CN112821761A - Flying capacitor three-level boost circuit - Google Patents
Flying capacitor three-level boost circuit Download PDFInfo
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- CN112821761A CN112821761A CN202110148753.7A CN202110148753A CN112821761A CN 112821761 A CN112821761 A CN 112821761A CN 202110148753 A CN202110148753 A CN 202110148753A CN 112821761 A CN112821761 A CN 112821761A
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- switch tube
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- 239000003990 capacitor Substances 0.000 title claims abstract description 54
- 230000000087 stabilizing effect Effects 0.000 abstract description 2
- 238000000034 method Methods 0.000 abstract 1
- 238000005070 sampling Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 11
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
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Classifications
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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
- H02M3/00—Conversion of DC power input into DC power output
- H02M3/02—Conversion of DC power input into DC power output without intermediate conversion into AC
- H02M3/04—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters
- H02M3/10—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of DC power input into DC power output without intermediate conversion into AC 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
- H02M3/155—Conversion of DC power input into DC power output without intermediate conversion into AC 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
- H02M3/156—Conversion of DC power input into DC power output without intermediate conversion into AC 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 with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion of DC power input into DC power output without intermediate conversion into AC 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 with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
-
- 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)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a flying capacitor three-level boost circuit which comprises a diode D1, an inductor L1, a capacitor Cfly, a diode D2, a capacitor power switch tube T1 and a power switch tube T2, wherein the anode of the diode D1 is connected with the drain electrodes of the inductor L and the power switch tube T1, the other end of the inductor L is connected with the anode of a power supply Vin, the source electrode of the power switch tube T1 is connected with the cathode of the source electrode of the power switch tube T2, the cathode of the diode ZD1 and the capacitor Cfly, and the other end of the capacitor Cfly is connected with the cathode of the diode D1, the diode D4 and the anode of the diode D2. The invention detects the current sampling open-circuit fault by a software control method under the condition of not influencing the normal operation of a machine. The flying capacitor three-level boost circuit can solve the problems that the tube voltage of the boost three-level circuit is too high and the reverse voltage of the diode D2 is too high by connecting the voltage stabilizing diodes in series.
Description
Technical Field
The invention relates to the technical field of electricity, in particular to a flying capacitor three-level boost circuit.
Background
The Boost circuit is a Boost conversion circuit, can make the output voltage higher than the input voltage, and is commonly used in direct current motor drive, single-phase power factor correction and photovoltaic inverter direct current side part. Boost circuits are divided into two-level circuits and multi-level circuits, the two-level circuits are mainly used in the case of low voltage level, and the multi-level Boost circuits are mainly used in the case of high voltage level, wherein the three-level circuits are the most common. For the same output voltage grade, the voltage stress of the three-level circuit power switch device is half of that of the common two-level circuit when the three-level circuit power switch device works normally, so that the high-voltage high-power output can be realized by using the power switch device with low voltage withstanding grade.
The analysis is performed below taking a three-level boost as an example. Fig. 1 shows a conventional flying capacitor three-level boost circuit, which is characterized in that at the initial power-on moment, since the flying capacitor voltage is 0 and the voltage across T2 is the whole input voltage, generally, the voltage withstand class of a three-level boost switch tube is selected according to half of the bus voltage, and when the input voltage is greater than half of the bus, there is a risk of overvoltage damage to T2, which is problem 1. When one of the boost three levels normally works, the bus is already raised to a normal voltage level, and if the other one of the boost three levels does not work because of low input voltage or no light voltage panel, the initial voltage of the flying capacitor of the one path is 0, the voltage of the negative terminal of the flying capacitor is close to 0 because the power switch tubes T1 and T2 are disconnected, so that the reverse voltage borne by the two ends of the diode D2 is the voltage of the whole bus, which may cause overvoltage breakdown of the diode D2, which is problem 2.
Disclosure of Invention
The present invention is directed to a flying capacitor three-level boost circuit to solve the above problems.
In order to achieve the purpose, the invention provides the following technical scheme:
a flying capacitor three-level boost circuit comprises a diode D1, an inductor L1, a capacitor Cfly, a diode D2, a capacitor power switch tube T1 and a power switch tube T2, wherein the anode of the diode D1 is connected with the inductor L and the drain of the power switch tube T1, the other end of the inductor L is connected with the anode of a power Vin, the source of the power switch tube T1 is connected with the cathode of the source of the power switch tube T2, the cathode of the diode ZD1 and the capacitor Cfly, the other end of the capacitor Cfly is connected with the cathode of the diode D1, the anode of the diode D4 and the anode of the diode D2, the cathode of the diode D2 is connected with a capacitor Cbus + and a resistor R, the other end of the resistor R is connected with the drain of the capacitor Cbus-, the drain of the power switch tube T2 and the cathode of the power Vin, the anode of the diode ZD 7378 is connected with the anode of the diode D6866, the anode of the diode D3 is connected with the anode of the diode ZD, The other terminal of capacitor Cbus +, the cathode of diode D3 and the cathode of diode ZD 2.
As a further technical scheme of the invention: the diode ZD1 is a zener diode.
As a further technical scheme of the invention: the diode ZD2 is a zener diode.
As a further technical scheme of the invention: the diode D3 is a rectifier diode.
As a further technical scheme of the invention: the diode D4 is a rectifier diode.
As a further technical scheme of the invention: the power switch tube T1 is a MOS tube.
As a further technical scheme of the invention: the power switch tube T2 is a MOS tube.
Compared with the prior art, the invention has the beneficial effects that: the flying capacitor three-level boost circuit can solve the problems that the tube voltage of the boost three-level circuit is too high and the reverse voltage of the diode D2 is too high by connecting the voltage stabilizing diodes in series.
Drawings
Fig. 1 is a diagram of a conventional flying capacitor three-level boost circuit.
FIG. 2 is a schematic diagram of a flying capacitor three-level boost circuit of the present invention.
Fig. 3 is a graph of D <0.5, the drive waveform and inductor current waveform for a power switch.
FIG. 4 is a diagram of a switching section inductor current loop with D <0.5 and a current path Vin + → L → T1 → Cfly → D2 → Cbus + → Cbus- → Vin-.
FIG. 5 is a diagram of a switched-section inductor current loop with D <0.5 and a current path Vin + → L → D1 → D2 → Cbus + → Cbus- → Vin-.
FIG. 6 is a diagram of a current loop of a switch section inductor with a current path of Vin + → L → D1 → Cfly → T2 → Vin-and a current path of Vin < 0.5.
FIG. 7 is a diagram of a switched-section inductor current loop with D <0.5 and a current path Vin + → L → D1 → D2 → Cbus + → Cbus- → Vin-.
Fig. 8 is a diagram of D >0.5, drive waveforms and inductor current waveforms for a power switch.
FIG. 9 is a diagram of a switch-section inductor current loop with D >0.5 and a current path Vin + → L → T1 → T2 → Vin-.
FIG. 10 is a diagram of a switching section inductor current loop with D >0.5 and a current path Vin + → L → T1 → Cfly → D2 → Cbus + → Cbus- → Vin-.
FIG. 11 is a diagram of a switch-section inductor current loop with D >0.5 and a current path Vin + → L → T1 → T2 → Vin-.
FIG. 12 is a diagram of a current loop of a switch section inductor with a current path of Vin + → L → D1 → Cfly → T2 → Vin-.
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.
Referring to fig. 1-12, example 1: a flying capacitor three-level boost circuit comprises a diode D1, an inductor L1, a capacitor Cfly, a diode D2, a capacitor power switch tube T1 and a power switch tube T2, wherein the anode of the diode D1 is connected with the inductor L and the drain of the power switch tube T1, the other end of the inductor L is connected with the anode of a power Vin, the source of the power switch tube T1 is connected with the cathode of the source of the power switch tube T2, the cathode of the diode ZD1 and the capacitor Cfly, the other end of the capacitor Cfly is connected with the cathode of the diode D1, the anode of the diode D4 and the anode of the diode D2, the cathode of the diode D2 is connected with a capacitor Cbus + and a resistor R, the other end of the resistor R is connected with the drain of the capacitor Cbus-, the drain of the power switch tube T2 and the cathode of the power Vin, the anode of the diode ZD 7378 is connected with the anode of the diode D6866, the anode of the diode D3 is connected with the anode of the diode ZD, The other terminal of capacitor Cbus +, the cathode of diode D3 and the cathode of diode ZD 2.
For problem 1, a diode D3 can be connected in series between the flying capacitor negative terminal and the bus midpoint, and the flying capacitor negative terminal voltage is clamped at the lower half bus voltage, so that the voltage across the switch tube T2 is clamped at 0.5 bus voltage. In actual work, flying capacitor voltage has some fluctuation, the diode D3 has overheating phenomenon because current frequently flows, and the voltage regulator tube ZD1 and the diode D3 can be connected in series, so that the diode can work only when the voltage regulator tube is operated by flying capacitor voltage fluctuation to stabilize voltage, the power loss of the diode D3 is effectively reduced, and the power efficiency is improved.
The problem 2 is also solved by connecting a diode D4 in series between the flying capacitor positive terminal and the bus midpoint, so that the flying capacitor positive terminal voltage is clamped at the lower half bus voltage in the initial stage, and the maximum reverse voltage borne by the diode D2 is 0.5 bus voltage. Also, to prevent the diode D4 from flowing current frequently, the zener diode ZD2 is connected in series with it.
The flying capacitor voltage is required to be controlled to be stabilized above the half bus voltage by Vcfly = 0.5 Vbus + bias voltage, namely Vcfly >0.5 Vbus, and the phases of the switching tubes T1 and T2 are 180 degrees different. The circuit operation states are divided into two types D <0.5 and D >0.5, as shown in FIGS. 4-7 and 9-12 respectively
Example 2, the diode ZD1 is a zener diode based on example 1. Diode ZD2 is a zener diode. The diode D3 is a rectifier diode. The diode D4 is a rectifier diode. The power switch transistor T1 is a MOS transistor. The power switch transistor T2 is a MOS transistor.
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 attributes 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 description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (7)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110148753.7A CN112821761A (en) | 2021-02-03 | 2021-02-03 | Flying capacitor three-level boost circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110148753.7A CN112821761A (en) | 2021-02-03 | 2021-02-03 | Flying capacitor three-level boost circuit |
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| Publication Number | Publication Date |
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| CN112821761A true CN112821761A (en) | 2021-05-18 |
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| CN202110148753.7A Pending CN112821761A (en) | 2021-02-03 | 2021-02-03 | Flying capacitor three-level boost circuit |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113890327A (en) * | 2021-10-15 | 2022-01-04 | 中山大学 | Boost circuit and control method integrating APFC and switched capacitor converter |
| CN114421761A (en) * | 2022-03-30 | 2022-04-29 | 阳光电源股份有限公司 | Three-level converter with flying capacitor and control method |
| CN114640253A (en) * | 2022-03-24 | 2022-06-17 | 苏州罗约科技有限公司 | Hybrid three-level flying capacitor Boost circuit |
| WO2024174369A1 (en) * | 2023-02-23 | 2024-08-29 | 上能电气股份有限公司 | Boost circuit structure, inversion device, and photovoltaic power generation system |
| CN118962373A (en) * | 2024-09-04 | 2024-11-15 | 浙江日风电气股份有限公司 | A voltage stress test circuit and test method for a three-level boost circuit |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109756115A (en) * | 2018-12-21 | 2019-05-14 | 华为数字技术（苏州）有限公司 | A boost power conversion circuit, method, inverter, device and system |
| CN110677027A (en) * | 2019-09-26 | 2020-01-10 | 特变电工新疆新能源股份有限公司 | Clamping type boosting power conversion circuit |
| CN215186465U (en) * | 2021-02-03 | 2021-12-14 | 浙江日风电气股份有限公司 | Flying capacitor three-level boost circuit |
-
2021
- 2021-02-03 CN CN202110148753.7A patent/CN112821761A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109756115A (en) * | 2018-12-21 | 2019-05-14 | 华为数字技术（苏州）有限公司 | A boost power conversion circuit, method, inverter, device and system |
| CN110677027A (en) * | 2019-09-26 | 2020-01-10 | 特变电工新疆新能源股份有限公司 | Clamping type boosting power conversion circuit |
| CN215186465U (en) * | 2021-02-03 | 2021-12-14 | 浙江日风电气股份有限公司 | Flying capacitor three-level boost circuit |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113890327A (en) * | 2021-10-15 | 2022-01-04 | 中山大学 | Boost circuit and control method integrating APFC and switched capacitor converter |
| WO2023060724A1 (en) * | 2021-10-15 | 2023-04-20 | 中山大学 | Boosting circuit integrating apfc and switched capacitor converter, and control method |
| CN114640253A (en) * | 2022-03-24 | 2022-06-17 | 苏州罗约科技有限公司 | Hybrid three-level flying capacitor Boost circuit |
| CN114640253B (en) * | 2022-03-24 | 2023-03-14 | 苏州罗约科技有限公司 | Hybrid three-level flying capacitor Boost circuit |
| CN114421761A (en) * | 2022-03-30 | 2022-04-29 | 阳光电源股份有限公司 | Three-level converter with flying capacitor and control method |
| WO2024174369A1 (en) * | 2023-02-23 | 2024-08-29 | 上能电气股份有限公司 | Boost circuit structure, inversion device, and photovoltaic power generation system |
| EP4459856A4 (en) * | 2023-02-23 | 2025-03-05 | Sineng Electric Co., Ltd. | AMPLIFICATION CIRCUIT STRUCTURE, INVERSION DEVICE AND PHOTOVOLTAIC POWER GENERATION SYSTEM |
| CN118962373A (en) * | 2024-09-04 | 2024-11-15 | 浙江日风电气股份有限公司 | A voltage stress test circuit and test method for a three-level boost circuit |
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