CN113726199A - Low-output ripple boost rectifier and control method thereof - Google Patents
Low-output ripple boost rectifier and control method thereof Download PDFInfo
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- CN113726199A CN113726199A CN202111029713.7A CN202111029713A CN113726199A CN 113726199 A CN113726199 A CN 113726199A CN 202111029713 A CN202111029713 A CN 202111029713A CN 113726199 A CN113726199 A CN 113726199A
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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
- H02M7/02—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
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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
- H02M1/14—Arrangements for reducing ripples from dc input or output
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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
- H02M1/32—Means for protecting converters other than automatic disconnection
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Abstract
The invention discloses a low-output ripple boost rectifier and a control method thereof, and belongs to the technical field of power electronic converters. Wherein L is1One end is connected with UinPositive terminal, the other end S1Connecting; l is2One end is connected with UinOne end, L2The other end and S2The connection of (1); l is3One end is connected with D2Cathode, the other end and S4Connecting; d1The anodes are respectively connected with S2And S3And a capacitor C2And C3One end of (a); d1The cathodes are respectively connected with L1One end and S1；D2The anodes are respectively connected with S2And L2One end; d2The cathodes are respectively connected with S1And L3One end and C1One end of the tube. The invention relates to a rectifier, belonging to a rectifier setThe ready rectifier utilizes the multiplexing technology of a power device, obviously reduces the number of elements of the rectifier, reduces the system cost, improves the integration level and has small circuit occupation space; the body diode of the power switch tube is not involved in the working process, the switching loss is small, the efficiency is high, the cost is low, and the service life is long.
Description
Technical Field
The invention relates to the technical field of power electronic converters, in particular to a low-output ripple boost rectifier and a control method thereof.
Background
With the development of modern science and technology, new energy industry is developing vigorously, and new energy needs to be converted into electric energy to be used by equipment, if a fault occurs in the process of converting primary energy into electric energy, not only can resources be wasted, but also an electric power system and electric equipment are damaged, and therefore, the reliability of electric energy quality must be ensured. The PWM rectification technology plays an important role in electric energy conversion, so that the development of a rectifier with high efficiency, high reliability and high power density has great practical significance.
The traditional PWM rectification circuit is mainly based on bridge topology, and because two power switching tubes on one bridge arm are directly connected in series, the hidden danger of bridge arm direct connection exists, and the reliability of the system is influenced. In addition, when the power switch tube is turned off, the traditional bridge rectifier circuit continues current through the body diode of the switch tube, the problem of reverse recovery of the body diode of the power switch tends to be serious along with the improvement of the switching frequency, the proportion of the reverse recovery loss in the total loss of the converter is greatly increased, and a high-efficiency and high-reliability rectifier circuit is needed in occasions with higher requirements on the reliability of a power supply.
In recent years, a great number of studies have been made on rectifying harmonic devices by scholars at home and abroad aiming at solving the problem of how to solve the second harmonic of the direct current bus of the rectifier. In The document of The Research of Single-phase PWM Rectifier base on Direct Current Control Technology, an LC resonant circuit is connected in parallel at a dc bus end of a Rectifier to filter out a higher harmonic part in a dc bus voltage, however, in a Single-phase system, in order to eliminate a second harmonic, a filter inductance and a capacitance value used are still large, and particularly, a volume becomes large after an inductance is added. Meanwhile, the parameters of the inductor and the capacitor need to be accurately calculated, and once the frequency of the power grid deviates, the compensation effect of the system is poor.
Disclosure of Invention
1. Technical problem to be solved by the invention
The converter can overcome the defects of bridge arm direct potential and switch tube diode participation in working of the traditional bridge rectifier circuit, and can inhibit second harmonic in direct-current side voltage.
2. Technical scheme
In order to achieve the purpose, the technical scheme provided by the invention is as follows:
the invention discloses a low-output ripple boost rectifier, which comprises a main circuit and a filter circuit, wherein the main circuit comprises a power switch tube S1、S2Inductance L1、L2Capacitor C1、C2Diode D1And D2(ii) a AC power supply UinReference positive terminal and inductor L1And L2Is connected to an inductor L1The other end and a diode D1Cathode connected to inductor L2Another terminal of (1) and a diode D2Anode connected, diode D1The anodes are respectively connected with a power switch tube S2Terminal 2, capacitor C2Is connected to node B; diode D2The cathode is connected to the power switch tube S1Terminal 1 and capacitor C1Is connected to node a; capacitor C1And C2The other end of the switch is connected with an alternating current power supply UinA reference negative terminal of; wherein, the power switch tube S1And S2Are connected in anti-parallel with the diode at two ends; nodes a and B form an output; the filter circuit is connected between the nodes A and B.
Furthermore, the filter circuit is an active filter circuit and comprises an inductor L3Capacitor C3Power switch tube S3And S4Inductance L3One end is connected with the node A, and the other end is connected with the power switch tube S 42 terminal and power switch tube S 31 terminal of, capacitor C3One end is connected with the node B, and the other end is connected with the power switch tube S4End 1 of the power switch tube S3Is connected to node B.
Further, the diode D1And D2Is a fast recovery diode.
Furthermore, a load R is connected between the nodes a and B.
The invention discloses a control method of a low-output ripple boost rectifier, which is characterized by comprising the following steps: the working principle of the rectifier in the positive and negative half waves of the sine modulation wave is the same;
in the positive half period of the input power supply, when the modulation wave is greater than the carrier wave, the power switch tube S is controlled2Conduction, S1Disconnected, AC power UinAnd a capacitor C2Through a switching tube S2For inductor L2Charging, flowing through the inductor L2Current of (I)L2Increase, capacitance C1Discharging to supply power to the load R;
when the modulated wave is less than the carrier wave, the power switch tube S is controlled1Off, S2Off, diode D2On, the capacitance C2Discharging and supplying power to the load R.
In the negative half period of the input power supply, when the modulation wave is greater than the carrier wave, the power switch tube S is controlled1Conduction, S2Disconnected, AC power UinAnd a capacitor C1Through a switching tube S1For inductor L1Charging, flowing through the inductor L1Current of (I)L1Increase, capacitance C2Discharging to supply power to the load R;
when the modulated wave is less than the carrier wave, the power switch tube S is controlled2Breaking, S1Off, diode D1On, the capacitance C1Discharging and supplying power to the load.
Furthermore, the filter circuit control and the main circuit control are independent; at the inductor L3Current of (I)L3When the modulation wave is larger than 0 and the carrier wave is larger, the power switch tube S4Off, S3Conducting; power switch tube S3Inductance L3A closed loop is formed by the inductor L and the load R3Discharge, current IL3Through a power switch tube S3Injecting the body diode follow current into a direct current bus;
when the modulated wave is smaller than the carrier wave, the power switch tube S4Conduction, S3Turning off; capacitor C3Power switch tube S4Inductor L3A closed loop formed by the capacitor C and the load R3Discharge, inductance L3Charging, current IL3Through a power switch tube S4Injecting a direct current bus;
the direct current bus is a node A-a capacitor C1-a capacitance C2-a node B leg.
At the inductor L3Current of (I)L3When the modulation wave is less than 0 and greater than the carrier wave, the power switch tube S3Conduction, S4Closed, power switch tube S3And the direct current bus forms a closed loop, and current passes through an inductor L from the end A of the direct current bus3And a power switch tube S3Flows to the B end of the direct current bus, and the energy on the bus passes through S3Injection inductor L3Inductance L3Storing energy;
when the modulated wave is smaller than the carrier wave, the power switch tube S3Closure, S4Conducting; inductor L3Capacitor C3Power switch tube S4And a DC bus to form a closed loop, current IL3Passing through inductor L at end A of direct current bus3Power switch tube S4Body diode and capacitor C3Flowing to the B end of the DC bus and an inductor L3Discharge energy, capacitance C3Energy is stored.
3. Advantageous effects
Compared with the prior art, the technical scheme provided by the invention has the following remarkable effects:
(1) the low-output ripple boost rectifier belongs to an integrated rectifier, utilizes the multiplexing technology of a power device, obviously reduces the number of elements of the rectifier, reduces the system cost, improves the integration level, and has small circuit occupation space; the body diode of the power switch tube is not involved in the working process, the switching loss is small, the efficiency is high, the cost is low, and the service life is long.
(2) The low-output ripple boost rectifier has high boost capacity, and 2 power switching tubes S are controlled1And S2Is turned onThe power supply is switched off, so that the boosting and rectifying functions can be realized, the voltage of an output direct current bus is more than twice of the peak voltage of an input power supply, and the power supply is suitable for high-voltage and high-power occasions; the rectifier adopts voltage and current double closed-loop control, and has the advantages of high precision and quick dynamic response.
(3) According to the control method of the low-output ripple wave boost rectifier, the two boost bridge arm units work in turn according to the positive and negative conditions of input current, only one power switching tube works at high frequency in each half power frequency period, and the loss of the switching tube is reduced; harmonic components in power transmitted from the alternating current side to the direct current side are transmitted to an inductance capacitor of a filter circuit, so that voltage fluctuation of the direct current side capacitor is reduced, and meanwhile, the actual current of a current loop does not contain harmonic components; the invention adopts active filtering, greatly reduces the capacitance of the direct current bus side capacitor, the sizes of the filter circuit inductor and the filter circuit capacitor, and reduces the system loss.
Drawings
FIG. 1 is an overall circuit diagram of the present invention;
FIG. 2 is a schematic circuit diagram of the main circuit of the present invention;
FIG. 3 is a schematic circuit diagram of a filter circuit according to the present invention;
FIG. 4 is a schematic diagram of a main circuit operation mode according to the present invention;
FIG. 5 is a diagram illustrating a second operating mode of a main circuit according to the present invention;
FIG. 6 is a schematic diagram of a main circuit operation mode of the present invention;
FIG. 7 is a diagram illustrating four main circuit modes of operation according to the present invention;
FIG. 8 is a schematic diagram of the filter circuit according to an embodiment of the present invention;
FIG. 9 is a diagram illustrating a second mode of operation of the filter circuit according to the present invention;
FIG. 10 is a schematic diagram of a filter circuit according to a third embodiment of the present invention;
FIG. 11 is a diagram illustrating four modes of operation of the filter circuit according to the present invention;
FIG. 12 is a block diagram of the control circuit of the main circuit of the present invention;
FIG. 13 is a block diagram of the control circuit of the filter circuit of the present invention;
FIG. 14 is a schematic diagram of the input voltage, input current, inductor current and driving waveforms of the main circuit of the present invention;
FIG. 15 is a schematic diagram of the output voltage waveform of the main circuit of the present invention;
FIG. 16 is a schematic diagram of a harmonic current waveform of the filter circuit of the present invention;
fig. 17 is a schematic diagram of an output voltage waveform of the filter circuit of the present invention.
Detailed Description
For a further understanding of the invention, reference should be made to the following detailed description taken in conjunction with the accompanying drawings and examples.
Example 1
With reference to fig. 1 and fig. 2, the main circuit of the low-output ripple boost rectifier of the present embodiment includes a power switch tube S1、S2Inductance L1、L2Capacitor C1、C2Diode D1And D2(ii) a AC power supply UinReference positive terminal and inductor L1And L2Is connected to an inductor L1Another terminal of (1) and a diode D1Cathode connected to inductor L2Another terminal of (1) and a diode D2Anode connected, diode D1The anodes are respectively connected with a power switch tube S2Terminal 2, capacitor C2Is connected to node B; diode D2The cathode is connected to the power switch tube S1Terminal 1 and capacitor C1Is connected to node a; capacitor C1And C2The other end of the switch is connected with an alternating current power supply UinA reference negative terminal of; wherein, the power switch tube S1、S2Are connected in anti-parallel with the diode. Nodes a and B form the output.
FIG. 12 is a block diagram of a control circuit adopted by the main circuit of this embodiment, which adopts voltage-current dual closed-loop control, i.e., reference voltage UrefAnd an output voltage U0Comparing sampled values, obtaining an error voltage signal U by an error amplifiereError voltage signal UeAnd an input voltage UinMultiplying the sampling values to obtain a reference I of the current looprefWill input a current IinFeedback signal and reference current IrefComparing, comparing with high-frequency triangular wave after being regulated by PI regulator to generate high-frequency pulse signal, and finally outputting power switch tube S through logic circuit1，S2The drive signal of (1).
Fig. 14 and 15 are simulation waveforms of the main circuit of the present embodiment, and simulation parameters are as follows: the input voltage is 220V/50HZ, the output voltage is 800V, the output power is 2KW, and the output voltage is formed by an input voltage waveform UinAnd an input current IinIt can be seen that the input current can well track the input voltage, the rectifier works under the unit power factor, but the output voltage has large ripple, and the ripple needs to be suppressed by adopting a filter circuit. From two inductor currents IL1And IL2And a power switch tube S1And S2The driving waveforms of (A) and (B) can be seen that two power switch tubes S1，S2Alternately operating in positive and negative half cycles of the input voltage. The working modes comprise a mode one, a mode two, a mode three and a mode four, and the detailed conditions are as follows:
mode one
As shown in fig. 4, during the positive half period of the input power, when the modulated wave is larger than the carrier wave, the power switch tube S1Turn-off, diode D1，D2Off, S2And conducting. Input voltage UinInductor L2Power switch tube S2And a capacitor C2A closed loop is formed. AC power supply UinAnd a capacitor C2Through a switching tube S2For inductor L2Charging, flowing through the inductor L2Current of (I)L2Increase, capacitance C1Discharging and supplying power to the load R.
Mode two
As shown in fig. 5, during the positive half period of the input power, when the modulated wave is smaller than the carrier wave, the power switch tube S1Off, S2Turn-off, diode D1Turn-off, diode D2Turning on and inputting power UinInductor L2Diode D2And a capacitor C1Forming a closed loop through the inductor L2Current of (I)L2And decreases.Capacitor C2Discharging and supplying power to the load R.
Modal three
As shown in fig. 6, during the negative half period of the input power, when the modulated wave is larger than the carrier wave, the power switch tube S2Turn-off, diode D1，D2Off, S1On, input voltage UinInductor L1Power switch tube S1And a capacitor C1A closed loop is formed. AC power supply UinAnd a capacitor C1Through a switching tube S1For inductor L1Charging, flowing through the inductor L1Current of (I)L1Increase, capacitance C2Discharging and supplying power to the load.
Mode four
As shown in fig. 7, during the negative half period of the input power, when the modulated wave is smaller than the carrier wave, the power switch tube S1Off, S2Turn-off, diode D2Turn-off, diode D1Turning on and inputting power UinInductor L1Diode D1And a capacitor C2Forming a closed loop through the inductor L1Current of (I)L1And decreases. Capacitor C1Discharging and supplying power to the load.
FIG. 3 is a schematic diagram of a filter circuit according to the present embodiment, including an inductor L3And a capacitor C3Power switch tube S3And S4Inductance L3One end is connected with the node A, and the other end is connected with the power switch tube S 42 terminal and power switch tube S 31 terminal of, capacitor C3One end is connected with the node B, and the other end is connected with the power switch tube S4 End 1 of the power switch tube S3Is connected to node B.
FIG. 13 is a block diagram of a control circuit employed by the filter circuit of this embodiment, which is independent of the main circuit control, and employs a voltage-current dual closed-loop control, for the voltage loop, a capacitor C is taken3Voltage U onC3Comparing with expected voltage, PI regulating, and calculating out expected current reference value I to be compensated on main circuit DC side by power balanceL3*Controlled ofThe key point is that the voltage loop tracks the capacitor side C3Voltage and outputs a desired current I compensating for harmonics on the DC side of the main circuitL3And simultaneously, the current loop enables the harmonic current on the direct current side to reach the current expected value.
FIGS. 16 and 17 are simulated waveforms of the rectifier with active filtering added, and FIG. 15 is a harmonic current I on the DC sideL3And expected value IL3*The harmonic current tracks the expected current, and fig. 16 shows the output voltage waveform before filtering and the output voltage waveform after filtering, so that the output direct-current voltage ripple is obviously reduced, the filtering effect is good, the simulation example achieves the expected effect, and the control circuit of the active filter circuit provided by the invention is verified to be correct and feasible. The filter circuit modes comprise a mode one, a mode two, a mode three and a mode four, and the details are as follows:
mode one
As shown in fig. 8, the inductor current IL3Greater than 0, when the modulated wave is greater than the carrier wave, the power switch tube S4Off, S3Conducting; power switch tube S3Inductance L3A closed loop is formed by the inductor L and the load R3Discharge, current IL3Through a power switch tube S3The body diode freewheel is injected into the dc bus.
Mode two
As shown in fig. 9, the inductor current IL3Greater than 0, when the modulated wave is less than the carrier wave, the power switch tube S4Conduction, S3Turning off; capacitor C3Power switch tube S4Inductor L3A closed loop formed by the capacitor C and the load R3Discharge, inductance L3Charging, current IL3Through a power switch tube S4And injecting the direct current bus. Wherein the DC bus is node A-capacitor C1-a capacitance C2-a node B leg.
Modal three
As shown in fig. 10, the inductor current IL3Less than 0, and when the modulated wave is greater than the carrier wave, the power switch tube S3Conduction, S4Closed, power switch tube S3And a DC bus forming a closed loop from which current is drawnThe A terminal passes through an inductor L3And a power switch tube S3Flows to the B end of the direct current bus, and the energy on the bus passes through S3Injection inductor L3Inductance L3And (4) storing energy.
Mode four
As shown in fig. 11, the inductor current IL3Less than 0, when the modulated wave is less than the carrier wave, the power switch tube S3Closure, S4Conducting; inductor L3Capacitor C3Power switch tube S4And a DC bus to form a closed loop, current IL3Passing through inductor L at end A of direct current bus3Power switch tube S4Body diode and capacitor C3Flowing to the B end of the DC bus and an inductor L3Discharge energy, capacitance C3Energy is stored.
The embodiment has the following advantages:
1. compared with the traditional bridge rectifier circuit, the bridge arm direct connection problem and the switch tube body diode reverse recovery problem do not exist;
2. the main circuit of the embodiment adopts voltage and current double closed-loop control, has fast dynamic response, high input current power factor and stable output voltage, and has stronger inhibition capability on the fluctuation of a power supply and a load;
3. the modulation mode of the embodiment is half-cycle unipolar modulation, only one power switching tube works at high frequency in each half power frequency cycle, and the loss of the switching tube is small;
4. the circuit of the embodiment has higher boosting capacity, the output direct current bus voltage is more than twice of the peak voltage of the input power supply, and the circuit is suitable for high-voltage and high-power occasions;
5. the control mode of the filter circuit of the embodiment is independent of the main circuit, the current tracking expected value is compensated, the output voltage ripple is small, and the actual current of the current loop does not contain harmonic components;
6. active filtering is adopted in the embodiment, so that the capacitance of the capacitor at the side of the direct current bus is greatly reduced, the sizes of the inductor and the capacitor of the filter circuit are reduced, and the system loss is reduced.
The present invention and its embodiments have been described above schematically, without limitation, and what is shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. Therefore, if the person skilled in the art receives the teaching, without departing from the spirit of the invention, the person skilled in the art shall not inventively design the similar structural modes and embodiments to the technical solution, but shall fall within the scope of the invention.
Claims (8)
1. A low output ripple boost rectifier, comprising: the circuit comprises a main circuit and a filter circuit, wherein the main circuit comprises a power switch tube S1、S2Inductance L1、L2Capacitor C1、C2Diode D1And D2(ii) a AC power supply UinReference positive terminal and inductor L1And L2Is connected to an inductor L1The other end and a diode D1Cathode connected to inductor L2Another terminal of (1) and a diode D2Anode connected, diode D1The anodes are respectively connected with a power switch tube S2Terminal 2, capacitor C2Is connected to node B; diode D2The cathode is connected to the power switch tube S1Terminal 1 and capacitor C1Is connected to node a; capacitor C1And C2The other end of the switch is connected with an alternating current power supply UinA reference negative terminal of; wherein, the power switch tube S1And S2Are connected in anti-parallel with the diode at two ends; nodes a and B form an output; the filter circuit is connected between the nodes A and B.
2. The low output ripple boost rectifier of claim 1, wherein: the filter circuit is an active filter circuit and comprises an inductor L3Capacitor C3Power switch tube S3And S4Inductance L3One end is connected with the node A, and the other end is connected with the power switch tube S42 terminal and power switch tube S31 terminal of, capacitor C3One end is connected with the node B, and the other end is connected with the power switch tube S4End 1 of the power switch tube S3Is connected to node B.
3. The low output ripple boost rectifier of claim 2, wherein: the diode D1And D2Is a fast recovery diode.
4. The low output ripple boost rectifier of claim 3, wherein: and a load R is also connected between the nodes A and B.
5. The method of claim 4, wherein: the working principle of the rectifier in the positive and negative half waves of the sine modulation wave is the same;
in the positive half period of the input power supply, when the modulation wave is greater than the carrier wave, the power switch tube S is controlled2Conduction, S1Disconnected, AC power UinAnd a capacitor C2Through a switching tube S2For inductor L2Charging, flowing through the inductor L2Current of (I)L2Increase, capacitance C1Discharging to supply power to the load R;
when the modulated wave is less than the carrier wave, the power switch tube S is controlled1Off, S2Off, diode D2On, the capacitance C2Discharging and supplying power to the load R.
6. The method of claim 5, wherein the step-up rectifier comprises:
in the negative half period of the input power supply, when the modulation wave is greater than the carrier wave, the power switch tube S is controlled1Conduction, S2Disconnected, AC power UinAnd a capacitor C1Through a switching tube S1For inductor L1Charging, flowing through the inductor L1Current of (I)L1Increase, capacitance C2Discharging to supply power to the load R;
when the modulated wave is less than the carrier wave, the power switch tube S is controlled2Breaking, S1Off, diode D1On, the capacitanceC1Discharging and supplying power to the load.
7. The method of claim 6, wherein the step-up rectifier comprises:
the filter circuit control and the main circuit control are independent; at the inductor L3Current of (I)L3When the modulation wave is larger than 0 and the carrier wave is larger, the power switch tube S4Off, S3Conducting; power switch tube S3Inductance L3A closed loop is formed by the inductor L and the load R3Discharge, current IL3Through a power switch tube S3Injecting the body diode follow current into a direct current bus;
when the modulated wave is smaller than the carrier wave, the power switch tube S4Conduction, S3Turning off; capacitor C3Power switch tube S4Inductor L3A closed loop formed by the capacitor C and the load R3Discharge, inductance L3Charging, current IL3Through a power switch tube S4Injecting a direct current bus;
the direct current bus is a node A-a capacitor C1-a capacitance C2-a node B leg.
8. The method of claim 7, wherein the step-up rectifier comprises:
at the inductor L3Current of (I)L3When the modulation wave is less than 0 and greater than the carrier wave, the power switch tube S3Conduction, S4Closed, power switch tube S3And the direct current bus forms a closed loop, and current passes through an inductor L from the end A of the direct current bus3And a power switch tube S3Flows to the B end of the direct current bus, and the energy on the bus passes through S3Injection inductor L3Inductance L3Storing energy;
when the modulated wave is smaller than the carrier wave, the power switch tube S3Closure, S4Conducting; inductor L3Capacitor C3Power switch tube S4And a DC bus to form a closed loop, current IL3By direct currentThe A end of the bus passes through an inductor L3Power switch tube S4Body diode and capacitor C3Flowing to the B end of the DC bus and an inductor L3Discharge energy, capacitance C3Energy is stored.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN118117854A (en) * | 2024-04-24 | 2024-05-31 | 山东艾诺智能仪器有限公司 | High-efficiency alternating-current power supply with higher harmonic and control method thereof |
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