CN114389472A - Constant power inverter with high load - Google Patents
Constant power inverter with high load Download PDFInfo
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- CN114389472A CN114389472A CN202210203624.8A CN202210203624A CN114389472A CN 114389472 A CN114389472 A CN 114389472A CN 202210203624 A CN202210203624 A CN 202210203624A CN 114389472 A CN114389472 A CN 114389472A
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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
-
- 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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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
The utility model provides a constant power inverter with high load, includes busbar current detection circuitry, 380V direct current bus, contravariant H bridge circuit, 220V exchanges output circuit, 220V and exchanges output detection circuitry, single chip microcomputer control circuit, bootstrapping drive circuit and generating line and overflows and catches the circuit, busbar current detection circuitry connects 380V direct current bus, 380V direct current bus connects contravariant H bridge circuit, contravariant H bridge circuit connects 220V and exchanges output circuit and generating line current detection circuit, 220V exchanges output circuit and connects 220V and exchanges output detection circuit, 220V exchanges output detection circuit and connects bootstrapping drive circuit, bootstrapping drive circuit connects contravariant H bridge circuit. The inverter can normally work under the condition of connecting loads which exceed the nominal power by more than one time and various impact loads, and cannot stop working due to over power or overlarge impact current, so that the purchase cost of a user is reduced under the condition of using the same load, and the application environment of a product is increased.
Description
Technical Field
The invention relates to the field of constant power inverters, in particular to a constant power inverter with high load.
Background
The inverter functions of most energy storage products in the market are derived from the traditional inverter, and the traditional inverter circuit technology itself has been relatively mature after years of development, but has the limitation of application scenarios and the limitation of cost. For example, when a nominal 500W inverter is connected to a load larger than 500W, the inverter may stop working due to overpower, and some loads have a lower nominal power but a larger starting power, such as an air conditioner, a refrigerator, and the like. The conventional inverter is connected with the load and basically directly protects, so that a user cannot use the related load. If the user needs the relevant load to work normally, the user has to buy a more powerful inverter, which increases the purchase cost of the user and also limits the sales volume of the inverter product. This limitation of energy storage inverters is urgently needed to be solved.
Disclosure of Invention
The invention aims to overcome the technical defects and provide a constant power inverter with high load, and the patent takes a 500W energy storage inverter as an example and provides a control mode for increasing the working scene of the inverter under a mode compatible with the function of a conventional inverter, so that the inverter can normally work under the condition of connecting loads more than one time higher than the nominal power and various impact loads, and the inverter can not stop working due to over power or over impact current, thereby reducing the purchase cost of a user under the condition of using the same load and increasing the application environment of a product.
In order to solve the problems, the technical scheme of the invention is as follows: the utility model provides a constant power inverter with high load, includes busbar current detection circuitry, 380V direct current bus, contravariant H bridge circuit, 220V exchanges output circuit, 220V and exchanges output detection circuitry, single chip microcomputer control circuit, bootstrapping drive circuit and generating line and overflows and catches the circuit, busbar current detection circuitry connects 380V direct current bus, 380V direct current bus connects contravariant H bridge circuit, contravariant H bridge circuit connects 220V and exchanges output circuit and generating line current detection circuit, 220V exchanges output circuit and connects 220V and exchanges output detection circuitry, 220V exchanges output detection circuitry and connects bootstrapping drive circuit, bootstrapping drive circuit connects contravariant H bridge circuit, generating line current detection circuitry connects the generating line and overflows and catches the circuit, the generating line overflows and catches the circuit and connect single chip microcomputer control circuit.
Furthermore, GNDN and BUS + in the inverter H bridge circuit are both 380V buses, R1 is a BUS current detection resistor, Q1, Q2, Q3 and Q4 are 4 switching tubes of the inverter H bridge, and G1 and G2 are output ends.
Further, OUTL and OUTN in the 220V AC output circuit are connected with load.
Further, the OUTL and OUTN signals in the 220V AC output detection circuit are differentially amplified through a U5 operational amplifier and then sent to the single chip microcomputer as output voltage detection signals, and the single chip microcomputer stabilizes the output AC voltage at 220V through the signals.
Further, in the single chip microcomputer control circuit, the PWM1L, the PWM1H, the PWM2L and the PWM2H are control signals of 4 MOS tubes of an inverter H bridge, the VFB is an output alternating voltage feedback signal, the BKIN is a bus current overcurrent capturing signal, and the rest are auxiliary control signals.
Further, in the bootstrap drive circuit, PWM1L, PWM1H, PWM2L, and PWM2H are control signals sent by a single chip microcomputer, SPWM1L, SPWM1H, SPWM2L, and SPWM2H are signals after passing through the bootstrap drive chip, and the signals are directly connected to drive pins of the MOS transistor, -7V1,12V1, -7V2,12V2, -7V3, and 12V3, which are 3 groups of isolated positive and negative power supplies.
Further, R1 in the bus overcurrent catching circuit is a bus current detection resistor, a BKIN signal is a bus current overcurrent catching signal, signal voltages at two ends of R1 are amplified through U2 operational amplifier, when the voltage of the 4 th pin of U2 is larger than 0.7V, Q5 starts to be conducted, the BKIN signal is pulled down, and if the BKIN signal is continuously pulled down, the single chip microcomputer judges that the load is overcurrent.
Compared with the prior art, the invention has the advantages that: this patent is according to the mode adjustment output voltage that detects the busbar current and overflow for alternating current output power is invariable, and the output is no longer connected many powerful loads, and the maximum operating power of load is restricted at constant power value, when connecing impact load or load power and being greater than when setting for constant power like this, all can make the load not cut off the power supply, as long as the load can start, just can make load work at constant power value, promotes the range of application of dc-to-ac converter greatly.
Drawings
Fig. 1 is a schematic diagram of the present invention.
Fig. 2 is a circuit diagram of an inverter H-bridge.
Fig. 3 is a circuit diagram of 220V ac output.
Fig. 4 is a circuit diagram of a 220V ac output detection circuit.
Fig. 5 is a circuit diagram of the single chip microcomputer control.
Fig. 6 is a bootstrap drive circuit diagram.
Fig. 7 is a bus overcurrent catching circuit diagram.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments; all other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in FIG. 1, a constant power inverter with high load comprises a bus current detection circuit, a 380V DC bus, an inverter H-bridge circuit, a 220V AC output detection circuit, a single chip control circuit, a bootstrap drive circuit and a bus overcurrent capture circuit, the bus current detection circuit is connected with a 380V direct current bus, the 380V direct current bus is connected with an inverter H bridge circuit, the inverter H bridge circuit is connected with a 220V alternating current output circuit and a bus current detection circuit, the 220V alternating current output circuit is connected with a 220V alternating current output detection circuit, the 220V alternating current output detection circuit is connected with a bootstrap drive circuit, the bootstrap drive circuit is connected with an inverter H-bridge circuit, the bus current detection circuit is connected with a bus overcurrent capturing circuit, and the bus overcurrent capturing circuit is connected with the single chip microcomputer control circuit.
As shown in fig. 2, GNDN and BUS + in the inverter H-bridge circuit are both 380V buses, R1 is a BUS current detection resistor, Q1, Q2, Q3, Q4 are 4 switching tubes of the inverter H-bridge, and G1 and G2 are output ends.
As shown in FIG. 3, OUTL and OUTN in the 220V AC output circuit are connected to the load.
As shown in fig. 4, the OUTL and OUTN signals in the 220V ac output detection circuit are differentially amplified by the U5 operational amplifier and then sent to the single chip microcomputer as an output voltage detection signal, and the single chip microcomputer stabilizes the output ac voltage at 220V by the output voltage detection signal.
As shown in fig. 5, in the single chip microcomputer control circuit, PWM1L, PWM1H, PWM2L and PWM2H are control signals of 4 MOS transistors of an inverter H-bridge, VFB is an output ac voltage feedback signal, BKIN is a bus current overcurrent capture signal, and the rest are auxiliary control signals.
As shown in fig. 6, in the bootstrap driving circuit, PWM1L, PWM1H, PWM2L, and PWM2H are control signals sent by a single chip, SPWM1L, SPWM1H, SPWM2L, and SPWM2H are signals after passing through the bootstrap driving chip, and the signals are directly connected to driving pins of the MOS transistor, -7V1,12V1, -7V2,12V2, -7V3, and 12V3, which are 3 groups of isolated positive and negative power supplies.
As shown in fig. 7, in the bus overcurrent catching circuit, R1 is a bus current detection resistor, a BKIN signal is a bus current overcurrent catching signal, signal voltages at two ends of R1 are amplified by a U2 operational amplifier, when the voltage of the 4 th pin of U2 is greater than 0.7V, Q5 starts to be turned on, the BKIN signal is pulled down, and if the BKIN signal is continuously pulled down, the single chip microcomputer judges that the load is overcurrent.
In specific use, after a bus is electrified, the single chip microcomputer sends 4 paths of PWM signals, and the 4 paths of PWM signals drive 4 MOS (metal oxide semiconductor) tubes of an inverter H bridge through a bootstrap circuit, so that alternating-current voltage is generated at alternating-current output. The single chip microcomputer outputs stable 220V alternating current by detecting VFB signals, and starting is completed. Then the singlechip detects the BKIN signal, when the BKIN signal is in a high level, the load is not overloaded, when the BKIN signal is continuously detected to be in a low level, the load is overloaded, at the moment, the singlechip reduces the output voltage from 220V alternating current step by step (the minimum can be reduced to 0V alternating current) by adjusting the PWM signal. Until the BKIN signal is at a high level, the single chip microcomputer gradually increases the output voltage by controlling the 4 paths of PWM signals, if the BKIN signal is changed to a low level again in the increasing process, the load is overloaded, the single chip microcomputer gradually decreases the output voltage, and the process is circulated until the load is not overloaded and the output is stabilized at 220V.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
The present invention and its embodiments have been described above, and the description is not intended to be limiting, and the drawings are only one embodiment of the present invention, and the actual structure is not limited thereto. In summary, those skilled in the art should appreciate that they can readily use the disclosed conception and specific embodiments as a basis for designing or modifying other structures for carrying out the same purposes of the present invention without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (7)
1. A constant power inverter with high load, characterized by: including bus current detection circuit, 380V direct current bus, contravariant H bridge circuit, 220V exchange output detection circuitry, single chip microcomputer control circuit, bootstrapping drive circuit and generating line and overflow the catching circuit, bus current detection circuit connection 380V direct current bus, 380V direct current bus connection contravariant H bridge circuit, 220V exchanges output circuitry and generating line current detection circuit, 220V exchanges output detection circuitry and connects 220V and exchanges output detection circuitry, 220V exchanges output detection circuitry and connects bootstrapping drive circuit, bootstrapping drive circuit connection contravariant H bridge circuit, generating line current detection circuit connection generating line overflows the catching circuit, generating line overflows the catching circuit and connects single chip microcomputer control circuit.
2. A constant power inverter with high load according to claim 1, wherein: GNDN and BUS + in the inverter H bridge circuit are 380V buses, R1 is a BUS current detection resistor, Q1, Q2, Q3 and Q4 are 4 switching tubes of the inverter H bridge, and G1 and G2 are output ends.
3. A constant power inverter with high load according to claim 1, wherein: OUTL and OUTN in the 220V AC output circuit are connected with load.
4. A constant power inverter with high load according to claim 1, wherein: OUTL and OUTN signals in the 220V alternating current output detection circuit are subjected to differential amplification through a U5 operational amplifier and then are sent to the single chip microcomputer as output voltage detection signals, and the single chip microcomputer stabilizes output alternating current voltage at 220V through the signals.
5. A constant power inverter with high load according to claim 1, wherein: PWM1L, PWM1H, PWM2L and PWM2H in the singlechip control circuit are 4 MOS tube control signals of an inverter H bridge, VFB is an output alternating voltage feedback signal, BKIN is a bus current overcurrent capturing signal, and the rest are auxiliary control signals.
6. A constant power inverter with high load according to claim 1, wherein: in the bootstrap drive circuit, the PWM1L, PWM1H, PWM2L and PWM2H are control signals sent by a single chip microcomputer, the SPWM1L, SPWM1H, SPWM2L and SPWM2H are signals passing through a bootstrap drive chip, and the signals are directly connected to drive pins of the MOS transistor, and the signals are 3 groups of isolated positive and negative power supplies, namely, -7V1,12V1, -7V2,12V2, -7V3 and 12V 3.
7. A constant power inverter with high load according to claim 1, wherein: r1 is bus current detection resistance among the bus overcurrent catching circuit, and the BKIN signal is bus current overcurrent catching signal, and the signal voltage at both ends of R1 is amplified through U2 operational amplifier, and when U2 4 th foot voltage is greater than 0.7V, Q5 begins to switch on, and the BKIN signal is pulled down, if the BKIN signal is continuously pulled down, the singlechip is judged as load overcurrent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210203624.8A CN114389472A (en) | 2022-03-03 | 2022-03-03 | Constant power inverter with high load |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210203624.8A CN114389472A (en) | 2022-03-03 | 2022-03-03 | Constant power inverter with high load |
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| Publication Number | Publication Date |
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| CN114389472A true CN114389472A (en) | 2022-04-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210203624.8A Pending CN114389472A (en) | 2022-03-03 | 2022-03-03 | Constant power inverter with high load |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115603430A (en) * | 2022-11-16 | 2023-01-13 | 浙江动一新能源动力科技股份有限公司（Cn） | Portable electric energy storage system and power adjusting method thereof |
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2022
- 2022-03-03 CN CN202210203624.8A patent/CN114389472A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115603430A (en) * | 2022-11-16 | 2023-01-13 | 浙江动一新能源动力科技股份有限公司（Cn） | Portable electric energy storage system and power adjusting method thereof |
| US11973416B1 (en) | 2022-11-16 | 2024-04-30 | Zhejiang Lera New Energy Power Technology Co., Ltd | Adaptive load-responsive portable electric energy storage system and power regulation method thereof |
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