An inverter circuit for special communication

Abstract

The present application discloses an inverter circuit for special communication, including a DC-DC boost module, a DC-AC inverter module and an auxiliary power supply module; the DC-DC boost module includes a boost power circuit and a boost control circuit, and the DC-AC inverter module includes an inverter power circuit and an inverter control circuit. The first DC power supply is boosted and rectified by the boost power circuit, and is input into the inverter power circuit. The boosted first DC power supply is subjected to high-frequency inversion, and after obtaining the high-frequency pulse voltage, it is filtered to finally obtain the target AC power supply, thereby realizing the conversion function from DC to AC. Auxiliary power supply is also provided by the auxiliary power supply module, thereby improving the reliability of power supply; the circuit is protected by the protection circuit, thereby improving the overall safety performance of the inverter; the entire circuit is also feedback-controlled by the boost control circuit and the inverter control circuit, so that the output target AC power supply has strong dynamic and static characteristics and stronger environmental adaptability.

Description

Technical Field

[0001] The utility model relates to the technical field of communication power supply, in particular to an inverter circuit used for special communication. Background Art

[0002] In the existing technology, the power supply system for special communications (including emergency communications, military communications, maritime communications, etc.) usually uses diesel generators for power supply, and then uses a vehicle-mounted integrated power supply to form a DC uninterruptible power supply system at the end. However, this method not only has a single power supply form and is incompatible with new energy forms such as photovoltaics, wind power generation, and fuel cells, but also lacks AC power supply, and cannot meet the AC power supply needs of in-vehicle equipment and individual AC equipment. The power supply efficiency is poor and the power supply reliability is not high.

[0003] In order to meet the AC power supply needs of special communication power supply systems, inverters and other products are generally preferred. However, most existing inverters are aimed at general civilian fields and have many problems, such as low safety, poor environmental adaptability, low conversion efficiency, high failure rate, and poor reliability. Utility Model Content

[0004] The utility model provides an inverter circuit for special communication, which solves the problems of low safety, poor environmental adaptability, low conversion efficiency, high failure rate, poor reliability, etc. of the existing inverter when used in the field of special communication.

[0005] In order to solve the above technical problems, the technical solution adopted by the utility model is to provide an inverter circuit for special communication, including a DC-DC boost module, a DC-AC inverter module and an auxiliary power supply module; the DC-DC boost module includes a boost power circuit and a boost control circuit, and the DC-AC inverter module includes an inverter power circuit and an inverter control circuit; the boost power circuit is electrically connected to the boost control circuit and the inverter power circuit respectively, and the input end of the boost power circuit is used to access a first DC power supply; the inverter power circuit is also electrically connected to the inverter control circuit, and the output end of the inverter power circuit is used to output a target AC power supply; the auxiliary power supply module is electrically connected to the DC-DC boost module and the DC-AC inverter module respectively, and the input end of the auxiliary power supply module is used to access the first DC power supply.

[0006] In some embodiments, the boost power circuit includes a full-bridge soft switching conversion circuit and a boost transformer; the full-bridge soft switching conversion circuit includes a first bridge arm and a second bridge arm, the first bridge arm includes four first MOS tubes, and the second bridge arm includes four second MOS tubes; the drain of the first MOS tube is used to connect to the first DC power supply, the gate of the first MOS tube is electrically connected to the positive electrode of the first switching diode, and the source of the first MOS tube is electrically connected to the input end of the boost transformer; the drain of the second MOS tube is electrically connected to the input end of the boost transformer, the gate of the second MOS tube is electrically connected to the positive electrode of the second switching diode, and the source of the second MOS tube is grounded.

[0007] In some embodiments, the boost power circuit also includes a rectifier circuit, which includes a first rectifier diode, a second rectifier diode, a third rectifier diode, a fourth rectifier diode, a first output capacitor and a second output capacitor; the positive electrode of the first rectifier diode, the positive electrode of the third rectifier diode, the negative electrode of the second rectifier diode and the negative electrode of the fourth rectifier diode are respectively electrically connected to the output end of the boost transformer, the negative electrode of the first rectifier diode and the negative electrode of the third rectifier diode are respectively electrically connected to the positive electrode of the first output capacitor, the positive electrode of the second rectifier diode and the positive electrode of the fourth rectifier diode are respectively electrically connected to the negative electrode of the second output capacitor, and the positive electrode of the first output capacitor and the negative electrode of the second output capacitor are also respectively electrically connected to the inverter power circuit.

[0008] In some embodiments, the boost control circuit includes a boost control chip SG3525; the soft start end of the boost control chip SG3525 is electrically connected to the collector of the boost control transistor, the base of the boost control transistor is electrically connected to the anode of the first voltage regulator diode and then electrically connected to the boost power circuit, and the emitter of the boost control transistor is grounded; the power supply voltage end of the boost control chip SG3525 is electrically connected to the auxiliary power supply module.

[0009] In some embodiments, the DC-DC boost module also includes a boost drive circuit, and the boost drive circuit includes a first boost drive circuit and a second boost drive circuit; the first boost drive circuit includes a first boost drive chip UCC27200; the high-end output end, the high-end source connection end and the low-end output end of the first boost drive chip UCC27200 are respectively electrically connected to the boost power circuit; the high-end input end and the low-end input end of the first boost drive chip UCC27200 are respectively electrically connected to the boost control circuit; the power supply end of the first boost drive chip UCC27200 is electrically connected to the auxiliary power supply module; the circuit composition of the second boost drive circuit is the same as the circuit composition of the first boost drive circuit, and the second boost drive circuit is respectively electrically connected to the boost power circuit, the boost control circuit and the auxiliary power supply module.

[0010] In some embodiments, the DC-AC inverter module also includes an inverter drive circuit, which is electrically connected to the inverter power circuit, the inverter control circuit and the auxiliary power supply module respectively, and the circuit composition of the inverter drive circuit is the same as the circuit composition of the boost drive circuit; the circuit composition of the inverter control circuit is the same as the circuit composition of the boost control circuit.

[0011] In some embodiments, the inverter power circuit includes a first insulated gate bipolar transistor, a second insulated gate bipolar transistor, a third insulated gate bipolar transistor, a fourth insulated gate bipolar transistor, a filter inductor and a filter capacitor; the emitter of the first insulated gate bipolar transistor and the collector of the third insulated gate bipolar transistor are respectively electrically connected to the first end of the filter inductor, and the emitter of the second insulated gate bipolar transistor and the collector of the fourth insulated gate bipolar transistor are respectively electrically connected to the third end of the filter inductor; the collectors of the first insulated gate bipolar transistor and the second insulated gate bipolar transistor are respectively electrically connected to the boost power circuit, and the emitters of the third insulated gate bipolar transistor and the fourth insulated gate bipolar transistor are respectively electrically connected to the boost power circuit; the filter inductor is also electrically connected to the filter capacitor, and the two ends of the filter capacitor equivalently output the target AC power supply.

[0012] In some embodiments, the auxiliary power supply module includes a first auxiliary power supply circuit, which includes a buck converter chip TPS5410; the power input end of the buck converter chip TPS5410 is used to connect to the first DC power supply; the high-end switch drive end, the high-end switch output end and the output voltage feedback end of the buck converter chip TPS5410 are electrically connected to the boost control circuit and the boost drive circuit respectively; the control enable end of the buck converter chip TPS5410 is electrically connected to the microcontroller.

[0013] In some embodiments, the auxiliary power supply module also includes a second auxiliary power supply circuit and a third auxiliary power supply circuit; the second auxiliary power supply circuit includes a flyback conversion chip LT8302, and the power input end of the flyback conversion chip LT8302 is used to connect to the first DC power supply; the switch limit end and the output voltage feedback end of the flyback conversion chip LT8302 are electrically connected to the inverter control circuit respectively; the enable end of the flyback conversion chip LT8302 is electrically connected to the single-chip microcomputer; the circuit composition of the third auxiliary power supply circuit is the same as the circuit composition of the second auxiliary power supply circuit, and the third auxiliary power supply circuit is electrically connected to the inverter drive circuit.

[0014] In some embodiments, a protection circuit is also included; the protection circuit includes a photocoupler and a second zener diode, the first end of the photocoupler is electrically connected to the second auxiliary power supply circuit; the second end of the photocoupler is electrically connected to the cathode of the second zener diode, the anode of the second zener diode is grounded, and the boost power circuit is also electrically connected at the electrical connection between the second end of the photocoupler and the second zener diode; the fourth end of the photocoupler is electrically connected to the boost control circuit and the inverter control circuit, respectively.

[0015] The beneficial effects of the utility model are as follows: the utility model discloses an inverter circuit for special communication, comprising a DC-DC boost module, a DC-AC inverter module and an auxiliary power supply module; the DC-DC boost module comprises a boost power circuit and a boost control circuit, and the DC-AC inverter module comprises an inverter power circuit and an inverter control circuit; the boost power circuit is electrically connected to the boost control circuit and the inverter power circuit respectively, and the input end of the boost power circuit is used to access a first DC power supply; the inverter power circuit is also electrically connected to the inverter control circuit, and the output end of the inverter power circuit is used to output a target AC power supply; the auxiliary power supply module is electrically connected to the DC-DC boost module and the DC-AC inverter module respectively, and the input end of the auxiliary power supply module is used to access the first DC power supply. The utility model uses the boost power circuit of the DC-DC boost module to boost and rectify the input first DC power supply, and then inputs it into the inverter power circuit in the DC-AC inverter module, performs high-frequency inversion on the boosted first DC power supply, obtains the high-frequency pulse voltage, and then filters the high-frequency pulse voltage, and finally obtains the target AC power supply in the form of a sine wave, thereby realizing the conversion function from DC to AC. The utility model also uses the auxiliary power supply module to provide auxiliary power supply, thereby improving the reliability of power supply; uses the protection circuit to protect the DC-DC boost module and the DC-AC inverter module, thereby improving the overall safety performance of the inverter; and also uses the boost control circuit and the inverter control circuit to feedback control the entire circuit, thereby making the output target AC power supply have stronger dynamic and static characteristics and stronger environmental adaptability. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a principle block diagram of an inverter circuit for special communications of the utility model;

[0017] Figure 2 It is a schematic diagram of a boost power circuit in an inverter circuit for special communications of the utility model;

[0018] Figure 3 It is a schematic diagram of an inverter power circuit in an inverter circuit for special communication of the utility model;

[0019] Figure 4 It is a schematic diagram of a boost control circuit in an inverter circuit for special communications of the utility model;

[0020] Figure 5 It is a schematic diagram of a boost driving circuit in an inverter circuit for special communication of the utility model;

[0021] Figure 6 It is a schematic diagram of a protection circuit in an inverter circuit for special communication of the utility model;

[0022] Figure 7 It is a schematic diagram of a first auxiliary power supply circuit in an inverter circuit for special communication of the utility model;

[0023] Figure 8 It is a schematic diagram of a second auxiliary power supply circuit in an inverter circuit for special communication of the utility model;

[0024] Fig. 9 The utility model is a schematic diagram of a third auxiliary power supply circuit in an inverter circuit for special communication. DETAILED DESCRIPTION

[0025] In order to facilitate the understanding of the present invention, the present invention is described in more detail below in conjunction with the accompanying drawings and specific embodiments. The accompanying drawings provide preferred embodiments of the present invention. However, the present invention can be implemented in many different forms and is not limited to the embodiments described in this specification. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0026] It should be noted that, unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used in this specification includes any and all combinations of one or more related listed items.

[0027] like Figure 1 As shown, the inverter circuit for special communication of the utility model includes a DC-DC boost module 1, a DC-AC inverter module 2, an auxiliary power module 3 and a protection circuit 4. The DC-DC boost module 1 includes a boost power circuit 11 and a boost control circuit 12, and the DC-AC inverter module 2 includes an inverter power circuit 21 and an inverter control circuit 22.

[0028] The boost power circuit 11 is electrically connected to the boost control circuit 12 and the inverter power circuit 21, respectively, and the input end of the boost power circuit 11 is used to access the first DC power supply 5. The inverter power circuit 21 is also electrically connected to the inverter control circuit 22, and the output end of the inverter power circuit 21 is used to output the target AC power supply 6. The auxiliary power supply module 3 is electrically connected to the DC-DC boost module 1 and the DC-AC inverter module 2, respectively, and the input end of the auxiliary power supply module 3 is used to access the first DC power supply 5. The protection circuit 4 is electrically connected to the DC-DC boost module 1 and the DC-AC inverter module 2, respectively.

[0029] The utility model uses the boost power circuit 11 of the DC-DC boost module 1 to boost and rectify the input first DC power supply 5, and then inputs it into the inverter power circuit 21 in the DC-AC inverter module 2, performs high-frequency inversion on the boosted first DC power supply 5, obtains the high-frequency pulse voltage, and then filters the high-frequency pulse voltage, and finally obtains the target AC power supply 6 in the form of a sine wave, thereby realizing the conversion function from DC to AC. The utility model also uses the auxiliary power supply module 3 to provide auxiliary power supply, thereby improving the reliability of power supply; uses the protection circuit 4 to protect the DC-DC boost module 1 and the DC-AC inverter module 2, thereby improving the safety performance of the inverter; and uses the boost control circuit 12 and the inverter control circuit 22 to feedback control the entire circuit, thereby making the output target AC power supply 6 have strong dynamic and static characteristics and strong adaptability.

[0030] Further, combined with Figure 1 , Figure 2 As shown, in this embodiment, the boost power circuit 11 includes a full-bridge soft switching conversion circuit, a boost transformer T1A and a rectifier circuit.

[0031] Specifically, the full-bridge soft switching conversion circuit includes a first bridge arm and a second bridge arm, the first bridge arm includes four first MOS tubes (Q6A, Q7A, Q4A, Q5A), and the second bridge arm includes four second MOS tubes (Q12A, Q13A, Q8A, Q9A). The drain of the first MOS tube (Q6A, Q7A, Q4A, Q5A) is connected to the first DC power supply 5 through a resettable fuse F3A, the gate of the first MOS tube (Q6A, Q7A, Q4A, Q5A) is electrically connected to the positive electrode of the first switch diode (D4A, D7A, D8A, D9A), and the source of the first MOS tube (Q6A, Q7A, Q4A, Q5A) is electrically connected to the input end (1, 2) of the step-up transformer T1A. The drains of the second MOS tubes (Q12A, Q13A, Q8A, Q9A) are respectively electrically connected to the input ends (1, 2) of the step-up transformer T1A, the gates of the second MOS tubes (Q12A, Q13A, Q8A, Q9A) are respectively electrically connected to the positive electrodes of the second switching diodes (D12A, D13A, D14A, D15A), and the sources of the second MOS tubes (Q12A, Q13A, Q8A, Q9A) are grounded.

[0032] The rectifier circuit includes a first rectifier diode D5A, a second rectifier diode D16A, a third rectifier diode D6A, a fourth rectifier diode D17A, a first output capacitor C30A, and a second output capacitor C41A. The anode of the first rectifier diode D5A, the anode of the third rectifier diode D6A, the cathode of the second rectifier diode D16A, and the cathode of the fourth rectifier diode D17A are electrically connected to the output end (3, 4) of the step-up transformer T1A, respectively, the cathode of the first rectifier diode D5A and the cathode of the third rectifier diode D6A are electrically connected to the anode of the first output capacitor C30A, respectively, the anode of the second rectifier diode D16A and the cathode of the fourth rectifier diode D17A are electrically connected to the cathode of the second output capacitor C41A, respectively, and the anode of the first output capacitor C30A and the cathode of the second output capacitor C41A are also electrically connected to the output end (3, 4) of the step-up transformer T1A, respectively. Figure 3 The inverter power circuit 21 is electrically connected.

[0033] Further, combined with Figure 1 , Figure 3 As shown, in this embodiment, the inverter power circuit 21 includes a first insulated gate bipolar transistor Q2A, a second insulated gate bipolar transistor Q3A, a third insulated gate bipolar transistor Q10A, a fourth insulated gate bipolar transistor Q11A, a filter inductor T2A and a filter capacitor C37A.

[0034] Specifically, the control electrodes of the first insulated gate bipolar transistor Q2A, the second insulated gate bipolar transistor Q3A, the third insulated gate bipolar transistor Q10A and the fourth insulated gate bipolar transistor Q11A are electrically connected to the positive electrodes of the diodes (D2A, D3A, D10A, D11A), respectively, the emitter of the first insulated gate bipolar transistor Q2A and the collector of the third insulated gate bipolar transistor Q10A are electrically connected to the first end 1 of the filter inductor T2A, respectively, the emitter of the second insulated gate bipolar transistor Q3A and the collector of the fourth insulated gate bipolar transistor Q11A are electrically connected to the third end 3 of the filter inductor T2A, respectively, and the collector of the first insulated gate bipolar transistor Q2A and the collector of the second insulated gate bipolar transistor Q3A are electrically connected to the third end 4 of the filter inductor T2A, respectively. Figure 2 The boost power circuit 11 is electrically connected to the third insulated gate bipolar transistor Q10A and the emitter of the fourth insulated gate bipolar transistor Q11A are respectively connected to Figure 2 The second end 2 and the fourth end 4 of the filter inductor T2A are electrically connected to the filter capacitor C37A respectively. The two ends of the filter capacitor C37A are equivalent to outputting the target AC power supply 6.

[0035] Further, combined with Figure 1 , Figure 4 As shown, in this embodiment, the boost control circuit 12 includes a boost control chip U18A, and the model of the boost control chip U18A is SG3525.

[0036] Specifically, the soft start terminal SOFTSTART of the boost control chip U18A is electrically connected to the collector 3 of the boost control transistor Q30A; the base 1 of the boost control transistor Q30A is electrically connected to a resistor R178A and then to the positive electrode of the first voltage zener diode D50A; the negative electrode of the first voltage zener diode D50A is electrically connected to a resistor R180A and then to the positive electrode of the first voltage zener diode D50A; Figure 2 The boost power circuit 11 is electrically connected; the emitter 2 of the boost control transistor Q30A is grounded. The compensation signal input terminal Compn of the boost control chip U18A is connected to Figure 6 The power supply voltage terminal VCC of the boost control chip U18A is electrically connected to the protection circuit 4. Figure 7 The output terminal OUTA and the output terminal OUTB of the boost control chip U18A are respectively connected to the first auxiliary power circuit of the auxiliary power module 3. Figure 5 The boost drive circuit is electrically connected.

[0037] The circuit composition of the inverter control circuit 22 is the same as that of the boost control circuit 12 , and the details can be referred to above, which will not be described again here.

[0038] Further, combined with Figure 1 , Figure 5As shown, in this embodiment, the DC-DC boost module 1 also includes a boost drive circuit, and the boost drive circuit includes a first boost drive circuit and a second boost drive circuit. The first boost drive circuit includes a first boost drive chip U6A, and the model of the first boost drive chip U6A is UCC27200; the second boost drive circuit includes a second boost drive chip U19A, and the model of the second boost drive chip U19A is also UCC27200.

[0039] Specifically, the high-end output terminal HO, the high-end source connection terminal HS and the low-end output terminal LO of the first boost driver chip U6A are respectively connected to Figure 2 A capacitor C68A is electrically connected between the high-side source connection terminal HS and the high-side bootstrap power supply terminal HB of the first boost driver chip U6A. The high-side input terminal HI and the low-side input terminal LI of the first boost driver chip U6A are respectively connected to Figure 4 The power supply terminal VDD of the first boost driver chip U6A is electrically connected to the boost control circuit 12. Figure 7 The first auxiliary power supply circuit of the auxiliary power supply module 3 is electrically connected; the power supply terminal VDD of the first boost driver chip U6A and the first auxiliary power supply circuit are also electrically connected to the capacitor C43A and then grounded, and the power supply terminal VDD of the first boost driver chip U6A is also electrically connected to the capacitor C44A and then grounded. The circuit composition of the second boost driver circuit is the same as the circuit composition of the first boost driver circuit. The second boost driver circuit is electrically connected to the boost power circuit 11, the boost control circuit 12 and the auxiliary power supply module 3 respectively. For details, please refer to Figure 5 , I will not go into details here.

[0040] In this embodiment, the DC-AC inverter module 2 further includes an inverter drive circuit. Figure 3 The inverter power circuit 21, the inverter control circuit 22 and the auxiliary power supply module 3 are electrically connected. The circuit composition of the inverter drive circuit is the same as the circuit composition of the above-mentioned boost drive circuit, which will not be repeated here.

[0041] Further, combined with Figure 1 , Figure 6 As shown, in this embodiment, the protection circuit 4 includes a photocoupler U3A and a second voltage regulator diode Q15A, and the model of the photocoupler U3A is FODM8801A.

[0042] Specifically, the first terminal 1 of the photocoupler U3A is electrically connected to a resistor R44A. Figure 8The second auxiliary power supply circuit is electrically connected to the photoelectric coupler U3A; capacitors C45A and C46A are connected in parallel at the electrical connection between the resistor R44A and the second auxiliary power supply circuit and then grounded. A resistor R51A is electrically connected between the first end 1 and the second end 2 of the photoelectric coupler U3A. The second end 2 of the photoelectric coupler U3A is electrically connected to the cathode of the second voltage zener diode Q15A, and the anode of the second voltage zener diode Q15A is grounded; resistors R53A, R54A, R52A and R48A are electrically connected at the electrical connection between the second end 2 of the photoelectric coupler U3A and the second voltage zener diode Q15A and then grounded. Figure 2 The boost power circuit 11 is electrically connected to the second end 2 of the photocoupler U3A and the second voltage stabilizing diode Q15A. A resistor R56A and a capacitor C144A are connected in parallel and then grounded. The fourth end 4 of the photocoupler U3A is respectively connected to Figure 4 The boost control circuit 12 and the inverter control circuit 22 are electrically connected.

[0043] Further, combined with Figure 1 , Figure 7 As shown, in this embodiment, the auxiliary power supply module 3 includes a first auxiliary power supply circuit, and the first auxiliary power supply circuit includes a buck converter chip U20A, and the model of the buck converter chip U20A is TPS5410.

[0044] Specifically, the power input terminal VIN of the buck converter chip U20A is used to connect to the first DC power supply 5; the electrical connection between the power input terminal VIN of the buck converter chip U20A and the first DC power supply 5 is also electrically connected to a capacitor C138A and then grounded, and the power input terminal VIN of the buck converter chip U20A is also electrically connected to a capacitor C139A and then grounded. The high-end switch drive terminal BOOT, the high-end switch output terminal PH and the output voltage feedback terminal VSNS of the buck converter chip U20A are respectively connected to Figure 4 The boost control circuit 12 and Figure 5 The boost drive circuit of the buck converter chip U20A is electrically connected; a capacitor C140A is electrically connected between the high-end switch drive terminal BOOT and the high-end switch output terminal PH of the buck converter chip U20A; the high-end switch output terminal PH of the buck converter chip U20A is also electrically connected to the cathode of the diode D53A and then grounded, and the high-end switch output terminal PH of the buck converter chip U20A is also electrically connected to the inductor L4A and then electrically connected to the boost control circuit 12 and the boost drive circuit respectively. The control enable terminal ENA of the buck converter chip U20A is electrically connected to the single-chip microcomputer.

[0045] Further, combined with Figure 1 , Figure 8 , Fig. 9As shown, in this embodiment, the auxiliary power supply module 3 also includes a second auxiliary power supply circuit and a third auxiliary power supply circuit; the second auxiliary power supply circuit includes a flyback conversion chip U16A, and the model of the flyback conversion chip U16A is LT8302.

[0046] Specifically, the power input terminal VIN of the flyback conversion chip U16A is used to access the first DC power supply 5; the electrical connection between the power input terminal VIN of the flyback conversion chip U16A and the first DC power supply 5 is also electrically connected to a capacitor C125A and then grounded. The switch limit terminal SW and the output voltage feedback terminal RFB of the flyback conversion chip U16A are electrically connected to the inverter control circuit 22 respectively; specifically, the switch limit terminal SW of the flyback conversion chip U16A is electrically connected to the diode D48A and the voltage regulator diode D46A and then electrically connected to the input terminal 2 of the transformer T8A, and the switch limit terminal SW of the flyback conversion chip U16A is also electrically connected to the input terminal 4 of the transformer T8A; the output terminals 7 and 8 of the transformer T8A are electrically connected to the diode D44A and then electrically connected to the inverter control circuit 22. The enable terminal EN / UVLO of the flyback conversion chip U16A is electrically connected to the microcontroller.

[0047] The circuit composition of the third auxiliary power circuit is the same as that of the second auxiliary power circuit, and the third auxiliary power circuit is electrically connected to the inverter drive circuit. Fig. 9 , I will not go into details here.

[0048] It can be seen that the utility model discloses an inverter circuit for special communication, including a DC-DC boost module, a DC-AC inverter module and an auxiliary power supply module; the DC-DC boost module includes a boost power circuit and a boost control circuit, and the DC-AC inverter module includes an inverter power circuit and an inverter control circuit; the boost power circuit is electrically connected to the boost control circuit and the inverter power circuit respectively, and the input end of the boost power circuit is used to access the first DC power supply; the inverter power circuit is also electrically connected to the inverter control circuit, and the output end of the inverter power circuit is used to output the target AC power supply; the auxiliary power supply module is electrically connected to the DC-DC boost module and the DC-AC inverter module respectively, and the input end of the auxiliary power supply module is used to access the first DC power supply. The utility model uses the boost power circuit of the DC-DC boost module to boost and rectify the input first DC power supply, and then inputs it into the inverter power circuit in the DC-AC inverter module, performs high-frequency inversion on the boosted first DC power supply, obtains the high-frequency pulse voltage, and then filters the high-frequency pulse voltage, and finally obtains the target AC power supply in the form of a sine wave, thereby realizing the conversion function from DC to AC. The utility model also uses the auxiliary power supply module to provide auxiliary power supply, thereby improving the reliability of power supply; uses the protection circuit to protect the DC-DC boost module and the DC-AC inverter module, thereby improving the overall safety performance of the inverter; and also uses the boost control circuit and the inverter control circuit to feedback control the entire circuit, thereby making the output target AC power supply have stronger dynamic and static characteristics and stronger environmental adaptability.

[0049] The above are only embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. An inverter circuit for special communications, characterized in that: It includes a DC-DC boost module, a DC-AC inverter module and an auxiliary power supply module; the DC-DC boost module includes a boost power circuit and a boost control circuit, and the DC-AC inverter module includes an inverter power circuit and an inverter control circuit; The boost power circuit is electrically connected to the boost control circuit and the inverter power circuit respectively, and the input end of the boost power circuit is used to connect to the first DC power supply; the inverter power circuit is also electrically connected to the inverter control circuit, and the output end of the inverter power circuit is used to output the target AC power supply; the auxiliary power supply module is electrically connected to the DC-DC boost module and the DC-AC inverter module respectively, and the input end of the auxiliary power supply module is used to connect to the first DC power supply.

2. The inverter circuit according to claim 1, characterized in that: The boost power circuit includes a full-bridge soft-switching conversion circuit and a boost transformer; The full-bridge soft switching conversion circuit includes a first bridge arm and a second bridge arm, the first bridge arm includes four first MOS tubes, and the second bridge arm includes four second MOS tubes; the drain of the first MOS tube is used to connect to the first DC power supply, the gate of the first MOS tube is electrically connected to the positive electrode of the first switching diode, and the source of the first MOS tube is electrically connected to the input end of the boost transformer; the drain of the second MOS tube is electrically connected to the input end of the boost transformer, the gate of the second MOS tube is electrically connected to the positive electrode of the second switching diode, and the source of the second MOS tube is grounded.

3. The inverter circuit according to claim 2, characterized in that: The boost power circuit further includes a rectifier circuit, which includes a first rectifier diode, a second rectifier diode, a third rectifier diode, a fourth rectifier diode, a first output capacitor and a second output capacitor; The positive electrode of the first rectifier diode, the positive electrode of the third rectifier diode, the negative electrode of the second rectifier diode and the negative electrode of the fourth rectifier diode are respectively electrically connected to the output end of the boost transformer, the negative electrode of the first rectifier diode and the negative electrode of the third rectifier diode are respectively electrically connected to the positive electrode of the first output capacitor, the positive electrode of the second rectifier diode and the positive electrode of the fourth rectifier diode are respectively electrically connected to the negative electrode of the second output capacitor, and the positive electrode and the negative electrode of the first output capacitor are also respectively electrically connected to the inverter power circuit.

4. The inverter circuit according to claim 1, characterized in that: The boost control circuit includes a boost control chip SG3525; the soft start end of the boost control chip SG3525 is electrically connected to the collector of the boost control transistor, the base of the boost control transistor is electrically connected to the anode of the first voltage regulator diode and then electrically connected to the boost power circuit, and the emitter of the boost control transistor is grounded; the power supply voltage end of the boost control chip SG3525 is electrically connected to the auxiliary power supply module.

5. The inverter circuit according to claim 4, characterized in that: The DC-DC boost module further includes a boost drive circuit, and the boost drive circuit includes a first boost drive circuit and a second boost drive circuit; The first boost drive circuit includes a first boost drive chip UCC27200; the high-end output end, the high-end source connection end and the low-end output end of the first boost drive chip UCC27200 are respectively electrically connected to the boost power circuit; the high-end input end and the low-end input end of the first boost drive chip UCC27200 are respectively electrically connected to the boost control circuit; the power supply end of the first boost drive chip UCC27200 is electrically connected to the auxiliary power supply module; the circuit composition of the second boost drive circuit is the same as the circuit composition of the first boost drive circuit, and the second boost drive circuit is respectively electrically connected to the boost power circuit, the boost control circuit and the auxiliary power supply module.

6. The inverter circuit according to claim 5, characterized in that: The DC-AC inverter module also includes an inverter drive circuit, which is electrically connected to the inverter power circuit, the inverter control circuit and the auxiliary power supply module respectively. The circuit composition of the inverter drive circuit is the same as that of the boost drive circuit; the circuit composition of the inverter control circuit is the same as that of the boost control circuit.

7. The inverter circuit according to claim 1, characterized in that: The inverter power circuit includes a first insulated gate bipolar transistor, a second insulated gate bipolar transistor, a third insulated gate bipolar transistor, a fourth insulated gate bipolar transistor, a filter inductor and a filter capacitor; The emitter of the first insulated gate bipolar transistor and the collector of the third insulated gate bipolar transistor are electrically connected to the first end of the filter inductor, respectively, and the emitter of the second insulated gate bipolar transistor and the collector of the fourth insulated gate bipolar transistor are electrically connected to the third end of the filter inductor, respectively; the collectors of the first insulated gate bipolar transistor and the second insulated gate bipolar transistor are electrically connected to the boost power circuit, respectively, and the emitters of the third insulated gate bipolar transistor and the fourth insulated gate bipolar transistor are electrically connected to the boost power circuit, respectively; the filter inductor is also electrically connected to the filter capacitor, and both ends of the filter capacitor equivalently output the target AC power supply.

8. The inverter circuit according to claim 6, characterized in that: The auxiliary power supply module includes a first auxiliary power supply circuit, and the first auxiliary power supply circuit includes a buck conversion chip TPS5410; The power input end of the buck converter chip TPS5410 is used to connect to the first DC power supply; the high-end switch drive end, the high-end switch output end and the output voltage feedback end of the buck converter chip TPS5410 are electrically connected to the boost control circuit and the boost drive circuit respectively; the control enable end of the buck converter chip TPS5410 is electrically connected to the microcontroller.

9. The inverter circuit according to claim 8, characterized in that: The auxiliary power supply module also includes a second auxiliary power supply circuit and a third auxiliary power supply circuit; The second auxiliary power supply circuit includes a flyback conversion chip LT8302, and the power input terminal of the flyback conversion chip LT8302 is used to connect to the first DC power supply; the switch limit terminal and the output voltage feedback terminal of the flyback conversion chip LT8302 are electrically connected to the inverter control circuit respectively; the enable terminal of the flyback conversion chip LT8302 is electrically connected to the single-chip microcomputer; the circuit composition of the third auxiliary power supply circuit is the same as the circuit composition of the second auxiliary power supply circuit, and the third auxiliary power supply circuit is electrically connected to the inverter drive circuit.

10. The inverter circuit according to claim 9, characterized in that: It also includes a protection circuit; the protection circuit includes a photocoupler and a second zener diode, the first end of the photocoupler is electrically connected to the second auxiliary power supply circuit; the second end of the photocoupler is electrically connected to the cathode of the second zener diode, the anode of the second zener diode is grounded, and the boost power circuit is also electrically connected at the electrical connection between the second end of the photocoupler and the second zener diode; the fourth end of the photocoupler is electrically connected to the boost control circuit and the inverter control circuit respectively.

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