CN109617397B - DC/AC power supply conversion device - Google Patents
DC/AC power supply conversion device Download PDFInfo
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- CN109617397B CN109617397B CN201811645521.7A CN201811645521A CN109617397B CN 109617397 B CN109617397 B CN 109617397B CN 201811645521 A CN201811645521 A CN 201811645521A CN 109617397 B CN109617397 B CN 109617397B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/08—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes without control electrode or semiconductor devices without control electrode
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- 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
- 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
Abstract
The invention discloses a direct current and alternating current power supply conversion device, which comprises a direct current conversion unit, an alternating current conversion unit and a filtering unit which are connected in sequence; the direct current conversion unit is used for outputting corresponding direct current bus voltage according to the direct current power supply, and the direct current bus voltage is higher than the voltage of the direct current power supply; the alternating current conversion unit is used for converting the direct current bus voltage into corresponding alternating current voltage and alternating current, and the filtering unit is used for filtering ripples of the alternating current and the alternating current voltage and providing smooth alternating current voltage and smooth alternating current for a load. According to the invention, the direct current conversion unit is used for obtaining higher direct current bus voltage and reducing the requirement on decoupling capacitance at the direct current bus side, compared with a two-stage structure, a transformer is not needed, the direct current unit and the alternating current unit are in the same stage, the number of switching tubes is small, the obtained direct current bus voltage is higher, the switching loss is reduced, the control is simple, the reliability is high, and the overall efficiency is high.
Description
Technical Field
The invention relates to the technical field of electric energy conversion, in particular to a direct current and alternating current power supply conversion device.
Background
With the increasing emphasis on energy conservation and environmental protection at present, new energy power generation is widely applied, but due to the influence of factors such as external environment, the output voltage range of a new energy power generation system such as solar energy/wind energy is wide, and meanwhile, the electromagnetic working environment is severe, a high-efficiency and high-reliability direct current and alternating current conversion device with high boosting capacity needs to be configured, so that the output voltage of the new energy is changed into alternating current voltage with the voltage frequency meeting the requirement. The traditional DC-AC conversion circuit has the problem of bridge arm direct connection, has low reliability in an electromagnetic interference environment, needs AC output voltage lower than DC input voltage, and cannot meet the working requirements.
The existing solution is to add an ac transformer or a dc converter to a dc-ac circuit to achieve the boost function, but the ac transformer is bulky and high in cost, and the two-stage structure added with the dc converter makes the system implementation complicated and affects the efficiency, and meanwhile, the reliability of the system is not improved; the existing single-pole converter such as an impedance source converter has the boosting capacity and high reliability, but the boosting work of the converter needs to utilize the direct-connection state of a bridge arm, the current stress and the conduction loss of a switching tube are large, the system efficiency is low, and the converter is only suitable for the application occasions of three-phase alternating current output.
Disclosure of Invention
The purpose of the invention is as follows: in order to overcome the defects of the prior art, the invention provides the direct-current and alternating-current power supply conversion device which has the advantages that compared with the traditional two-stage structure, the direct-current boosting capacity is higher, the requirement on inductance is low, the inductance copper loss, the inductance iron loss and the magnetic core loss are reduced, the number of the switching tubes is small, the direct-current state does not exist, the overall efficiency of the converter is improved, and the system reliability is high.
The technical scheme is as follows: in order to achieve the purpose, the invention adopts the technical scheme that:
a DC/AC power conversion device comprises a DC conversion unit, an AC conversion unit and a filtering unit which are connected in sequence;
the direct current conversion unit is used for outputting corresponding direct current bus voltage according to a direct current power supply, and the direct current bus voltage is higher than the voltage of the direct current power supply; the direct current conversion unit comprises a direct current power supply, a first capacitor, a second capacitor, a first inductor, a second switch tube and a fourth switch tube, and when at least one of the second switch tube and the fourth switch tube is conducted, the first inductor, the second inductor and the second capacitor store electric energy; when the second switching tube and the fourth switching tube are both turned off, the first inductor, the second inductor and the second capacitor convert the stored electric energy into the first capacitor so as to improve the voltage of the first capacitor, namely the voltage of the direct-current bus;
the alternating current conversion unit is used for receiving the direct current bus voltage output by the direct current conversion unit and converting the direct current bus voltage into corresponding alternating current voltage and alternating current; the filtering unit is used for filtering ripples of the alternating current and the alternating voltage and providing smooth alternating voltage and alternating current to a load.
Furthermore, the dc conversion unit further includes a first diode, a second diode, a third diode, a first switch tube, and a third switch tube;
the first end of the first inductor is connected with the positive electrode of the direct-current power supply, and the second end of the first inductor is connected with the second end of the second inductor through a second diode; the first end of the second inductor is connected with the positive electrode of the direct-current power supply through the first diode, and the second end of the second inductor is connected with the anode of the third diode and the anode of the fourth diode; and the first end of the second capacitor is connected with the cathode of the first diode, and the second end of the second capacitor is connected with the second end of the first inductor.
Further, the alternating current conversion unit comprises a first bridge arm and a second bridge arm which are connected in parallel, wherein the first bridge arm is formed by connecting a first switching tube and a second switching tube in series, and the second bridge arm is formed by connecting a third switching tube and a fourth switching tube in series; the middle point of the first bridge arm is a connection point of the first switching tube and the second switching tube, the middle point of the second bridge arm is a connection point of the third switching tube and the fourth switching tube, and the cathodes of the third diode and the fourth diode are respectively connected to the middle point of the first bridge arm and the middle point of the second bridge arm.
Furthermore, the first switch tube and the second switch tube are conducted complementarily, and the third switch tube and the fourth switch tube are conducted complementarily.
Further, the filtering unit includes a third inductor, a third capacitor, and a load; the first end of the third inductor is connected to the midpoint of the first bridge arm, the second end of the third inductor is connected to the midpoint of the second bridge arm through a third capacitor, and the load is connected in parallel with the third capacitor.
Further, a voltage ratio relationship between the dc bus voltage and the dc power supply is:
wherein, VinIs the voltage of a DC power supply, VdcIs a DC bus voltage, DdcIs the duty cycle of the dc conversion unit.
Further, the logic relationship of the driving signals of the first switching tube, the second switching tube, the third switching tube and the fourth switching tube is as follows:
wherein S1, S2, S3 and S4 are driving signals of the first switch tube, the second switch tube, the third switch tube and the fourth switch tube, respectively, SdcIs a first modulated signal, Sac1Is a second modulated signal, Sac2Is the third modulated signal.
Further, the first modulation signal SdcA fixed pulse signal generated by the intersection of a modulation wave with constant amplitude and a carrier wave, a second modulation signal Sac1A pulse signal generated by the intersection of the first half-sine wave modulated wave and the carrier wave, and a third modulation signal Sac2Generating a pulse signal for intercepting a second sine half-wave modulation wave and the carrier wave; wherein the phase difference between the second sinusoidal half-wave modulated wave and the first sinusoidal half-wave modulated wave is 180 degrees.
In the invention, the duty ratio signal of the direct current conversion unit is kept constant, and a modulation wave with constant amplitude can be intersected with a carrier wave to obtain a fixed pulse signal; the duty ratio signal of the alternating current conversion unit needs to change along with the sine signal, a sine half-wave modulation wave needs to be intercepted with the carrier, and then the fixed pulse signal and the sine pulse signal generate driving signals of each switching tube through a logic circuit.
Has the advantages that: compared with the prior art, the direct current and alternating current power supply conversion device provided by the invention has the following advantages:
1) compared with the traditional two-stage structure, the device has higher direct current boosting capacity and small requirement on inductance value, and reduces the copper loss, iron loss and magnetic core loss of the inductor;
2) the direct current bus voltage is high, and the requirement on a direct current bus decoupling capacitor is lower;
3) the number of the used switching tubes is small, the stress of the switching tubes is small, and the overall efficiency of the converter is improved;
4) the switch tube has no direct connection state, and the system reliability is high.
Drawings
FIG. 1 is a circuit diagram of an embodiment of the present invention;
FIGS. 2a-2c are schematic diagrams illustrating modulation schemes of three modulated signals according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a logic circuit of driving signals of each switching tube according to an embodiment of the present invention;
FIG. 4 is a diagram illustrating the input and output voltages and the DC bus voltage according to an embodiment of the present invention.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and examples.
The invention provides a direct current and alternating current power supply conversion device which comprises a direct current conversion unit, an alternating current conversion unit and a filtering unit, wherein the direct current conversion unit is used for obtaining higher direct current bus voltage and reducing the requirement on decoupling capacitance of the direct current bus side.
As shown in fig. 1, the dc/ac power conversion apparatus includes a dc conversion unit 1, an ac conversion unit 2, and a filter unit 3. Since both the two ends of the first capacitor need to obtain higher voltage and the use of the switching tube needs to be reduced as much as possible to improve the system efficiency, the dc conversion unit 1 and the ac conversion unit 2 share part of the switching tube without affecting the realization of the respective functions.
Wherein the DC conversion unit 1 comprises an input DC power supply VinA first capacitor C1A second capacitor C2A first inductor L1A second inductor L2A first diode D1, a second diode D2. When D1 and D2 are turned on, L1、L2In parallel, the DC power supply VinFor the first inductance L1A second inductor L2A second capacitor C2Charging, L1、L2、C2Storing energy simultaneously. When the second switch tube and the fourth switch tube are both turned off, L1、L2、C2In series to the first capacitor C1Energy is released. Diodes D3 and D4 for turning on the second switch tube S2 and the fourth switch tube S41、L2Storing energy; when S2 and S4 are turned off, the first capacitor C is provided1And a charging path. Thus, the DC conversion unit converts the input voltage VinRising to a certain level, namely the first capacitor C on the side of the direct current bus1The two ends of the AC conversion unit obtain higher voltage, so that the voltage is used as an input source of the AC conversion unit and is matched with the output voltage of the AC side.
The alternating current conversion unit 2 includes a first arm and a second arm connected in parallel, wherein the first arm is formed by connecting a first switching tube S1 and a second switching tube S2 in series, and the second arm is formed by connecting a third switching tube S3 and a fourth switching tube S4 in series. The alternating current conversion unit is used for converting direct current electric energy on the direct current bus side into alternating current electric energy to be output.
The filter unit filters the output voltage and current of the AC conversion unit, and a third inductor L3The filter inductor is used for smoothing the output load current and has a wave smoothing function. Third capacitor C3To output the filter capacitor, the output voltage is smoothed, so that the output voltage waveform at two ends of the load is close to a sine wave.
The specific circuit structure comprises1First end of (1) and (V)inIs connected to the positive pole of L2Through diodes D1 and VinThe positive electrode of (1) is connected; l is2First terminal and C2First end connection, L1Second terminal and C2Are connected with each other; l is1The second end is connected with the first end through D2 and L2Are connected with each other; l is2And the second end of the diode is respectively connected with the middle point of the first bridge arm and the middle point of the second bridge arm through diodes D3 and D4. Output terminal of S1 and L3Is connected to the input terminal of S2, and the output terminal of S3 is connected to C3Second terminal, S4 input terminal, L3Second terminal and C3The first end is connected; input terminal S1, input terminal S3, and input terminal C1Are connected to a first end of C1The second terminal of (1) is grounded; output terminal of S2And output terminal of S4, VinNegative electrode connected to VinThe negative electrode is grounded; load and C3And (4) connecting in parallel.
Compared with the traditional two-stage structure that only a single inductor is adopted at the direct current end for boosting, the direct current and alternating current conversion device of the embodiment adopts two inductors L in the direct current conversion unit1、L2And a capacitor C2. When the second switch tube S2 and the fourth switch tube S4 are turned on, the DC power supply V is inputtedinCan simultaneously pair L1、L2、C2Charging, make L1、L2、C2Storing energy; when the second switch tube S2 and the fourth switch tube S4 are turned off, L1、L2、C2Forming a series connection and collectively discharging energy to the first capacitor C1. So that on the dc bus side, i.e. the first capacitor C1The two ends can obtain higher voltage than the traditional two-stage structure, and the voltage gain is obviously improved. In addition, the direct current and alternating current device only uses four switching tubes, and the number of the switching tubes is less than that of the switching tubes used in the traditional two-stage structure, so that the conduction loss and the turn-off loss of the switching tubes in the system are effectively reduced, and the control is simple; compared with the traditional two-stage structure, the direct current-alternating current power conversion device can realize direct current-alternating current power conversion at the same stage, so that the output efficiency of the system is effectively improved.
In use, the dc conversion unit 1 and the ac conversion unit 2 in this embodiment can work synchronously, and in one embodiment, the modulation mode is to control two signals, i.e. the modulation signal of the dc conversion unit 1 and the modulation signal of the ac conversion unit 2. The switching tubes S1, S2, S3 and S4 are multiplexed by the dc conversion unit 1 and the ac conversion unit 2, and the duty ratio control signal of the dc conversion unit 1 is kept constant.
As shown in FIG. 2a, a fixed voltage u may be usedrdcAnd carrier ucIntercept to generate a first modulated signal SdcAs a control signal for the DC-to-DC converter unit 1 at a constant voltage urdcU is greater than or equal tocWhen S is presentdcAt a high level, at a constant voltage urdcLess than ucWhen S is presentdcIs low. For ac conversion units, two sets of phase differences 18 are usedThe sine half wave of 0 degree is modulated with the carrier intersection to generate two groups of modulation signals. As shown in fig. 2b, 2c, two sets of half-waves u are usedrac1And urac2Are respectively associated with the carrier ucIntercept to generate a second modulated signal Sac1And a third modulation signal Sac2As positive and negative half cycle control signals of the ac converting unit 2, respectively. Wherein u israc1And urac2Is 180 degrees. In a half-wave sine urac1Greater than or equal to carrier ucTime of day, second modulation signal Sac1Is at a high level; otherwise, the second modulation signal Sac1Is low. In a half-wave sine urac2Greater than or equal to carrier ucTime of day, third modulation signal Sac2Is at a high level; otherwise, the third modulation signal Sac2Is low.
According to a first modulation signal SdcA second modulation signal Sac1And a third modulation signal Sac2The driving signal of the switching tube is obtained through the output of the logic circuit, and the logic relation is shown as the formula (1). Therefore, the four switching tubes are in a high-frequency working state, harmonic components are reduced, and the output voltage waveforms at two ends of the load are closer to a sine wave. FIG. 3 is a schematic diagram of a logic circuit for generating a driving signal of a switching tube, a second modulation signal Sac1After passing through the NOT gate, the first modulation signal SdcThrough AND operation, a driving signal of a switch tube S2 is generated; the driving signal of the switch tube S2 passes through the not gate to generate the driving signal of the switch tube S1. Third modulated signal Sac2After passing through the NOT gate, the first modulation signal SdcThrough AND operation, a driving signal of a switch tube S4 is generated; the driving signal of the switch tube S4 passes through the not gate to generate the driving signal of the switch tube S3. Each driving signal drives the corresponding switch tube to realize power conversion.
Wherein S1, S2, S3 and S4 are driving signals of the switching tubes S1, S2, S3 and S4 respectively, and SdcIs a first modulated signal, Sac1Is as followsTwo modulated signals, Sac2Is the third modulated signal.
According to the driving signal and the working characteristic of the switch tube of the embodiment, the following are provided:
when V isinTo L1、L2When the battery is charged,
when L is1、L2、C2When the discharge is performed in series, the discharge voltage is reduced,
by utilizing the voltage-second balance of the inductor, the voltage gain of the direct current bus is as follows:
wherein the content of the first and second substances,
are respectively an inductance L1、L2Voltage across, DdcIs the duty cycle of the dc conversion unit.
In a traditional direct current-alternating current conversion circuit, only a single inductor is adopted at an input end for boosting, and the voltage gain of a direct current bus side is as follows:
therefore, compared with the traditional direct current-alternating current circuit, the direct current-alternating current conversion device has the advantages that the voltage on the direct current bus side is obviously improved, and the problem of low voltage gain on the direct current bus side of the traditional direct current-alternating current circuit is solved. Traditional conversion equipment is for example two-stage type structure, and it is more than four to adopt the switch tube quantity, and this example only adopts four switch tubes to realize the electric energy conversion, and switching loss is little, has also reduced the system loss. The whole efficiency of the two-stage structure is the product of the efficiency of the direct current conversion unit and the efficiency of the alternating current conversion unit, the electric energy conversion is realized in a single stage, and the efficiency is higher than that of the two-stage structure.
In steady state, V is turned on at the positive half cycle when S1 and S4 are turned oninTo L1、L2Charging simultaneously, at this time L1、L2The average value of the voltage of the second capacitor is maintained at the input voltage, and the inductor in the direct current conversion unit is in an energy storage state; a first capacitor C1When discharging, the ac conversion unit is in the ac output state, and the dc and ac units are controlled to operate simultaneously, and when the dc conversion unit operates, S4 is turned on, and when the ac conversion unit operates, S4 is also turned on, so the switching tube S4 is a common switching tube for the dc and ac conversion units. S1 is in complementary conduction with the switch tube S2, and S3 is in complementary conduction with the switch tube S4.
When S2, S4 are turned on, L1、L2The direct current conversion unit is still in a charging state, the direct current conversion unit is in a boosting state, and the alternating current conversion unit is in an inductive current follow current state; at this time, S2 and S4 are common switching tubes.
When S1, S3 are turned on, L1、L2Is in a discharge state. At this time L1、L2Series connection pair C1And charging, wherein the alternating current conversion unit is in an inductive current follow current state. The negative half cycle operating conditions are similar.
In the positive or negative half cycle, the inductance L1、L2、C2Only when S1 and S3 are turned on, the discharge state is maintained, and the rest are charged. The output of the alternating current conversion unit can be used for obtaining power frequency sinusoidal alternating current voltage at two ends of a load through the filtering unit.
According to the operating characteristics of this example, D is requireddc≥Dac(max)Wherein D isac(max)For the maximum duty ratio of the ac conversion unit, the output voltage can obtain the desired sinusoidal ac voltage according to the control logic of fig. 2 and 3, and fig. 3 shows the logic modulation diagram of the present circuit. FIG. 4 shows the DC bus voltage V in this embodimentdcAnd an output AC voltage VoInput DC voltage Vin。
The above description is only of the preferred embodiments of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the invention and these are intended to be within the scope of the invention.
Claims (4)
1. A DC/AC power supply conversion device is characterized by comprising a DC conversion unit, an AC conversion unit and a filtering unit which are connected in sequence;
the direct current conversion unit is used for outputting corresponding direct current bus voltage according to a direct current power supply, and the direct current bus voltage is higher than the voltage of the direct current power supply; the direct current conversion unit comprises a direct current power supply, a first capacitor, a second capacitor, a first inductor, a second switch tube and a fourth switch tube, and when at least one of the second switch tube and the fourth switch tube is conducted, the first inductor, the second inductor and the second capacitor store electric energy; when the second switching tube and the fourth switching tube are both turned off, the first inductor, the second inductor and the second capacitor convert the stored electric energy into the first capacitor so as to improve the voltage of the first capacitor, namely the voltage of the direct-current bus;
the alternating current conversion unit is used for receiving the direct current bus voltage output by the direct current conversion unit and converting the direct current bus voltage into corresponding alternating current voltage and alternating current; the filtering unit is used for filtering ripples of alternating current and alternating voltage and providing smooth alternating voltage and alternating current to a load;
the direct current conversion unit also comprises a first diode, a second diode, a third diode, a fourth diode, a first switching tube and a third switching tube;
the first end of the first inductor is connected with the positive pole of the direct-current power supply, the second end of the first inductor is connected to the anode of the second diode, and the cathode of the second diode is connected to the second end of the second inductor; the first end of the second inductor is connected to the cathode of a first diode, the anode of the first diode is connected to the anode of the direct-current power supply, and the second end of the second inductor is connected with the anode of a third diode and the anode of a fourth diode; the first end of the second capacitor is connected with the cathode of the first diode, and the second end of the second capacitor is connected with the second end of the first inductor;
the alternating current conversion unit comprises a first bridge arm and a second bridge arm which are connected in parallel, wherein the first bridge arm is formed by connecting a first switching tube and a second switching tube in series, and the second bridge arm is formed by connecting a third switching tube and a fourth switching tube in series; the middle point of the first bridge arm is a connection point of a first switching tube and a second switching tube, the middle point of the second bridge arm is a connection point of a third switching tube and a fourth switching tube, and cathodes of a third diode and a fourth diode are respectively connected to the middle point of the first bridge arm and the middle point of the second bridge arm;
the logic relation of the driving signals of the first switching tube, the second switching tube, the third switching tube and the fourth switching tube is as follows:
wherein S1, S2, S3 and S4 are driving signals of the first switch tube, the second switch tube, the third switch tube and the fourth switch tube, respectively, S dc Is a first modulated signal, S ac1Is a second modulated signal, S ac2Is a third modulation signal;
the first modulation signal S dc A fixed pulse signal generated by the intersection of a modulation wave with constant amplitude and a carrier wave, a second modulation signal S ac1A pulse signal generated by the intersection of the first half-sine wave modulated wave and the carrier wave, and a third modulation signal S ac2Generating a pulse signal for intercepting a second sine half-wave modulation wave and the carrier wave; wherein the phase difference between the second sinusoidal half-wave modulated wave and the first sinusoidal half-wave modulated wave is 180 degrees.
2. The device according to claim 1, wherein the first switching tube and the second switching tube are conducted complementarily, and the third switching tube and the fourth switching tube are conducted complementarily.
3. The apparatus according to claim 2, wherein the filter unit comprises a third inductor, a third capacitor, and a load; the first end of the third inductor is connected to the midpoint of the first bridge arm, the second end of the third inductor is connected to the midpoint of the second bridge arm through a third capacitor, and the load is connected in parallel with the third capacitor.
4. The apparatus according to claim 1, wherein the voltage ratio relationship between the dc bus voltage and the dc power supply is:
wherein the content of the first and second substances,V inis the voltage of the direct current power supply,V dcis a voltage of the direct-current bus,D dc is the duty cycle of the dc conversion unit.
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