CN116317664A - Multi-bridge arm switching power amplifier circuit with direct-current offset sine wave output - Google Patents
Multi-bridge arm switching power amplifier circuit with direct-current offset sine wave output Download PDFInfo
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- CN116317664A CN116317664A CN202310226903.0A CN202310226903A CN116317664A CN 116317664 A CN116317664 A CN 116317664A CN 202310226903 A CN202310226903 A CN 202310226903A CN 116317664 A CN116317664 A CN 116317664A
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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
- 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
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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
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
- H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
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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
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- 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 multi-bridge arm switching power amplifier circuit with direct current bias sine wave output, which comprises a direct current source, a main circuit module and a filter circuit module, wherein the main circuit module is connected with the main circuit module; the main circuit module comprises N bridge arms which are mutually connected in parallel; the filter circuit module comprises an output filter capacitor, an output filter inductor and a load; the direct current source is connected with the midpoints of N parallel bridge arms respectively, the N parallel bridge arms are connected with the filter circuit module, and high-frequency sinusoidal voltage with bias is generated at the load through the modulation of the N parallel bridge arms. The single-switch tube has the characteristics of wide output sine frequency, high sine degree, low working frequency of the single-switch tube and small loss.
Description
Technical Field
The invention belongs to the technical field of high-frequency switching power amplification circuits, and particularly relates to a multi-bridge arm switching power amplification circuit with direct-current offset sine wave output.
Background
With the rapid development of hybrid electric vehicles and energy storage systems, the serial-parallel connection of lithium ion batteries and power converters is becoming more and more widely used.
In order to improve the performance of the battery and analyze the characteristics of the battery such as the charging state, the health state and the like under the influence of the switching frequency current, the alternating current impedance of the battery needs to be accurately understood and measured, and in order to measure the alternating current impedance of the battery, a high-frequency sinusoidal current of direct current needs to be superposed. A brand new high-frequency switching power amplifier circuit with adjustable direct-current offset sine wave output needs to be designed.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a multi-bridge arm switching power amplifier circuit with DC offset sine wave output, which is a high-frequency switching power amplifier circuit with offset-adjustable DC offset sine wave output and has the characteristics of wide output sine frequency, high sine degree, low single switching tube working frequency and small loss.
In order to achieve the technical purpose, the invention adopts the following technical scheme:
a multi-bridge arm switch power amplifier circuit with direct current bias sine wave output comprises a direct current source, a main circuit module and a filter circuit module, wherein the main circuit module comprises N bridge arms which are mutually connected in parallel;
the filter circuit module comprises an output filter capacitor, an output filter inductor and a load;
the direct current source is connected with the midpoints of N parallel bridge arms respectively, the N parallel bridge arms are connected with the filter circuit module, and high-frequency sinusoidal voltage with bias is generated at the load through the modulation of the N parallel bridge arms.
In order to optimize the technical scheme, the specific measures adopted further comprise:
the N-phase parallel bridge arms comprise 1-N-phase common N-phase bridge arms which are arranged in parallel, and each phase bridge arm has the same structure and comprises an upper bridge arm switch tube, a lower bridge arm switch tube, an upper switch tube body diode and a lower switch tube body diode.
The direct current source is formed by connecting an upper direct current voltage source V2 and a lower direct current voltage source V1 in series, wherein the positive electrode V2 of the upper direct current voltage source is connected with the drain electrode of an upper bridge arm switch tube of an N-phase bridge arm, and the negative electrode of the lower direct current voltage source V1 is connected with the positive stage of a diode Dn+1 and grounded.
The N-phase bridge arms are respectively and electrically connected with the cathode of the upper direct current voltage source V2 through diodes D1, D2, D3, … …, dn-1 and Dn which are mutually connected in parallel, anodes of the diodes D1, D2, D3, … …, dn-1 and Dn are respectively connected with the cathode of the upper direct current voltage source V2, and cathodes of the diodes D1, D2, D3, … …, dn-1 and Dn are respectively connected with the middle points of the bridge arms of the 1-N-phase bridge arms.
In the N-phase bridge arm, the 1-phase bridge arm is composed of an upper bridge arm switching tube Sa1, a lower bridge arm switching tube Sb1, an upper switching tube body diode Da1, and a lower switching tube body diode Db 1;
the 2-phase bridge arm is composed of an upper bridge arm switch tube Sa2, a lower bridge arm switch tube Sb2, an upper switch tube body diode Da2 and a lower switch tube body diode Db 2;
the 3-phase bridge arm is composed of an upper bridge arm switch tube Sa3, a lower bridge arm switch tube Sb3, an upper switch tube body diode Da3 and a lower switch tube body diode Db 3;
similarly, the N-1 phase bridge arm is composed of an upper bridge arm switch tube SaN-1, a lower bridge arm switch tube SbN-1, an upper switch tube body diode DaN-1 and a lower switch tube body diode DbN-1;
the N-phase bridge arm is composed of an upper bridge arm switching tube SaN, a lower bridge arm switching tube SbN, an upper switching tube body diode DaN, and a lower switching tube body diode DbN.
The 1-phase upper switching tube body diode Da1, the 2-phase upper switching tube body diode Da2, the 3-phase upper switching tube body diode Da3, … …, the N-1-phase upper switching tube body diode DaN-1 and the cathode of the N-phase upper switching tube body diode DaN are connected to the positive electrode of the upper direct current voltage source V2;
the anodes of the 1-phase upper switching diode body diode Da1, the 2-phase upper switching diode body diode Da2, the 3-phase upper switching diode body diode Da3, … … and the N-1-phase upper switching diode body diode DaN-1 and the N-phase upper switching diode body diode DaN are respectively and electrically connected to the cathodes of the 1-phase lower switching diode body diode Db1, the 2-phase lower switching diode body diode Db2, the 3-phase lower switching diode body diodes Db3, … … and the N-1-phase lower switching diode body diode DbN-1 and the N-phase lower switching diode body diode DbN in sequence;
the 1-phase lower switching diode Db1, 2-phase lower switching diode Db2, 3-phase lower switching diode Db3, … …, N-1-phase lower switching diode DbN-1, and N-phase lower switching diode DbN have their anodes electrically connected to the cathode of diode Dn+1, and the anode of diode Dn+1 is grounded.
The filter circuit module comprises an output filter capacitor C1, an output filter inductor L1 and a load R;
one end of the output filter inductor L1 is connected with the source electrode of the N-phase bridge arm lower switching tube, the other end of the output filter inductor L1 is connected with one end of the output filter capacitor C1, the other end of the output filter capacitor C1 is grounded, and the two ends of the output filter capacitor C1 are connected with a load R in parallel.
The invention has the following beneficial effects:
(1) The frequency of the whole circuit is improved through multiple bridge arms, the size of the filter is reduced, and the efficiency is improved;
(2) The output band DC offset sine wave voltage is adjustable, and the output power is increased;
(3) The output sine wave has small harmonic content and high sine degree;
(4) The modulating sine wave can be modulated at a wide frequency, the maximum frequency can be up to 200k, the working frequency of a single switching tube is low, and the frequency of the output sine wave is wide.
Drawings
FIG. 1 is a schematic diagram of a multi-leg switching power amplifier circuit with DC offset sine wave output according to the present invention;
FIG. 2 is a diagram of the structure and the working mode of a 6-way multi-bridge arm switching power amplifier circuit with bias in the embodiment of the invention;
fig. 3 is a timing diagram of the switching tubes of the multi-leg open Guan Gong discharge circuit with bias in an embodiment of the invention.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Although the steps of the present invention are arranged by reference numerals, the order of the steps is not limited, and the relative order of the steps may be adjusted unless the order of the steps is explicitly stated or the execution of a step requires other steps as a basis. It is to be understood that the term "and/or" as used herein relates to and encompasses any and all possible combinations of one or more of the associated listed items.
As shown in FIG. 1, the multi-bridge arm switching power amplifier circuit with direct current bias sine wave output comprises a direct current source, a main circuit module and a filter circuit module; the main circuit module mainly comprises N bridge arms which are mutually connected in parallel;
the filter circuit module comprises an output filter capacitor, an output filter inductor and a load;
the direct current source is connected with the midpoints of N parallel bridge arms respectively, the N parallel bridge arms are connected with the filter circuit module, and high-frequency sinusoidal voltage with bias is generated at the load through the modulation of the N parallel bridge arms.
The N-phase parallel bridge arms comprise 1-N-phase common N-phase bridge arms which are arranged in parallel, and each phase bridge arm has the same structure and comprises an upper bridge arm switch tube, a lower bridge arm switch tube, an upper switch tube body diode and a lower switch tube body diode.
In the embodiment, the circuit adopts a SPWM modulation mode with direct bias, the frequency of the modulation wave is a sine wave in a wide range, the maximum frequency is 200k, the frequency of a single switching tube is not high, the frequency is always kept to be 1/N of the carrier frequency, and the switching loss is reduced. The high-frequency sinusoidal voltage with bias is generated at the load through modulation, the harmonic content is less than that of other circuits, the sine degree is high, the output ripple voltage frequency is the same as the modulation wave frequency, and the volume of the filter inductance capacitance is reduced.
The electrical component specifically involved includes: the power switch comprises 2N power switch tubes, 2N power switch tube body diodes, n+1 diodes, an output filter capacitor, an output filter inductor, 2 direct current power supplies and a load.
Specifically, the direct current source is formed by connecting an upper direct current voltage source V2 and a lower direct current voltage source V1 in series, wherein the positive electrode V2 of the upper direct current voltage source is connected with the drain electrode of an upper bridge arm switch tube of the N-phase bridge arm, and the negative electrode of the lower direct current voltage source V1 is connected with the positive stage of the diode Dn+1 and grounded.
The N-phase bridge arm is electrically connected with the cathode of the upper direct current voltage source V2 through diodes D1, D2, D3, … …, dn-1 and Dn which are connected in parallel, anodes of the diodes D1, D2, D3, … …, dn-1 and Dn are connected with the cathode of the upper direct current voltage source V2, and cathodes of the diodes D1, D2, D3, … … and Dn-1 are connected with the middle points of the bridge arms of the 1-N-phase bridge arm respectively.
In the N-phase bridge arm, a 1-phase bridge arm is composed of an upper bridge arm switch tube Sa1, a lower bridge arm switch tube Sb1, an upper switch tube body diode Da1 and a lower switch tube body diode Db 1;
the 2-phase bridge arm is composed of an upper bridge arm switch tube Sa2, a lower bridge arm switch tube Sb2, an upper switch tube body diode Da2 and a lower switch tube body diode Db 2;
the 3-phase bridge arm is composed of an upper bridge arm switch tube Sa3, a lower bridge arm switch tube Sb3, an upper switch tube body diode Da3 and a lower switch tube body diode Db 3;
similarly, the N-1 phase bridge arm is composed of an upper bridge arm switch tube SaN-1, a lower bridge arm switch tube SbN-1, an upper switch tube body diode DaN-1 and a lower switch tube body diode DbN-1;
the N-phase bridge arm is composed of an upper bridge arm switching tube SaN, a lower bridge arm switching tube SbN, an upper switching tube body diode DaN, and a lower switching tube body diode DbN.
The 1-phase upper switching tube body diode Da1, the 2-phase upper switching tube body diode Da2, the 3-phase upper switching tube body diodes Da3 and … …, the N-1-phase upper switching tube body diode DaN-1 and the cathode of the N-phase upper switching tube body diode DaN are connected to the positive electrode of an upper direct current voltage source V2 (a bus upper voltage source V2);
the anodes of the 1-phase upper switching diode body diode Da1, the 2-phase upper switching diode body diode Da2, the 3-phase upper switching diode body diode Da3, … … and the N-1-phase upper switching diode body diode DaN-1 and the N-phase upper switching diode body diode DaN are respectively and electrically connected to the cathodes of the 1-phase lower switching diode body diode Db1, the 2-phase lower switching diode body diode Db2, the 3-phase lower switching diode body diodes Db3, … … and the N-1-phase lower switching diode body diode DbN-1 and the N-phase lower switching diode body diode DbN in sequence;
the 1-phase lower switching diode Db1, 2-phase lower switching diode Db2, 3-phase lower switching diode Db3, … …, N-1-phase lower switching diode DbN-1, and N-phase lower switching diode DbN have their anodes electrically connected to the cathode of diode Dn+1, and the anode of diode Dn+1 is grounded.
The filter circuit module comprises an output filter capacitor C1, an output filter inductor L1 and a load R;
one end of the output filter inductor L1 is connected with the source electrode of the N-phase bridge arm lower switching tube, the other end of the output filter inductor L1 is connected with one end of the output filter capacitor C1, the other end of the output filter capacitor C1 is grounded, and the two ends of the output filter capacitor C1 are connected with a load R in parallel.
Example 1
Taking a six-phase bridge arm as an example, as shown in fig. 2, sa1 to Sf1 represent switching tubes on each bridge arm; sa2 to Sf2 represent each bridge arm lower switching tube; da1 to Df1 represent upper bridge arm switching tube body diodes; da2 to Df2 represent the switching tube body diodes of each lower bridge arm; da3 to Df3 represent bridge arm midpoint diodes, preventing current backflow; v2 and V1 represent upper and lower voltage sources; the D4 diode prevents the upper and lower switching tubes of the bridge arm from simultaneously conducting the short circuit of the voltage source; c1 represents an output filter capacitance; l1 represents an output filter inductance; r1 represents a load.
The anodes of the upper direct-current voltage sources are respectively connected to the drains of six-phase bridge arm upper switching tubes Sa1 to Sf1, the sources of the six-phase bridge arm upper switching tubes Sa1 to Sf1 are respectively connected with the drains of six-phase bridge arm lower switching tubes Sa2 to Sf2, the sources of the six-phase bridge arm lower switching tubes Sa2 to Sf2 are connected with the cathode of a diode D4, and the anode of the diode D4 is connected with the cathode of a lower voltage source V1. The upper diode of the six-phase bridge arm is respectively connected with the upper switching tube in parallel, the lower diode is respectively connected with the lower switching tube in parallel, the cathode of the diode is connected with the drain electrode of the switching tube, and the anode D4 of the diode is connected with the cathode of the diode. One end of the output filter inductor is connected with the source electrode of the six-phase bridge arm lower switch tube, the other end of the output filter inductor is connected with the output filter capacitor, and one end of the output filter capacitor is connected with the output filter inductor, and the other end of the output filter capacitor is grounded.
The working period of the embodiment is divided into two working intervals at the same time: (1) All lower bridge arm switching tubes in the first half period are switched on according to the time sequence from Sa2 to Sf2 in fig. 3, and current passes through a lower voltage source, a lower bridge arm, an output filter inductor and an output filter capacitor to reach a load; (2) And in the second half period, all the lower bridge arm switching tubes are kept on, all the upper bridge arm switching tubes are turned on according to the time sequence Sa1 to Sf1 in fig. 3, and current passes through the upper and lower voltage sources, the upper bridge arm, the lower bridge arm, the output filter inductor and the output filter capacitor to reach a load.
The specific working principle and working mode of the present invention will be described with reference to fig. 2 and 3.
Working mode 1: as shown in fig. 3, after the lower switching tube is turned on, the upper switching tube is turned on again, and a high-voltage modulation signal can be formed by virtue of modulation of the upper switching tube, so that the turn-on periods of all the lower switching tubes are the same, and the same phase difference is maintained.
Working mode 2: as shown in fig. 3, the upper arm switching transistors Sa1 to Sf1 are turned off, and the lower arm switching transistors are turned on at the timings of Sa2 to Sf2 in fig. 3, and the periods of the signal switching transistors are the same, forming a low voltage modulation signal.
As can be seen from the above description, the present invention is a multi-bridge arm switch power amplifier circuit with bias, which has the following advantages:
(1) The frequency of the whole circuit is improved through multiple bridge arms, the size of the filter is reduced, and the efficiency is improved;
(2) The output band DC offset sine wave voltage is adjustable, and the output power is increased.
(3) The output sine wave has small harmonic content and high sine degree.
(4) The modulating sine wave can be modulated at a wide frequency, the maximum frequency can be up to 200k, the working frequency of a single switching tube is low, and the frequency of the output sine wave is wide.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.
Claims (7)
1. A multi-bridge arm switching power amplifier circuit with direct current bias sine wave output comprises a direct current source, a main circuit module and a filter circuit module; the main circuit module is characterized by comprising N bridge arms which are mutually connected in parallel;
the filter circuit module comprises an output filter capacitor, an output filter inductor and a load;
the direct current source is connected with the midpoints of N parallel bridge arms respectively, the N parallel bridge arms are connected with the filter circuit module, and high-frequency sinusoidal voltage with bias is generated at the load through the modulation of the N parallel bridge arms.
2. The multi-bridge arm switching power amplifier circuit with the direct current offset sine wave output according to claim 1, wherein the N-phase parallel bridge arms comprise 1-N-phase common N-phase bridge arms which are arranged in parallel, and each phase of bridge arm has the same structure and comprises an upper bridge arm switching tube, a lower bridge arm switching tube, an upper switching tube body diode and a lower switching tube body diode.
3. The multi-bridge arm switching power amplifier circuit with the direct current bias sine wave output according to claim 2, wherein the direct current source is composed of an upper direct current voltage source V2 and a lower direct current voltage source V1 which are connected in series, a positive electrode V2 of the upper direct current voltage source is connected with a drain electrode of an upper bridge arm switching tube of an N-phase bridge arm, and a negative electrode of the lower direct current voltage source V1 is connected with a positive stage of a diode Dn+1 and grounded.
4. A multi-leg switching power amplifier circuit with dc offset sine wave output according to claim 3, wherein the N-phase legs are electrically connected to the negative pole of the upper dc voltage source V2 through diodes D1, D2, D3, … …, dn-1, dn connected in parallel, respectively, the anodes of the diodes D1, D2, D3, … …, dn-1, dn are connected to the negative pole of the upper dc voltage source V2, and the cathodes of the diodes D1, D2, D3, … …, dn-1, dn are connected to the bridge arm midpoints of the 1-N phase legs, respectively.
5. The multi-leg switching power amplifier circuit with dc offset sine wave output according to claim 4, wherein, in the N-phase legs, the 1-phase leg is composed of an upper leg switching tube Sa1, a lower leg switching tube Sb1, an upper switching tube body diode Da1, and a lower switching tube body diode Db 1;
the 2-phase bridge arm is composed of an upper bridge arm switch tube Sa2, a lower bridge arm switch tube Sb2, an upper switch tube body diode Da2 and a lower switch tube body diode Db 2;
the 3-phase bridge arm is composed of an upper bridge arm switch tube Sa3, a lower bridge arm switch tube Sb3, an upper switch tube body diode Da3 and a lower switch tube body diode Db 3;
similarly, the N-1 phase bridge arm is composed of an upper bridge arm switch tube SaN-1, a lower bridge arm switch tube SbN-1, an upper switch tube body diode DaN-1 and a lower switch tube body diode DbN-1;
the N-phase bridge arm is composed of an upper bridge arm switching tube SaN, a lower bridge arm switching tube SbN, an upper switching tube body diode DaN, and a lower switching tube body diode DbN.
6. The multi-leg switching power amplifier circuit with dc offset sine wave output according to claim 5, wherein the 1-phase upper switching body diode Da1, 2-phase upper switching body diode Da2, 3-phase upper switching body diode Da3, … …, N-1-phase upper switching body diode DaN-1, the cathode of N-phase upper switching body diode DaN is connected to the positive electrode of the upper dc voltage source V2;
the anodes of the 1-phase upper switching diode body diode Da1, the 2-phase upper switching diode body diode Da2, the 3-phase upper switching diode body diode Da3, … … and the N-1-phase upper switching diode body diode DaN-1 and the N-phase upper switching diode body diode DaN are respectively and electrically connected to the cathodes of the 1-phase lower switching diode body diode Db1, the 2-phase lower switching diode body diode Db2, the 3-phase lower switching diode body diodes Db3, … … and the N-1-phase lower switching diode body diode DbN-1 and the N-phase lower switching diode body diode DbN in sequence;
the 1-phase lower switching diode Db1, 2-phase lower switching diode Db2, 3-phase lower switching diode Db3, … …, N-1-phase lower switching diode DbN-1, and N-phase lower switching diode DbN have their anodes electrically connected to the cathode of diode Dn+1, and the anode of diode Dn+1 is grounded.
7. The multi-bridge arm switching power amplifier circuit with direct current offset sine wave output according to claim 2, wherein the filter circuit module comprises an output filter capacitor C1, an output filter inductor L1 and a load R;
one end of the output filter inductor L1 is connected with the source electrode of the N-phase bridge arm lower switching tube, the other end of the output filter inductor L1 is connected with one end of the output filter capacitor C1, the other end of the output filter capacitor C1 is grounded, and the two ends of the output filter capacitor C1 are connected with a load R in parallel.
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