CN114640253B - Hybrid three-level flying capacitor Boost circuit - Google Patents
Hybrid three-level flying capacitor Boost circuit Download PDFInfo
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- CN114640253B CN114640253B CN202210297268.0A CN202210297268A CN114640253B CN 114640253 B CN114640253 B CN 114640253B CN 202210297268 A CN202210297268 A CN 202210297268A CN 114640253 B CN114640253 B CN 114640253B
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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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/00308—Overvoltage protection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention provides a hybrid three-level flying capacitor Boost circuit, which belongs to the technical field of boosting and comprises a bus capacitor voltage division branch circuit and a voltage conversion and voltage equalization circuit, wherein the voltage conversion and voltage equalization circuit comprises: the charging and discharging circuit comprises a voltage stabilizer group and a switching device group which are sequentially connected in series, wherein a charging and discharging branch circuit is connected between a first connecting node of the voltage stabilizer group and a third connecting node of the switching device group; the voltage-sharing branch comprises a first voltage-sharing branch and is connected between a fourth connecting node of the switch device group and a voltage-sharing node of the bus capacitor voltage-sharing branch; the second voltage-sharing branch is connected between a second connecting node of the voltage stabilizer group and the voltage dividing node; and the switch control branch can be connected with the voltage-sharing branch to the positive end of the charging branch in an on-off manner. Has the beneficial effects that: the flying capacitor can be safely charged in a dynamic establishment process when the flying capacitor is charged with voltage, and a switching element and a diode can be effectively protected in the charging process to prevent the flying capacitor from being broken down by overvoltage.
Description
Technical Field
The invention relates to the technical field of boosting, in particular to a hybrid three-level flying capacitor Boost circuit.
Background
The Boost circuit is a switch direct current Boost circuit, can make the output voltage higher than the input voltage, namely realize through this circuit that input a voltage, output a higher voltage, and then realize power conversion. A so-called multi-level Boost circuit capable of inputting three or more levels is generally realized. With the increasing power and voltage grades of the DC-DC converter, under the same input condition, because the multi-level Boost circuit can output higher-grade voltage by using devices with smaller withstand voltage grades, the voltage stress of the power devices is reduced, and the circuit is more and more widely applied in the fields of electric automobiles, rail transit, photovoltaics, wind power and the like.
Compared with the traditional two-level Boost circuit, the multi-level Boost circuit can realize medium-voltage high-power output by using devices with lower cost, and breaks through the limitations of the cost, the volume, the weight and the like. However, the multi-level circuit is more complex than the conventional two-level circuit, and if the flying capacitor voltage of the multi-level Boost circuit is 0, the switching element and the diode need to bear the whole bus voltage, which may cause the switching element and the diode to be broken down by overvoltage, so that the multi-level flying capacitor Boost circuit is more difficult to develop and produce.
Disclosure of Invention
In order to solve the technical problem, the invention provides a hybrid three-level flying capacitor Boost circuit.
The technical problem solved by the invention can be realized by adopting the following technical scheme:
a hybrid three-level flying capacitor Boost circuit comprises a bus capacitor voltage dividing branch circuit connected between a positive output terminal and a negative output terminal, and a voltage conversion and voltage-sharing circuit, wherein the voltage conversion and voltage-sharing circuit comprises:
the voltage regulator group comprises a plurality of diodes which are sequentially connected in series and is connected between the positive output terminal and a first input end;
the switching device group comprises a plurality of switching elements which are sequentially connected in series and is connected between the first input end and the negative output terminal, and a charging and discharging branch circuit is connected between a first connecting node of the voltage stabilizer group and a third connecting node of the switching device group;
the voltage-sharing branch comprises a first voltage-sharing branch and is connected between a fourth connecting node of the switch device group and a voltage-sharing node of the bus capacitor voltage-sharing branch; the second voltage-sharing branch is connected between a second connecting node of the voltage stabilizer group and the voltage dividing node;
and the switch control branch can be connected with the voltage-sharing branch to the positive end of the charge-discharge branch in an on-off manner.
Preferably, the switching device group includes:
a first switching element having a drain connected to the first input terminal and a source connected to the third connection node;
a second switching element having a drain connected to the third connection node and a source connected to the fourth connection node;
a third switching element having a drain connected to the fourth connection node and a source connected to the negative output terminal.
Preferably, the voltage regulator group includes:
a first diode, wherein the anode of the first diode is connected with the first input end, and the cathode of the first diode is connected with the first connecting node;
a second diode having an anode connected to the first connection node and a cathode connected to the second connection node;
and a third diode having an anode connected to the second connection node and a cathode connected to the positive output terminal.
Preferably, the voltage-sharing branch comprises diodes connected in anti-series.
Preferably, the charge and discharge branch includes: a flying capacitor, the flying capacitor having a positive terminal connected to the first connection node and a negative terminal connected to the third connection node.
Preferably, the switch control branch comprises a relay, one end of the relay is connected with the negative end of the voltage-sharing branch, and the other end of the relay is connected with the positive end of the charge-discharge branch.
Preferably, the circuit includes a forward charging process and a reverse charging process, and the third switching element and the third diode are turned off in the forward charging process and the reverse charging process.
Preferably, in the forward charging process, the switch control branch is disconnected;
and in the reverse charging process, the switch controls the branch to be closed.
Preferably, the switching states of the second switching element and the third switching element are the same.
The technical scheme of the invention has the advantages or beneficial effects that:
the flying capacitor can be safely charged in a dynamic establishment process when the flying capacitor is charged, and a switching element and a diode can be effectively protected in the charging process to prevent the switching element and the diode from being broken down by overvoltage.
Drawings
FIG. 1 is a schematic diagram of a hybrid three-level Boost circuit according to a preferred embodiment of the present invention;
FIG. 2 is a schematic diagram illustrating the current flow path during forward charging according to the preferred embodiment of the present invention;
FIG. 3 is a schematic diagram of the current flow path during reverse charging according to the preferred embodiment of the present invention.
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.
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The invention is further described with reference to the following drawings and specific examples, which are not intended to be limiting.
In a preferred embodiment of the present invention, based on the above problems in the prior art, a hybrid three-level flying capacitor Boost circuit is provided, which belongs to the field of boosting technology, and as shown in fig. 1, includes: the Bus capacitor voltage division branch and the voltage conversion and voltage-sharing circuit are connected between a positive output terminal Bus + and a negative output terminal Bus-.
Wherein, bus capacitance voltage division branch road is including the bus capacitance of series connection in proper order, and bus capacitance includes a plurality ofly, and is preferred, and in this embodiment, bus capacitance includes two, first bus capacitance Cbus + and second bus capacitance Cbus-, the voltage division node is located the junction of first bus capacitance Cbus + and second bus capacitance Cbus-.
The voltage conversion and voltage-sharing circuit comprises:
the voltage stabilizer group comprises a plurality of diodes which are sequentially connected in series and connected between a positive output terminal Bus + and a first input end V1;
the switching device group comprises a plurality of switching elements which are sequentially connected in series and connected between the first input end and the negative output terminal Bus-, and a charging and discharging branch is connected between the first connecting node of the voltage stabilizer group and the third connecting node of the switching device group;
the voltage-sharing branch comprises a first voltage-sharing branch and is connected between a fourth connecting node of the switch device group and a voltage-sharing node of the bus capacitor voltage-sharing branch; the second voltage-sharing branch is connected between a second connecting node of the voltage stabilizer group and the voltage dividing node;
and the switch control branch can be connected with the voltage-sharing branch to the positive end of the charge-discharge branch in an on-off manner.
In a voltage conversion and equalization circuit, comprising: a voltage stabilizer group consisting of a plurality of forward series-connected diodes is arranged between the first input end V1 and the positive output terminal Bus +, and a switch device group consisting of a plurality of series-connected switch elements is arranged between the first input end V1 and the negative output terminal Bus-; the voltage stabilizer group at least comprises two connecting nodes, wherein one connecting node is connected with the positive end of the charging and discharging branch, the other connecting node is connected with the voltage-sharing branch, one connecting node of the switch device group is connected with the negative end of the charging and discharging branch, the other connecting node of the switch device group is connected with the voltage-sharing branch, the second voltage-sharing branch is connected with the positive end of the charging and discharging branch in a switching and switching mode through the switch control branch, and the charging and discharging branch takes a flying capacitor as a charging capacitor. Further, the voltage-sharing branch road includes: the positive end of the first voltage-sharing branch circuit is connected with another connecting node of the switch device group, the negative end of the first voltage-sharing branch circuit is connected with the junction of the bus capacitor, the positive end of the second voltage-sharing branch circuit is connected with the junction of the bus capacitor, and the negative end of the second voltage-sharing branch circuit is connected with another connecting node of the voltage stabilizer group.
Further, the circuit of the present invention includes a forward charging process and a reverse charging process, as shown in fig. 2, in the forward charging process, the switch control branch is turned off, and the current flows from the first input terminal V1 to the charging and discharging branch through the diode, and then flows through the switch element, the first voltage-sharing branch, the second Bus capacitor Cbus-to the negative output terminal Bus-; as shown in fig. 3, during the reverse charging process, the switch control branch is closed, and the current is output from the positive output terminal Bus + to the first Bus capacitor Cbus +, passes through the second voltage-sharing branch and the switch control branch to the charging/discharging branch, and then flows to the first input terminal V1 through the switch element. The flying capacitor Cf can be safely charged in the dynamic establishment process when the flying capacitor Cf is at the upper voltage, the voltage at two ends of the flying capacitor Cf is always equal to 0.5 × Vbus, the Vbus is the voltage between a positive output terminal Bus + and a negative output terminal Bus-, and the switching element and the diode can be effectively protected in the forward charging and reverse charging processes to prevent the switching element and the diode from being broken down by overvoltage.
As a preferred embodiment, among others, the switching device group includes:
a first switching element T1, a drain of the first switching element T1 being connected to the first input terminal, a source of the first switching element T1 being connected to the third connection node;
a second switching element T2, a drain of the second switching element T2 being connected to a third connection node which is a source of the first switching element T1, and a source of the second switching element T2 being connected to a fourth connection node;
a third switching element T3, a drain of the third switching element T3 is connected to a fourth connection node which is a source of the second switching element T2, and a source of the third switching element T3 is connected to the negative output terminal Bus-.
Specifically, the switching element according to the embodiment of the present invention includes a plurality of switching elements, and preferably, in this embodiment, the switching element group includes three switching elements in total, that is, a first switching element T1, a second switching element T2, and a third switching element T3, and the first switching element T1, the second switching element T2, and the third switching element T3 are sequentially connected in series, respectively.
Further, each of the switching elements is formed by connecting 1 Insulated Gate Bipolar Transistor (IGBT) and a diode element in parallel, the gates of the edge Gate Bipolar transistors are respectively connected to a Gate control signal for controlling the on/off states of the switching elements, and the switching elements are turned on when the Gate control signal is low level and turned off when the Gate control signal is high level.
As a preferred embodiment, among others, the group of voltage regulators includes:
a first diode D1, wherein the anode of the first diode D1 is connected with the first input end V1, and the cathode of the first diode D1 is connected with the first connecting node;
a second diode D2, an anode of the second diode D2 being connected to a cathode of the first diode D1, i.e., the first connection node, and a cathode of the second diode D2 being connected to the second connection node;
and the anode of the third diode D3 is connected to the cathode of the second diode D2, i.e., the second connection node, and the cathode of the third diode D3 is connected to the positive output terminal Bus +.
Specifically, the diode according to the embodiment of the present invention includes a plurality of diodes, and preferably, in this embodiment, the voltage regulator group includes three diodes in total, that is, a first diode D1, a second diode D2, and a third diode D3, and the first diode D1, the second diode D2, and the third diode D3 are sequentially connected in series in the forward direction.
Further, in the forward charging process and the reverse charging process, the third switching element T3 and the third diode D3 are both in a cut-off state, and after the voltage across the flying capacitor Cf is equal to 0.5 × vbus, that is, the voltage across the flying capacitor Cf is completely established, at this time, the third diode D3 is turned on, the third switching element T3 is also turned on, and the third switching element T3 and the third diode D3 start to operate.
Further, the junction of the first diode D1 and the second diode D2 is connected to the second input terminal V2; the junction of the first switching element T1 and the second switching element T2 is connected to the third input terminal V3.
As a preferred embodiment, wherein the voltage grading branch comprises diodes connected in anti-series.
Further, the diode connected in reverse series includes: a fourth diode Df1 and a fifth diode Df2, wherein the fourth diode Df1 is used as a first voltage-sharing branch, the fifth diode Df2 is used as a second voltage-sharing branch, a positive terminal of the fourth diode Df1 is connected to a junction of the second switching element T2 and the third switching element T3, and a negative terminal of the fourth diode Df1 is connected between a junction of the first bus capacitor Cbus + and the second bus capacitor Cbus-; the positive terminal of the fifth diode Df2 is connected between the junction of the first bus capacitor Cbus + and the second bus capacitor Cbus-, and the negative terminal of the fifth diode Df2 is connected between the junction of the second diode D2 and the third diode D3.
Further, a plurality of the fourth diodes Df1 may be provided, and the plurality of fourth diodes Df1 may be connected in series in the forward direction; the fifth diode Df2 may be provided in plural, and the plural fifth diodes Df2 may be connected in series in the forward direction.
As a preferred embodiment, wherein the charge and discharge branch comprises: and a flying capacitor Cf, a positive terminal of which is connected to a junction of the first diode D1 and the second diode D2, i.e., a first connection node, and a negative terminal of which is connected to a junction of the first switch element T1 and the second switch element T2, i.e., a third connection node.
Preferably, the switch control branch comprises a relay S1, one end of the relay S1 is connected to the negative end of the voltage equalizing branch, and the other end of the relay S1 is connected to the positive end of the charging and discharging branch.
Preferably, during the forward charging process, the switch control branch is disconnected;
and in the reverse charging process, the switch controls the branch to be closed.
In a preferred embodiment, the circuit includes a forward charging process and a reverse charging process, and the third switching element T3 and the third diode D3 are turned off during the forward charging process and the reverse charging process.
In a preferred embodiment, the second switching element T2 and the third switching element T3 have the same switching state.
Specifically, in the present embodiment, the second switching element T2 and the third switching element T3 are turned on and off simultaneously, and if the second switching element T2 is in a conducting state, the third switching element T3 is also turned on; when the second switching element T2 is turned off, the third switching element T3 is also in an off state.
Further, in the circuit according to the embodiment of the present invention, during the forward charging process, as shown in fig. 2, the relay S1 is turned off, and the current flows from the first input terminal V1 → the second diode D1 → the flying capacitor Cf → the second switching element T2 → the fourth diode Df1 → the second Bus capacitor Cbus-, and finally to the negative output terminal Bus-.
During the reverse charging process, as shown in fig. 3, the relay S1 is closed, and the current flows from the positive output terminal Bus + → the first Bus capacitor Cbus + → the fifth diode Df2 → the relay S1 → the flying capacitor Cf → the first switching element T1, and finally to the first input terminal V1.
The invention also provides a hybrid three-level flying capacitor Boost converter which comprises the hybrid three-level flying capacitor Boost circuit.
Adopt above-mentioned technical scheme to have following advantage or beneficial effect: the flying capacitor can be safely charged in a dynamic establishment process when the flying capacitor is charged with voltage, and the switching element T and the diode D can be effectively protected in the charging process to prevent the switching element T and the diode D from being broken down by overvoltage.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention.
Claims (7)
1. A hybrid three-level flying capacitor Boost circuit, comprising a bus capacitor voltage dividing branch connected between a positive output terminal and a negative output terminal, a voltage conversion and voltage equalizing circuit, the voltage conversion and voltage equalizing circuit comprising:
the voltage regulator group comprises a plurality of diodes which are sequentially connected in series and is connected between the positive output terminal and a first input end;
the switching device group comprises a plurality of switching elements which are sequentially connected in series, and is connected between the first input end and the negative output terminal, and a charging and discharging branch circuit is connected between a first connecting node of the voltage stabilizer group and a third connecting node of the switching device group;
the voltage-sharing branch comprises a first voltage-sharing branch and is connected between a fourth connecting node of the switch device group and a voltage-sharing node of the bus capacitor voltage-sharing branch; the second voltage-sharing branch is connected between a second connecting node of the voltage stabilizer group and the voltage dividing node;
the switch control branch can be connected with the voltage-sharing branch in an on-off manner to the positive end of the charge-discharge branch;
the switching device group includes:
a first switching element having a drain connected to the first input terminal and a source connected to the third connection node;
a second switching element having a drain connected to the third connection node and a source connected to the fourth connection node;
a third switching element having a drain connected to the fourth connection node and a source connected to the negative output terminal;
the voltage regulator set includes:
a first diode, wherein the anode of the first diode is connected with the first input end, and the cathode of the first diode is connected with the first connecting node;
a second diode having an anode connected to the first connection node and a cathode connected to the second connection node;
and a third diode having an anode connected to the second connection node and a cathode connected to the positive output terminal.
2. The hybrid three-level flying capacitor Boost circuit of claim 1, wherein the voltage-sharing branch comprises diodes connected in anti-series.
3. The hybrid three-level flying capacitor Boost circuit of claim 2, wherein the charge-discharge branch comprises: a flying capacitor, the flying capacitor having a positive terminal connected to the first connection node and a negative terminal connected to the third connection node.
4. The hybrid three-level flying capacitor Boost circuit according to claim 1, wherein the switch control branch comprises a relay, one end of the relay is connected to the negative terminal of the voltage equalizing branch, and the other end of the relay is connected to the positive terminal of the charging and discharging branch.
5. The hybrid three-level flying capacitor Boost circuit of claim 1, wherein the circuit comprises a forward charging process and a reverse charging process, and the third switching element and the third diode are turned off during the forward charging process and the reverse charging process.
6. The hybrid three-level flying capacitor Boost circuit of claim 5, wherein during the forward charging, the switch control branch is turned off;
and in the reverse charging process, the switch controls the branch to be closed.
7. The hybrid three-level flying capacitor Boost circuit of claim 1, wherein the second switching element and the third switching element are in the same switching state.
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| CN202210297268.0A CN114640253B (en) | 2022-03-24 | 2022-03-24 | Hybrid three-level flying capacitor Boost circuit |
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| CN202210297268.0A CN114640253B (en) | 2022-03-24 | 2022-03-24 | Hybrid three-level flying capacitor Boost circuit |
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