CN109687743B - Power supply conversion circuit - Google Patents

Power supply conversion circuit Download PDF

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Publication number
CN109687743B
CN109687743B CN201811648935.5A CN201811648935A CN109687743B CN 109687743 B CN109687743 B CN 109687743B CN 201811648935 A CN201811648935 A CN 201811648935A CN 109687743 B CN109687743 B CN 109687743B
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switch tube
capacitor
voltage
power supply
inductor
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CN109687743A (en
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阚加荣
孙浩
董小燕
吴云亚
吴冬春
葛玉华
张守国
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Zhongtian Broadband Technology Co Ltd
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Yancheng Institute of Technology
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • 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
    • 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
    • H02M1/126—Arrangements for reducing harmonics from ac input or output using passive filters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
    • H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
    • H02M7/53871—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current
    • 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
    • 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
    • H02M1/0048—Circuits or arrangements for reducing losses
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

Abstract

The invention discloses a power supply conversion circuit, which comprises an input direct current source, a direct current conversion unit, an alternating current conversion unit and a filtering unit, wherein the direct current conversion unit is used for outputting a direct current bus voltage according to a direct current power supply, and the voltage of the direct current bus is higher than that of the direct current power supply; the alternating current conversion unit receives the direct current bus voltage and outputs an alternating current voltage and an alternating current; the filtering unit filters the AC current and the ripple of the AC voltage to provide a smooth AC voltage and AC current to the load. The power supply conversion circuit of the invention enables the voltage stress of the switch tube to be smaller, and the number of the switch tubes used in the power supply conversion circuit is less than that of the switch tube used in the traditional two-stage scheme, thereby reducing the conduction loss and the turn-off loss of the switch tube and improving the efficiency of the whole converter.

Description

Power supply conversion circuit
Technical Field
The invention relates to the technical field of electric energy conversion, in particular to a power supply conversion circuit.
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 problems of the prior art described above, an object of the present invention is to provide a high-efficiency and high-reliability power conversion circuit having a boosting capability and a control method of the power conversion circuit.
The technical scheme is as follows:
a power supply conversion circuit comprises a direct-current power supply, a first capacitor, a second capacitor, a coupling inductor, a first diode, a second diode, a third diode, a first switch tube, a second switch tube, a third switch tube, a fourth switch tube, a third inductor and a third capacitor, wherein the coupling inductor comprises a primary inductor and a secondary inductor, the same-name end of the primary inductor is connected with the positive electrode of the direct-current power supply, the different-name end of the primary inductor is connected with the positive electrode of the first diode and the same-name end of the secondary inductor, and the different-name end of the secondary inductor is connected with the first end of the second capacitor; the second end of the second capacitor is connected with the cathode of the first diode, the anode of the second diode and the anode of the third diode; the cathode of the second diode is connected with the output end of the first switching tube, the input end of the second switching tube and the first end of the third inductor, the second end of the third inductor is connected with the first end of the third capacitor, the cathode of the third diode is connected with the output end of the third switching tube, the input end of the fourth switching tube and the second end of the third capacitor, and the third capacitor is connected with a load in parallel; the input end of the first switch tube is connected with the input end of the third switch tube and is connected with the first end of the first capacitor, the second end of the first capacitor is grounded, the output end of the second switch tube and the output end of the fourth switch tube are connected with the cathode of the direct-current power supply, and the cathode of the direct-current power supply is grounded; the direct-current power supply, the first capacitor, the second capacitor, the coupling inductor, the first diode, the second diode, the third diode, the first switch tube, the second switch tube, the third switch tube and the fourth switch tube form a direct-current conversion unit, the first switch tube, the second switch tube, the third switch tube and the fourth switch tube form an alternating-current conversion unit, and the third inductor and the third capacitor form a filtering unit; the direct current conversion unit is used for outputting a direct current bus voltage according to a direct current power supply, wherein the direct current bus voltage is higher than the voltage of the direct current power supply, when at least one of the second switching tube and the fourth switching tube is conducted, the direct current power supply charges a primary side inductor, a secondary side inductor charges a second capacitor, and the second capacitor and the primary side inductor store energy; when the second switching tube and the fourth switching tube are both turned off, the coupling inductor is connected in series with the second capacitor to convert the respective stored electric energy to the first capacitor so as to boost the voltage of the first capacitor, namely the voltage of the direct current bus; the alternating current conversion unit receives the direct current bus voltage and outputs an alternating current voltage and an alternating current; the filtering unit filters the ripple of the alternating current and the alternating voltage to provide smooth alternating voltage and alternating current to a load.
Further, 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 proportional relation between the dc bus voltage and the voltage of the dc power supply is:
Figure BDA0001932581250000021
wherein, UinIs the voltage of a DC power supply, UdcIs a DC bus voltage, DdcIs the duty ratio of the DC conversion unit, N is the turn ratio of the secondary side to the primary side of the coupled inductor, and N is equal to N2/N1。
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:
Figure BDA0001932581250000022
wherein S isd1、Sd2、Sd3、Sd4Respectively the driving signals of the first switch tube, the second switch tube, the third switch tube and the fourth switch tube, SdcIs a first modulated signal, Sac1Is the second modulation signal, Sac2Is the third modulated signal.
Further, the first modulation signal is a fixed pulse signal generated by intercepting a modulation wave with a constant amplitude with a carrier wave; the second modulation signal is a pulse signal generated by intercepting a first sine half-wave modulation wave and a carrier; the third modulation signal is a pulse signal generated by intercepting a second sine half-wave modulation wave and a carrier, wherein the phase difference between the second sine half-wave modulation wave and the first sine half-wave modulation wave is 180 degrees.
Has the advantages that:
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 a power conversion circuit.
Fig. 2 is a schematic diagram of a modulation scheme of a power conversion circuit.
FIG. 3 is a schematic diagram of the generation of a driving signal of a switching tube of the power conversion circuit.
Fig. 4 is a schematic diagram of input and output voltages and dc bus side voltage of the power conversion circuit.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and examples.
The invention provides a power supply conversion circuit 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 at the direct current bus side.
The technical scheme of the invention is explained in detail in the following with the accompanying drawings:
as shown in fig. 1, the power conversion circuit 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 the switching tube without affecting the realization of the respective functions. The DC conversion unit 1 includes an input DC power supply VinA first capacitor C1A second capacitor C2A coupling inductor including a primary inductor L1Secondary side inductor L2And a first diode D1, a second diode D2, a third diode D3, a first switch tube S1, a second switch tube S2, a third switch tube S3, and a fourth switch tube S4. D1 is on, the DC power supply VinTo the primary side L of the coupling inductor1Charging, wherein primary side magnetization inductance stores energy; secondary side inductor L2For the second capacitor C2And (6) charging. When the first switch tube S1 and the third switch tube S3 are conducted simultaneously, the coupling inductor and the second capacitor C2In series to the first capacitor C1Energy is released. A second diode D2 and a third diode D3 for making the primary side magnetizing inductance L of the coupling inductance when the second switch tube S2 and the fourth switch tube S4 are conducted1And a second capacitor C2Storing energy; when the second switch tube S2 and the fourth switch tube S4 are turned off, the current is provided to the first capacitor C1And a charging path. Thus, the DC conversion unit converts the input voltage VinIs raised to a certain levelThe first capacitor C can be arranged on the side of the DC 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 ac conversion unit 2 includes a first arm and a second arm, and each arm is connected in parallel. The first bridge arm comprises a first switch tube S1 and a second switch tube S2, and the second bridge arm comprises a third switch tube S3 and a fourth switch tube S4. 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 the 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.
Wherein, the primary side L of the coupling inductor1End of same name and DC power supply VinIs connected to the positive pole of L1The unlike terminal of D and the anode and secondary side inductance L of D12The terminals with the same name are connected; l is2And a second capacitor C2Is connected with the first end of the first connecting pipe; second capacitor C2Is connected to the cathode of D1, a second capacitor C2And the second ends of the second diode D2 and the third diode D3 are also connected to anodes of the second diode D2 and the third diode D3, and cathodes of the second diode D2 and the third diode D3 are respectively connected to the midpoint of the first arm leg and the midpoint of the second arm leg. The output end of S1 is connected to the third inductor L3The first end of the second switch tube S2 is connected with the input end of the second switch tube S2; the output end of the third switch tube S3 and the third capacitor C3The second end is connected with the input end of the fourth switch tube S4. The input terminal of the first switch tube S1 is connected to the input terminal of the third switch tube S3, and is connected to the first capacitor C1Is connected to the positive pole of a first capacitor C1The negative electrode of (2) is grounded. The output end of the second switch tube S2 is connected with the output end of the fourth switch tube S4 and is connected with a direct current power supply VinNegative electrode connected to VinThe negative electrode is grounded; both ends of the load and C3The first end and the second end are respectively connected.
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 is used for converting direct current into alternating currentThe unit is replaced by a coupling inductor and an intermediate capacitor C2When the second switch tube S2 and the fourth switch tube S4 are turned on, the DC power supply VinTo the primary side L of the coupling inductor1Charging, primary side inductance L1Storing energy; secondary side inductor L2For the second capacitor C2And (6) charging. When the second switch tube S2 and the fourth switch tube S4 are turned off, the direct current power supply VinCoupled inductor, C2Form a series connection to a first capacitance C1Release energy so that it is on the dc bus side, i.e. the first capacitor C1The two ends can obtain higher voltage, and compared with the voltage gain of a bus of a traditional two-stage inverter, 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 example 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 dc conversion unit 1 and the ac conversion unit 2 multiplex the switching tubes S2 and S4. The dc conversion unit 1 duty control signal is kept constant as shown in fig. 2. Available at a fixed voltage urdcAnd carrier ucIntercept to generate a first modulated signal SdcAs control signal for the DC converter unit 1, fixed voltage urdcU is greater than or equal tocWhen S is presentdcAt a high level, a fixed voltage urdcLess than ucWhen S is presentdcIs low. For the alternating current conversion unit, two groups of sine half waves with the phase difference of 180 degrees can be modulated by intersecting with the carrier wave to generate two groups of modulation signals. As shown in fig. 2, 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 Sac2Respectively as AC conversion sheetsThe positive half cycle and the negative half cycle of the element (2) control signals. Wherein u israc1And urac2Is 180 degrees. 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. 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.
The duty ratio signal of the direct current conversion unit keeps 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.
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.
Figure BDA0001932581250000051
Wherein S1, S2, S3 and S4 are of switching tubes S1, S2, S3 and S4 respectivelyDrive signal, SdcIs a first modulated signal, Sac1Is the second modulation signal, 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 L is1、C2When the battery is charged,
Figure BDA0001932581250000061
when L is1、C2When the discharge is performed in series, the discharge voltage is reduced,
Figure BDA0001932581250000062
by utilizing the voltage-second balance of the inductor, the voltage gain of the direct current bus is as follows:
Figure BDA0001932581250000063
wherein u isL1、uL2Are primary side inductances L respectively1Secondary side inductor L2Voltage across, DdcIs the duty cycle of the dc conversion unit. N is the turn ratio of the secondary side to the primary side of the coupled inductor, and N is equal to N2/N1。
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:
Figure BDA0001932581250000064
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, the problem that the gain of the direct current bus side of the traditional direct current-alternating current circuit is low is solved, the requirement on duty ratio is low, the conduction time of the switch tube is shortened, and the conduction loss of the switch tube is reduced. 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 L1Charging, L2To C2Charging, wherein the primary side magnetizing 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 conversion 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. The switch tubes S1 and S2 are in complementary conduction, and S3 and S4 are in complementary conduction.
When S2, S4 are turned on, L1、C2The 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、C2Is in a discharge state. At this time L1、C2Series 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-cycles, L1、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 obtain a power frequency sinusoidal alternating current voltage at two ends of the 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. In fig. 4, the ordinate is the dc bus voltage, the output ac voltage, and the input dc voltage in this order from top to bottom.
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 (3)

1. A power conversion circuit, characterized by: comprising a DC power supply (V)in) A first capacitor (C)1) A second capacitor (C)2) The inductor comprises a coupling inductor, a first diode (D1), a second diode (D2), a third diode (D3), a first switching tube (S1), a second switching tube (S2), a third switching tube (S3), a fourth switching tube (S4) and a third inductor (L)3) And a third capacitance (C)3) The coupled inductor comprises a primary inductor (L)1) Secondary side inductor (L)2) The primary side inductance (L)1) And said dc power supply (V)in) Is connected to the positive pole of the primary side inductor (L)1) And the anode and secondary side inductances (L) of the first diode (D1)2) Is connected with the same name terminal of the secondary side inductor (L)2) And said second capacitor (C)2) The first end is connected; the second capacitance (C)2) Is connected to the cathode of the first diode (D1), the anode of the second diode (D2) and the third diode (D3); the cathode of the second diode is connected with the output end of the first switch tube (S1), the input end of the second switch tube (S2) and the third inductor (L)3) The third inductance (L)3) And said third capacitor (C)3) The cathode of the third diode is connected with the output end of the third switching tube (S3), the input end of the fourth switching tube (S4) and the third capacitor (C)3) The third capacitor is connected in parallel with a load; the input end of the first switch tube (S1) is connected with the input end of the third switch tube (S3) and is connected with the first capacitor (C)1) Is connected to a first terminal of a first capacitor (C)1) The second end of the second switch tube (S2), the output end of the fourth switch tube (S4) and the DC power supply (V)in) Negative pole connected to DC power supply (V)in) The negative electrode is grounded; what is needed isThe DC power supply (V)in) A first capacitor (C)1) A second capacitor (C)2) The direct current conversion device comprises a coupling inductor, a first diode (D1), a second diode (D2), a third diode (D3), a first switch tube (S1), a second switch tube (S2), a third switch tube (S3) and a fourth switch tube (S4) which form a direct current conversion unit, wherein the first switch tube (S1), the second switch tube (S2), the third switch tube (S3) and the fourth switch tube (S4) form an alternating current conversion unit, and the third inductor (L1), the second switch tube (S2), the third switch tube (S3) and the fourth switch tube (S4) form an alternating current conversion3) And a third capacitance (C)3) Forming a filtering unit; the DC conversion unit is used for outputting a DC bus voltage according to a DC power supply, wherein the DC bus voltage is higher than the DC power supply voltage, and when at least one of the second switching tube (S2) and the fourth switching tube (S4) is conducted, the DC power supply supplies a primary side inductor (L)1) Charging, secondary side inductance (L)2) To the second capacitance (C)2) Charging, the second capacitor (C)2) And primary side inductance (L)1) Storing energy; and when the second switch tube (S2) and the fourth switch tube (S4) are both turned off, the coupling inductor and the second capacitor (C)2) In series to convert the respective stored electrical energy to the first capacitor (C)1) To boost the first capacitance (C)1) I.e. boost the dc bus voltage; the alternating current conversion unit receives the direct current bus voltage and outputs an alternating current voltage and an alternating current; the filtering unit filters the ripples of the alternating current and the alternating voltage to provide smooth alternating voltage and alternating current for a load;
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:
Figure FDA0002961372070000021
wherein S isd1、Sd2、Sd3、Sd4Respectively the driving signals of the first switch tube, the second switch tube, the third switch tube and the fourth switch tube, SdcIs a first modulated signal, Sac1Is the second toneSystem signal, Sac2Is a third modulation signal;
the first modulation signal is a fixed pulse signal generated by intercepting a modulation wave with constant amplitude and a carrier wave; the second modulation signal is a pulse signal generated by intercepting a first sine half-wave modulation wave and a carrier; the third modulation signal is a pulse signal generated by intercepting a second sine half-wave modulation wave and a carrier, wherein the phase difference between the second sine half-wave modulation wave and the first sine half-wave modulation wave is 180 degrees.
2. A power conversion circuit according to claim 1, characterized in that: the first switch tube (S1) and the second switch tube (S2) are conducted complementarily, and the third switch tube (S3) and the fourth switch tube (S4) are conducted complementarily.
3. A power conversion circuit according to claim 1, characterized in that: the proportional relation between the DC bus voltage and the voltage of the DC power supply is as follows:
Figure FDA0002961372070000022
wherein, UinIs the voltage of a DC power supply, UdcIs a DC bus voltage, DdcIs the duty ratio of the DC conversion unit, N is the turn ratio of the secondary side to the primary side of the coupled inductor, and N is equal to N2/N1。
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CN104734547A (en) * 2015-03-19 2015-06-24 南京航空航天大学 Boost unit Z-source inverter
CN107659144A (en) * 2017-10-19 2018-02-02 金陵科技学院 Boosting unit converter built in inductance

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CN1859824A (en) * 2006-05-30 2006-11-08 浙江大学 Atmospheric pressure glow discharge control method and its circuit based on pulse density modulation
CN103887955A (en) * 2014-04-08 2014-06-25 盐城工学院 Grid-connected inverter for low-frequency current ripple output restraining of fuel cell and control device
CN104734547A (en) * 2015-03-19 2015-06-24 南京航空航天大学 Boost unit Z-source inverter
CN107659144A (en) * 2017-10-19 2018-02-02 金陵科技学院 Boosting unit converter built in inductance

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