistors (i.e., the switching transistors having the same connection relationship among the three inverter circuits) in the first DC/AC inverter circuit 41', the second DC/AC inverter circuit 42 'and the third DC/AC inverter circuit 43', and preferably provides a phase difference of 120 ° between any two of the three pulse width modulation signals. So that the phase difference of the high frequency ripples in the output current I41 'of the first DC/AC inverter circuit 41', the output current I42 'of the second DC/AC inverter circuit 42', and the output current I43 'of the third DC/AC inverter circuit 43' is 120 °. Partial high-frequency ripples of the three output currents I41 ', I42' and I43 'are mutually offset, so that the high-frequency ripples filtered by the filter capacitor C44' are greatly reduced, the heat generation of the filter capacitor C44 'is reduced, the service life of the filter capacitor C44' is prolonged, and the filter capacitor with a smaller capacitance value can be selected.
Fig. 8 is a diagram showing one specific circuit configuration of the DC/AC inverter shown in fig. 7. As shown in fig. 8, the DC/AC inverter 4 includes a first DC/AC inverter circuit 41, a second DC/AC inverter circuit 42, and a third DC/AC inverter circuit 43 having the same circuit configuration, wherein fig. 8 does not show a control unit in order to clearly show a specific circuit connection relationship of the DC/AC inverter 4. The first DC/AC inverter circuit 41, the second DC/AC inverter circuit 42, and the third DC/AC inverter circuit 43 are all T-type three-level circuits, and have the same circuit structure as the first pwm rectifier circuit 21, and are not described herein again.
The following description will also take the insulated gate bipolar transistor T413 in the first DC/AC inverter circuit 41, the insulated gate bipolar transistor T423 in the second DC/AC inverter circuit 42, and the insulated gate bipolar transistor T433 in the third DC/AC inverter circuit 43 as examples.
The control unit (not shown in fig. 8) provides the first pulse width modulated carrier signal to the igbt T413, the second pulse width modulated carrier signal to the igbt T423, and the third pulse width modulated carrier signal to the igbt T433, wherein the first pulse width modulated carrier signal, the second pulse width modulated carrier signal, and the third pulse width modulated carrier signal are triangular waves, and the phase difference between any two of them is 120 °, the waveforms of which are similar to those of fig. 4, and are not shown here.
The control unit compares the first, second and third pulse width modulated carrier signals with the same modulation signal, respectively, to obtain first, second and third pulse width modulated signals provided to the insulated gate bipolar transistors T413, T423 and T433. Wherein the phase difference of any two of the first, second and third pulse width modulated signals is 120 deg., and is similar to the waveform of the pulse width modulated signal shown in fig. 5, and is not shown here.
The control unit controls the first DC/AC inverter circuit 41, the second DC/AC inverter circuit 42 and the third DC/AC inverter circuit 43 to work, and converts the direct current between the positive direct current bus 431 and the negative direct current bus 432 into alternating current and outputs the alternating current to the alternating current output Vo. Wherein the phase difference of the high-frequency ripples of any two of the current I41 in the inductor L41, the current I42 in the inductor L42 and the current I43 in the inductor L43 is 120 deg. The waveforms of the currents I41, I42, and I43 are similar to fig. 6 and are not shown here.
Partial high-frequency ripples in the currents I41, I42 and I43 are mutually cancelled, so that the high-frequency ripple at a node (which is connected to one end of the filter capacitor C44) formed by connecting the inductors L41, L42 and L43 is greatly reduced, and therefore, the filter capacitor C44 is used for filtering less high-frequency ripple current, the heat generation is less, and the filter capacitor C44 with a smaller capacitance value and a low price can be selected.
In another embodiment of the present invention, switching transistors such as metal oxide semiconductor field effect transistors are used instead of the insulated gate bipolar transistors in the first, second, and third DC/ AC inverter circuits 41, 42, and 43.
In yet another embodiment of the present invention, the first, second and third DC/ AC inverter circuits 41, 42 and 43 share a capacitor connected between the positive DC bus 431 and the neutral point, and a capacitor connected between the negative DC bus 432 and the neutral point.
The first, second, and third DC/ AC inverter circuits 41, 42, and 43 according to the present invention are not limited to T-type three-level circuits, but may be I-type three-level circuits, and other inverters capable of converting DC power into AC power, such as full-bridge inverters or half-bridge inverters.
In other embodiments of the present invention, the DC/AC inverter includes a plurality of identical DC/AC inverter circuits connected in parallel between the positive and negative DC buses and the AC output terminal, wherein the control unit provides a plurality of pulse width modulation signals to a corresponding plurality of switching transistors in the plurality of identical DC/AC inverter circuits, wherein the plurality of pulse width modulation signals have a phase difference such that the high frequency ripple currents cancel each other. The phase difference is preferably 360/n, where n is the number of parallel DC/AC inverter circuits.
Fig. 9 is a circuit block diagram of a DC/DC converter according to a first embodiment of the present invention. As shown in fig. 9, the DC/DC converter 5 ' includes a first DC/DC conversion circuit 51 ', a second DC/DC conversion circuit 52 ', and a third DC/DC conversion circuit 53 ' having the same circuit configuration, a filter capacitor C51 ' connected in parallel with a rechargeable battery B5 ', and a control unit 50 '. The first DC/DC conversion circuit 51 ', the second DC/DC conversion circuit 52', and the third DC/DC conversion circuit 53 'are connected in parallel, input terminals thereof are connected to both ends of the filter capacitor C51', and output terminals thereof are connected to the positive DC bus 531 'and the negative DC bus 532'.
The control unit 50 ' is configured to provide high-frequency pulse width modulation signals to the switching transistors in the first DC/DC conversion circuit 51 ', the second DC/DC conversion circuit 52 ' and the third DC/DC conversion circuit 53 ', so as to control the switching transistors to convert the direct current in the rechargeable battery B5 ' into direct current and output the direct current to the positive direct current bus 531 ' and the negative direct current bus 532 '.
Among them, the control unit 50 'provides the three pulse width modulation signals to the corresponding switching transistors (i.e., the switching transistors having the same connection relationship among the three DC/DC conversion circuits) in the first DC/DC conversion circuit 51', the second DC/DC conversion circuit 52 'and the third DC/DC conversion circuit 53', with a phase difference therebetween, and preferably provides a phase difference of 120 ° between any two of the three pulse width modulation signals. Thus, the phase difference of the high-frequency ripples in the input current I51 'of the first DC/DC conversion circuit 51', the input current I52 'of the second DC/DC conversion circuit 52', and the input current I53 'of the third DC/DC conversion circuit 53' is made 120 °. Partial high-frequency ripples of the three input currents I51 ', I52' and I53 'are mutually offset, so that the high-frequency ripples filtered by the filter capacitor C51' are greatly reduced, the heat generation of the filter capacitor C51 'is reduced, the service life of the filter capacitor C51' is prolonged, and the filter capacitor with a smaller capacitance value can be selected.
Fig. 10 is a diagram showing one specific circuit configuration of the DC/DC converter shown in fig. 9. As shown in fig. 10, the DC/DC converter 5 includes a first DC/DC conversion circuit 51, a second DC/DC conversion circuit 52, and a third DC/DC conversion circuit 53 having the same circuit configuration, wherein the control unit is not shown in fig. 10 in order to clearly show a specific circuit connection relationship of the DC/DC converter 5.
Only the first DC/DC conversion circuit 51 will be described as an example. The first DC/DC conversion circuit 51 includes insulated gate bipolar transistors T511, T512, and T513, an inductor L511 and an inductor L512, and a capacitor C511 and a capacitor C512 connected in series between the positive DC bus 531 and the negative DC bus 532, which are connected in this order between the positive DC bus 531 and the negative DC bus 532. The insulated gate bipolar transistors T511 and T512 are connected to form a node N511, the insulated gate bipolar transistors T512 and T513 are connected to form a node N512, and the inductor L511 is connected between one end of the filter capacitor C51 and the node N511. Inductor L512 is connected between the other end of filter capacitor C51 and node N512.
Next, the insulated gate bipolar transistor T512 in the first DC/DC converter circuit 51, the insulated gate bipolar transistor T522 in the second DC/DC converter circuit 52, and the insulated gate bipolar transistor T532 in the third DC/DC converter circuit 53 will be described as examples.
The control unit (not shown in fig. 10) provides the first pulse width modulated carrier signal to the igbt T512, the second pulse width modulated carrier signal to the igbt T522, and the third pulse width modulated carrier signal to the igbt T532, wherein the first pulse width modulated carrier signal, the second pulse width modulated carrier signal, and the third pulse width modulated carrier signal are triangular waves, any two of which have a phase difference of 120 °, and the waveforms of which are similar to those of fig. 4 and are not shown here.
The control unit compares the first, second and third pulse width modulated carrier signals with the same modulation signal, respectively, to obtain first, second and third pulse width modulated signals provided to the insulated gate bipolar transistors T512, T522, T532. Wherein the phase difference of any two of the first, second and third pulse width modulated signals is 120 deg., and is similar to the waveform of the pulse width modulated signal shown in fig. 5, and is not shown here.
The control unit controls the first DC/DC conversion circuit 51, the second DC/DC conversion circuit 52, and the third DC/DC conversion circuit 53 to operate, and together converts the direct current in the rechargeable battery B5 into direct current and outputs the direct current to between the positive direct current bus 531 and the negative direct current bus 532. Wherein the phase difference of the high-frequency ripples of any two of the current I51 in the inductor L511, the current I52 in the inductor L521, and the current I53 in the inductor L531 is 120 °. The waveforms of current I51, current I52, and current I53 are similar to fig. 6 and are not shown here.
Partial high-frequency ripples in the current I51, the current I52 and the current I53 are mutually cancelled, so that the high-frequency ripples at a node (which is connected to one end of the filter capacitor C51) formed by connecting the inductor L511, the inductor L521 and the inductor L531 are greatly reduced, and therefore the filter capacitor C51 is used for filtering less high-frequency ripple current, the heat generation is less, and the filter capacitor C51 with a smaller capacitance value and a lower price can be selected.
In another embodiment of the present invention, switching transistors such as metal oxide semiconductor field effect transistors are used instead of the insulated gate bipolar transistors in the first, second, and third DC/ DC conversion circuits 51, 52, and 53.
In still another embodiment of the present invention, the first, second, and third DC/ DC conversion circuits 51, 52, and 53 share a capacitance connected between the positive DC bus 531 and the neutral point, and a capacitance connected between the negative DC bus 532 and the neutral point.
In other embodiments of the present invention, the first, second, and third DC/ DC conversion circuits 51, 52, and 53 may be replaced with a Boost chopper circuit, a Buck chopper circuit, or a bidirectional DC/DC converter or other conversion circuits capable of converting a direct current into a direct current.
In other embodiments of the present invention, the DC/DC converter includes a plurality of identical DC/DC conversion circuits connected in parallel, wherein the control unit supplies a plurality of pulse width modulation signals to a corresponding plurality of switching transistors in the plurality of identical DC/DC conversion circuits, wherein the plurality of pulse width modulation signals have a phase difference. The phase difference is preferably 360 °/n, where n is the number of DC/DC conversion circuits connected in parallel, to maximize the cancellation of the high-frequency ripple currents.
Fig. 11 is a circuit diagram of a single-phase ups according to a preferred embodiment of the invention. As shown in fig. 11, the single-phase uninterruptible power supply 6 includes an AC/DC rectifier 61, a DC/DC converter 62, and a DC/AC inverter 64. Wherein the input of the AC/DC rectifier 61 is connected to the AC input Vi and the output thereof is connected to the positive and negative DC busses 631, 632. The input terminal of the DC/DC converter 62 is connected to the rechargeable battery B6, and the output terminal thereof is connected to the positive and negative DC bus bars 631, 632. The input terminals of the DC/AC inverter 64 are connected to the positive and negative DC bus bars 631, 632, and the output terminals thereof are connected to the AC output Vo.
The AC/DC rectifier 61 has the same circuit structure as the AC/DC rectifier 2 ' shown in fig. 2, the DC/AC inverter 64 has the same circuit structure as the DC/AC inverter 4 ' shown in fig. 7, and the DC/DC converter 62 has the same circuit structure as the DC/DC converter 5 ' shown in fig. 9, and the specific circuit structure and operation principle of the single-phase uninterruptible power supply 6 are not described herein again.
The single-phase uninterruptible power supply 6 has a large power rating and can employ one control device including a control unit for controlling the AC/DC rectifier 61, a control unit for controlling the DC/DC converter 62, and a control unit for controlling the DC/AC inverter 64 without using multiple sets of control devices, thereby further reducing costs.
Fig. 12 is a circuit block diagram of a three-phase ups according to a preferred embodiment of the invention. As shown in fig. 12, the three-phase uninterruptible power supply 7 includes: a first AC/DC rectifier 71A connected between the a AC input terminal ViA and the positive and negative DC buses 731 and 732, a second AC/DC rectifier 71B connected between the B AC input terminal ViA and the positive and negative DC buses 731 and 732, a third AC/DC rectifier 71C connected between the C AC input terminal ViA and the positive and negative DC buses 731 and 732, a first DC/AC inverter 74A connected between the positive and negative DC buses 731 and 732 and the a AC output terminal VoA, a second DC/AC inverter 74B connected between the positive and negative DC buses 731 and 732 and the B AC output terminal VoB, a third DC/AC inverter 74C connected between the positive and negative DC buses 731 and 732 and the C AC output terminal VoC, and a DC/DC converter 72 connected between the rechargeable battery B7 and the positive and negative DC buses 731 and 732. Wherein each of the first, second and third AC/ DC rectifiers 71A, 71B and 71C is the same as the circuit configuration of the AC/DC rectifier 2 ' shown in fig. 2, each of the first, second and third DC/AC inverters 74A, 74B and 74C is the same as the circuit configuration of the DC/AC inverter 4 ' shown in fig. 7, and the DC/DC converter 72 is the same as the circuit configuration of the DC/DC converter 5 ' shown in fig. 9. The specific circuit structure and operation principle of the three-phase uninterruptible power supply 7 are not described in detail herein.
The three-phase uninterruptible power supply 7 has a large power rating and can employ one control device including a control unit for controlling the first, second and third AC/ DC rectifiers 71A, 71B and 71C, a control unit for controlling the DC/DC converter 72, and a control unit for controlling the first, second and third DC/AC inverters 74A, 74B and 74C without using a plurality of sets of control devices, thereby further reducing the cost.
Although the present invention has been described by way of preferred embodiments, the present invention is not limited to the embodiments described herein, and various changes and modifications may be made without departing from the scope of the present invention.

Claims (13)

1. An AC/DC rectifier, the AC/DC rectifier comprising:
the input end of each pulse width modulation rectification circuit is connected to the alternating current input end, and the output end of each pulse width modulation rectification circuit is connected to the positive direct current bus and the negative direct current bus;
a filter capacitor connected between the AC input terminal and a neutral point; and
a control unit for providing a plurality of pulse width modulation signals to a corresponding plurality of switching transistors in the same pulse width modulation rectification circuits;
wherein the plurality of pulse width modulated signals have a phase difference therebetween.
2. The AC/DC rectifier of claim 1 wherein said control unit is configured to provide a plurality of pulse width modulated carrier signals having phase differences to a corresponding plurality of switching transistors in said plurality of identical pulse width modulated rectifier circuits and compare said plurality of pulse width modulated carrier signals to an identical modulation signal to provide said plurality of pulse width modulated signals.
3. The AC/DC rectifier of claim 2 wherein the phase difference between any two of said plurality of pulse width modulated carrier signals is 360 ° divided by the number of said plurality of identical pulse width modulated rectifier circuits.
4. The AC/DC rectifier of any one of claims 1 to 3 wherein each said pulse width modulated rectifier circuit comprises:
a first capacitor and a second capacitor connected in series between the positive DC bus and the negative DC bus, the first capacitor and the second capacitor being connected to a neutral point;
the first switching transistor and the second switching transistor are sequentially connected between the positive direct current bus and the negative direct current bus, and the first switching transistor and the second switching transistor are connected to form a first node;
a third switching transistor and a fourth switching transistor connected between the first node and a neutral point; and
an inductor connected between the first node and the AC input terminal.
5. A DC/AC inverter, characterized in that the DC/AC inverter comprises:
the inverter comprises a plurality of identical inverter circuits connected in parallel, wherein the input end of each inverter circuit is connected to a positive direct current bus and a negative direct current bus, and the output end of each inverter circuit is connected to an alternating current output end;
a filter capacitor connected between the AC output terminal and a neutral point;
a control unit for providing a plurality of pulse width modulated signals to a corresponding plurality of switching transistors in the same plurality of inverter circuits;
wherein the plurality of pulse width modulated signals have a phase difference therebetween.
6. The DC/AC inverter of claim 5, wherein the control unit is configured to provide a plurality of pulse width modulated carrier signals having a phase difference to a corresponding plurality of switching transistors in the same inverter circuits and compare the plurality of pulse width modulated carrier signals with a same modulation signal to provide the plurality of pulse width modulated signals.
7. The DC/AC inverter of claim 6, wherein a phase difference between any two of the plurality of pulse width modulated carrier signals is 360 ° divided by the number of the plurality of identical inverter circuits.
8. The DC/AC inverter according to any one of claims 5 to 7, wherein each of the inverter circuits includes:
a first capacitor and a second capacitor connected in series between the positive DC bus and the negative DC bus, the first capacitor and the second capacitor being connected to a neutral point;
the first switching transistor and the second switching transistor are sequentially connected between the positive direct current bus and the negative direct current bus, and the first switching transistor and the second switching transistor are connected to form a first node;
a third switching transistor and a fourth switching transistor connected between the first node and a neutral point; and
an inductor connected between the first node and the AC output terminal.
9. A DC/DC converter, characterized in that the DC/DC converter comprises:
a plurality of identical DC/DC conversion circuits connected in parallel, the output ends of which are connected to the positive DC bus and the negative DC bus;
filter capacitors connected to input terminals of the plurality of identical DC/DC conversion circuits;
a control unit for supplying a plurality of pulse width modulation signals to a corresponding plurality of switching transistors in the same plurality of DC/DC conversion circuits;
wherein the plurality of pulse width modulated signals have a phase difference therebetween.
10. The DC/DC converter of claim 9, wherein the control unit is configured to provide a plurality of pulse width modulated carrier signals having a phase difference to a corresponding plurality of switching transistors in the same DC/DC conversion circuits, and compare the plurality of pulse width modulated carrier signals with a same modulation signal to provide the plurality of pulse width modulated signals.
11. The DC/DC converter of claim 10, wherein a phase difference between any two of the plurality of pulse width modulated carrier signals is 360 ° divided by the number of the plurality of identical DC/DC conversion circuits.
12. The DC/DC converter according to any one of claims 9 to 11, wherein each of the DC/DC conversion circuits includes:
a first capacitor and a second capacitor connected in series between the positive DC bus and the negative DC bus, the first capacitor and the second capacitor being connected to a neutral point;
the first switch transistor, the second switch transistor and the third switch transistor are sequentially connected between the positive direct current bus and the negative direct current bus, the second switch transistor is connected with the first switch transistor to form a first node, and the second switch transistor is connected with the third switch transistor to form a second node; and
the filter capacitor comprises a first inductor and a second inductor, wherein one end of the first inductor and one end of the second inductor are respectively connected to the first node and the second node, and the other end of the first inductor and the other end of the second inductor are connected to two ends of the filter capacitor.
13. An uninterruptible power supply, comprising:
an AC/DC rectifier as claimed in any one of claims 1 to 4, having its input connected to an alternating current input;
the DC/AC inverter of any of claims 5 to 8, having an input connected to an output of the AC/DC rectifier; and
a DC/DC converter as claimed in any of claims 9 to 12 connected between a rechargeable battery and the output of the AC/DC rectifier.
CN202010928745.XA 2020-09-07 2020-09-07 AC/DC rectifier, DC/AC inverter, DC/DC converter, and uninterruptible power supply Pending CN112039348A (en)

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TW110133028A TW202211599A (en) 2020-09-07 2021-09-06 AC/DC rectifier, DC/AC inverter, DC/DC converter and uninterruptible power supply

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CN110768551A (en) * 2019-11-21 2020-02-07 徐忠勇 AC-DC and DC-DC conversion multiplexing line and method
CN110995047A (en) * 2019-09-03 2020-04-10 山特电子（深圳）有限公司 Multi-input power converter, control method thereof and uninterruptible power supply comprising same

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Publication number Priority date Publication date Assignee Title
CN102624266A (en) * 2012-03-16 2012-08-01 华为技术有限公司 Three-level inverter circuit
WO2015108613A1 (en) * 2014-01-15 2015-07-23 Abb Technology Ag Interleaved multi-channel, multi-level, multi-quadrant dc-dc converters
CN104253559A (en) * 2014-10-13 2014-12-31 上海电气集团股份有限公司 Three-level energy storage current transformer
CN209982336U (en) * 2019-06-11 2020-01-21 阳光电源股份有限公司 Three-level Boost converter and photovoltaic system
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