CN116111844A - Dual-switch converter and control method thereof - Google Patents
Dual-switch converter and control method thereof Download PDFInfo
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- CN116111844A CN116111844A CN202310394245.6A CN202310394245A CN116111844A CN 116111844 A CN116111844 A CN 116111844A CN 202310394245 A CN202310394245 A CN 202310394245A CN 116111844 A CN116111844 A CN 116111844A
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- 239000003990 capacitor Substances 0.000 claims description 92
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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
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
- H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
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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
- H02M3/1566—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 with means for compensating against rapid load changes, e.g. with auxiliary current source, with dual mode control or with inductance variation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention relates to a double-switch converter and a control method thereof, wherein the double-switch converter comprises a power supply, a first boosting unit, a second boosting unit, a third boosting unit, a first switching tube, a second switching tube and an output unit; the first end of the first boosting unit is connected with the positive electrode of the power supply, the second end of the first boosting unit is connected with the first end of the first switching tube, and the second end of the first switching tube is connected with the negative electrode of the power supply; the first end of the second boosting unit is connected with the negative electrode of the power supply, the second end of the second boosting unit is connected with the second end of the second switching tube and the output unit, and the first end of the second switching tube is connected with the positive electrode of the power supply; the first end of the third boosting unit is connected with the first end of the first switching tube, and the second end of the third boosting unit is connected with the output unit; the first boosting unit, the second boosting unit and the third boosting unit are respectively used for supplying power to the output unit, so that the converter obtains larger voltage gain under a proper duty ratio.
Description
Technical Field
The invention relates to the technical field of converters, in particular to a double-switch converter and a control method thereof.
Background
The input current of the Boost converter is continuous, the structure is simple, the direct current Boost converter which is most widely applied at present is adopted, and a plurality of direct current Boost converters are derived on the basis, but the actual voltage gain of the Boost converter is influenced by parasitic parameters of a circuit, a certain upper limit exists, and the duty ratio is required to be improved to realize larger gain, so that the current stress and the voltage stress of the power tube are larger.
Disclosure of Invention
Aiming at the problems in the prior art, the double-switch converter and the control method thereof are provided, so that the converter obtains larger voltage gain under proper duty ratio.
In a first aspect, an embodiment of the present application provides a dual-switch converter, where the converter includes a power supply, a first boost unit, a second boost unit, a third boost unit, a first switch tube, a second switch tube, and an output unit;
the first end of the first boosting unit is connected with the positive electrode of the power supply, the second end of the first boosting unit is connected with the first end of the first switching tube, and the second end of the first switching tube is connected with the negative electrode of the power supply;
the first end of the second boosting unit is connected with the negative electrode of the power supply, the second end of the second boosting unit is connected with the second end of the second switching tube and the output unit, and the first end of the second switching tube is connected with the positive electrode of the power supply;
the first end of the third boost unit is connected with the first end of the first switch tube and the second end of the first boost unit, and the second end of the third boost unit is connected with the output unit;
the first boosting unit, the second boosting unit and the third boosting unit are respectively used for supplying power to the output unit.
Preferably, the third boost unit includes a first capacitor, a second capacitor, a first diode, a second diode and a third inductor;
the first end of the first capacitor is connected with the first end of the third inductor and the anode of the second diode, the cathode of the second diode is connected with the first end of the second capacitor, the second end of the second capacitor is connected with the second end of the third inductor and the cathode of the first diode, and the anode of the first diode is connected with the second end of the first capacitor;
the second end of the first capacitor is the first end of the third boost unit, and the cathode of the second diode is the second end of the third boost unit.
Preferably, the first boost unit includes a first inductor, a first end of the first inductor is a first end of the first boost unit, and a second end of the first inductor is a second end of the first boost unit.
Preferably, the second boost unit includes a second inductor, a first end of the second inductor is a first end of the second boost unit, and a second end of the second inductor is a second end of the second boost unit.
Preferably, the output unit comprises a third capacitor, a first end of the third capacitor is connected with a second end of the third boost unit, and a second end of the third capacitor is connected with a second end of the second boost unit; the load is connected in parallel to two ends of the third capacitor.
Preferably, the first switch tube is a field effect tube, the first end of the first switch tube is a drain electrode of the field effect tube, the second end of the first switch tube is a source electrode of the field effect tube, and the third end of the first switch tube is a grid electrode of the field effect tube;
the second switching tube is a field effect tube, the first end of the second switching tube is a drain electrode of the field effect tube, the second end of the second switching tube is a source electrode of the field effect tube, and the third end of the second switching tube is a grid electrode of the field effect tube.
Preferably, the gain ratio of the input voltage to the output voltage of the dual-switch converter is
Wherein M is the gain ratio of the input voltage and the output voltage of the double-switch converter, D is the on duty ratio of the first switch tube, and the on duty ratio of the second switch tube is the same as the on duty ratio of the first switch tube.
In a second aspect, an embodiment of the present application provides a control method of a dual-switch converter, where the method includes: the method comprises the following steps:
in one switching period, the first switching tube and the second switching tube are controlled to be simultaneously turned on, and after the first period of time is continued, the first switching tube and the second switching tube are controlled to be simultaneously turned off, and the second period of time is continued, so that the converter alternately works in two working modes.
Preferably, the two working modes are a first working mode and a second working mode respectively;
first working mode: the first switch tube and the second switch tube are conducted, the first diode and the second diode are cut off, and the power supply charges the first inductor, the second inductor, the third inductor, the first capacitor and the second capacitor; the third capacitor provides energy for the load;
second mode of operation: the first switch tube and the second switch tube are turned off, the first diode and the second diode are turned on, and the power supply, the first inductor, the second inductor, the third inductor, the first capacitor and the second capacitor provide energy for the load and the third capacitor.
One of the above technical solutions has the following beneficial effects: the converter provided by the embodiment can obtain larger voltage gain under the proper duty ratio, and the proper duty ratio avoids the first switching tube and the second switching tube from bearing larger voltage stress, thereby ensuring the transmission efficiency of the converter.
Drawings
The invention will now be described in further detail with reference to the drawings and to specific embodiments.
Fig. 1 is a schematic diagram of a topology structure of a dual-switch converter according to the present invention.
Fig. 2 is a circuit diagram of a dual-switch converter according to the present invention in a first operation mode.
Fig. 3 is a circuit diagram of a dual-switch converter according to the present invention in a second operation mode.
Fig. 4 is a main operation waveform diagram of a dual-switch converter provided in the present invention in one switching cycle.
Reference numerals: l1, a first inductor; l2, a second inductor; l3, a third inductor; c1, a first capacitor; c2, a second capacitor; c3, a third capacitor; d1, a first diode; d2, a second diode; s1, a first switching tube; s2, a second switching tube; VIN, power supply; r, load.
Detailed Description
The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
The embodiment of the application provides a dual-switch converter and a control method thereof, and particularly relates to a dual-switch converter, referring to fig. 1, comprising a first boost unit, a second boost unit, a third boost unit, a first switch tube S1, a second switch tube S2 and an output unit.
The first boost unit comprises a first inductor L1, the first end of the first inductor L1 is the first end of the first boost unit, and the second end of the first inductor L1 is the second end of the first boost unit; when the converter is used, the first end of the first boost unit is connected with the positive electrode of the power supply VIN, the second end of the first boost unit is connected with the first end of the first switch tube S1, and the second end of the first switch tube S1 is connected with the negative electrode of the power supply VIN.
The second boost unit comprises a second inductor L2, the first end of the second inductor L2 is the first end of the second boost unit, and the second end of the second inductor L2 is the second end of the second boost unit; the first end of the second boost unit is connected with the negative pole of the power supply VIN, the second end of the second boost unit is connected with the second end of the second switch tube S2 and the output unit, and the first end of the second switch tube S2 is connected with the positive pole of the power supply VIN.
The third boosting unit comprises a first capacitor C1, a second capacitor C2, a first diode D1, a second diode D2 and a third inductor L3; the first end of the first capacitor C1 is connected with the first end of the third inductor L3 and the anode of the second diode D2, the cathode of the second diode D2 is connected with the first end of the second capacitor C2, the second end of the second capacitor C2 is connected with the second end of the third inductor L3 and the cathode of the first diode D1, and the anode of the first diode D1 is connected with the second end of the first capacitor C1. The second end of the first capacitor C1 is the first end of the third boost unit, and the cathode of the second diode D2 is the second end of the third boost unit; the first end of the third boost unit is connected with the first end of the first switch tube S1, and the second end of the third boost unit is connected with the output unit.
The first boosting unit, the second boosting unit and the third boosting unit are respectively used for supplying power to the output unit.
The output unit comprises a third capacitor C3, a first end of the third capacitor C3 is connected with a second end of the third boosting unit, and a second end of the third capacitor C3 is connected with a second end of the second boosting unit; the load R is connected in parallel to two ends of the third capacitor C3.
The first switch tube S1 is a field effect tube, the first end of the first switch tube S1 is a drain electrode of the field effect tube, the second end of the first switch tube S1 is a source electrode of the field effect tube, and the third end of the first switch tube S1 is a grid electrode of the field effect tube.
The second switching tube S2 is a field effect tube, the first end of the second switching tube S2 is a drain electrode of the field effect tube, the second end of the second switching tube S2 is a source electrode of the field effect tube, and the third end of the second switching tube S2 is a grid electrode of the field effect tube.
In this embodiment, each capacitor C1, C2, C3 may be configured to be either polar or nonpolar in response to the respective corresponding potential.
In one switching period, after the first switching tube S1 and the second switching tube S2 are controlled to be simultaneously turned on and continuously for a first time period, the first switching tube S1 and the second switching tube S2 are controlled to be simultaneously turned off and continuously for a second time period, so that the converter alternately works in a first working mode and a second working mode. In this embodiment, the first duration and the second duration depend on the switching period and the on duty ratio in one switching period, and when the on duty ratio is 0.5, the first duration and the second duration are equal.
As shown in fig. 2, when the dual-switch converter is in the first operation mode, the first switch tube S1 and the second switch tube S2 are turned on, the first diode D1 and the second diode D2 are turned off, and the power source VIN charges the first inductor L1, the second inductor L2, the third inductor L3, the first capacitor C1 and the second capacitor C2; the third capacitor C3 provides energy to the load R; the current of the first inductor L1, the current of the second inductor L2 and the current of the third inductor L3 rise linearly, and the potential of the first capacitor C1 and the potential of the second capacitor C2 rise upwards;
as shown in fig. 3, when the dual-switch converter is in the second operation mode, the first switch tube S1 and the second switch tube S2 are turned off, the first diode D1 and the second diode D2 are turned on, and the power source VIN, the first inductor L1, the second inductor L2, the third inductor L3, the first capacitor C1, and the second capacitor C2 provide energy to the load R and the third capacitor C3.
FIG. 4 is a main operation waveform diagram of the dual-switch converter in one working period according to the embodiment, in which V g1 ,V g2 Is the grid voltage of the first switching tube S1 and the second switching tube S2, I L1 ,I L2 Is the current of the first inductance L1 and the second inductance L2, I L3 For the current of the third inductance L3, V C3 At the voltage of the third capacitor C3, V C1 ,V C2 The voltage V of the first capacitor C1 and the second capacitor C2 S1 ,V S2 Is the voltage across the first switching tube S1 and the second switching tube S2, I S1 ,I S2 The drain-source currents of the first switching tube S1 and the second switching tube S2. As can be seen from the figure, when V g1 ,V g2 When the voltage is at a high level, the first switching tube S1 and the second switching tube S2 are turned on, the current of the first inductor L1 and the current of the second inductor L2 are equal at the same time, and the voltage of the first capacitor C1 and the voltage of the second capacitor C2 are equal at the same time.
The first working mode and the second working mode are two working modes of the boost double-switch converter in one period, and the duty ratio of the first switch tube S1 is
The duty cycle of the second switching tube S2 is +.>
Let->
When the two-switch converter is in a steady state, the following relationship is obtained by applying a volt-second balance to the first inductance L1, the second inductance L2 and the third inductance L3:
in the method, in the process of the invention,
is the voltage of the power VIN>
For the duty cycle of the switching tube +.>
For the voltage of the load R>
For the voltage of the first capacitor C1, +.>
Is the voltage of the second capacitor C2.
The average voltage across the inductor is zero in one period, namely:
in the method, in the process of the invention,
is the voltage of the power VIN>
For the voltage of the first capacitor C1, +.>
At the voltage of the second capacitor C2,
is the voltage of the third capacitor C3.
The voltages of the first capacitor C1, the second capacitor C2 and the third capacitor C3 are thus obtained, namely:
in the method, in the process of the invention,
is the voltage of the power VIN>
For the voltage of the first capacitor C1, +.>
At the voltage of the second capacitor C2,
for the voltage of the third capacitor C3 +.>
For the voltage of the load R>
Is the duty cycle of the switching tube.
The gain ratio of the input/output voltage is obtained according to the above
：
In the method, in the process of the invention,
is the voltage of the power VIN>
For the voltage of the load R>
Is the duty cycle of the switching tube.
Therefore, the double-switch converter provided by the embodiment can obtain larger voltage gain under a proper duty ratio, and the proper duty ratio avoids that the first switch tube S1 and the second switch tube S2 bear larger voltage stress, so that the transmission efficiency of the double-switch converter is improved.
Example 2
The embodiment of the application provides a control method of a double-switch converter.
As shown in fig. 1, the dual switching converter includes a first boost unit, a second boost unit, a third boost unit, a first switching tube S1, a second switching tube S2, and an output unit.
The first end of the first boosting unit is connected with the positive electrode of the power supply VIN, the second end of the first boosting unit is connected with the first end of the first switching tube S1, and the second end of the first switching tube S1 is connected with the negative electrode of the power supply VIN; the first boost unit comprises a first inductor L1, the first end of the first inductor L1 is the first end of the first boost unit, and the second end of the first inductor L1 is the second end of the first boost unit.
The first end of the second boosting unit is connected with the negative electrode of the power supply VIN, the second end of the second boosting unit is connected with the second end of the second switching tube S2, the second end of the second boosting unit is connected with the output unit, and the first end of the second switching tube S2 is connected with the positive electrode of the power supply VIN; the second boost unit comprises a second inductor L2, the first end of the second inductor L2 is the first end of the second boost unit, and the second end of the second inductor L2 is the second end of the second boost unit.
The first end of the third boosting unit is connected with the first end of the first switching tube S1, and the second end of the third boosting unit is connected with the output unit; the third boosting unit comprises a first capacitor C1, a second capacitor C2, a first diode D1, a second diode D2 and a third inductor L3; the first end of the first capacitor C1 is connected with the first end of the third inductor L3 and the anode of the second diode D2, the cathode of the second diode D2 is connected with the first end of the second capacitor C2, the second end of the second capacitor C2 is connected with the second end of the third inductor L3 and the cathode of the first diode D1, and the anode of the first diode D1 is connected with the second end of the first capacitor C1; the second end of the first capacitor C1 is the first end of the third boost unit, and the cathode of the second diode D2 is the second end of the third boost unit.
The first boosting unit, the second boosting unit and the third boosting unit are respectively used for supplying power to the output unit.
The output unit comprises a third capacitor C3, a first end of the third capacitor C3 is connected with a second end of the third boosting unit, and a second end of the third capacitor C3 is connected with a second end of the second boosting unit; the load R is connected in parallel to two ends of the third capacitor C3.
The first switch tube S1 is a field effect tube, the first end of the first switch tube S1 is a drain electrode of the field effect tube, the second end of the first switch tube S1 is a source electrode of the field effect tube, and the third end of the first switch tube S1 is a grid electrode of the field effect tube; the second switching tube S2 is a field effect tube, the first end of the second switching tube S2 is a drain electrode of the field effect tube, the second end of the second switching tube S2 is a source electrode of the field effect tube, and the third end of the second switching tube S2 is a grid electrode of the field effect tube.
The control method comprises the following steps:
in one switching period, after the first switching tube S1 and the second switching tube S2 are controlled to be simultaneously turned on and continuously for a first time period, the first switching tube S1 and the second switching tube S2 are controlled to be simultaneously turned off and continuously for a second time period, so that the double-switch converter alternately works in a first working mode and a second working mode. The first duration and the second duration depend on the switching period and the on-duty ratio in one switching period, and when the on-duty ratio is 0.5, the first duration and the second duration are equal.
As shown in fig. 2, when the dual-switch converter is in the first operation mode, the first switch tube S1 and the second switch tube S2 are turned on, the first diode D1 and the second diode D2 are turned off, and the power source VIN charges the first inductor L1, the second inductor L2, the third inductor L3, the first capacitor C1 and the second capacitor C2; the third capacitor C3 provides energy to the load R; the current of the first inductor L1, the current of the second inductor L2 and the current of the third inductor L3 rise linearly, and the potential of the first capacitor C1 and the potential of the second capacitor C2 rise upwards;
as shown in fig. 3, when the dual-switch converter is in the second operation mode, the first switch tube S1 and the second switch tube S2 are turned off, the first diode D1 and the second diode D2 are turned on, and the power source VIN, the first inductor L1, the second inductor L2, the third inductor L3, the first capacitor C1, and the second capacitor C2 provide energy to the load R and the third capacitor C3.
Therefore, the double-switch converter provided by the embodiment can obtain larger voltage gain under a proper duty ratio, and conversion efficiency is improved.
It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. And obvious variations or modifications thereof are contemplated as falling within the scope of the present invention.
Claims (9)
1. The double-switch converter is characterized by comprising a first boosting unit, a second boosting unit, a third boosting unit, a first switching tube (S1), a second switching tube (S2) and an output unit;
the first end of the first boosting unit is connected with the positive electrode of the power supply (VIN), the second end of the first boosting unit is connected with the first end of the first switching tube (S1), and the second end of the first switching tube (S1) is connected with the negative electrode of the power supply (VIN);
the first end of the second boosting unit is connected with the negative electrode of the power supply (VIN), the second end of the second boosting unit is connected with the second end of the second switching tube (S2), the second end of the second boosting unit is connected with the output unit, and the first end of the second switching tube (S2) is connected with the positive electrode of the power supply (VIN);
the first end of the third boost unit is connected with the first end of the first switch tube (S1) and the second end of the first boost unit, and the second end of the third boost unit is connected with the output unit;
the first boosting unit, the second boosting unit and the third boosting unit are respectively used for supplying power to the output unit.
2. A dual switching converter according to claim 1, wherein the third boost unit comprises a first capacitor (C1), a second capacitor (C2), a first diode (D1), a second diode (D2) and a third inductance (L3);
the first end of the first capacitor (C1) is connected with the first end of the third inductor (L3) and the anode of the second diode (D2), the cathode of the second diode (D2) is connected with the first end of the second capacitor (C2), the second end of the second capacitor (C2) is connected with the second end of the third inductor (L3) and the cathode of the first diode (D1), and the anode of the first diode (D1) is connected with the second end of the first capacitor (C1);
the second end of the first capacitor (C1) is the first end of the third boosting unit, and the cathode of the second diode (D2) is the second end of the third boosting unit.
3. The dual switching converter according to claim 2, wherein the first boost unit comprises a first inductor (L1), the first end of the first inductor (L1) being the first end of the first boost unit, and the second end of the first inductor (L1) being the second end of the first boost unit.
4. A dual switching converter according to claim 3, wherein the second boost unit comprises a second inductor (L2), the first end of the second inductor (L2) being the first end of the second boost unit, the second end of the second inductor (L2) being the second end of the second boost unit.
5. The dual switching converter according to claim 4, wherein the output unit comprises a third capacitor (C3), a first end of the third capacitor (C3) being connected to a second end of the third boost unit, a second end of the third capacitor (C3) being connected to a second end of the second boost unit; the load (R) is connected in parallel to two ends of the third capacitor (C3).
6. A double-switch converter according to any of claims 1-5, wherein the first switching tube (S1) is a field effect tube, the first end of the first switching tube (S1) is a drain of the field effect tube, the second end of the first switching tube (S1) is a source of the field effect tube, and the third end of the first switching tube (S1) is a gate of the field effect tube;
the second switching tube (S2) is a field effect tube, the first end of the second switching tube (S2) is a drain electrode of the field effect tube, the second end of the second switching tube (S2) is a source electrode of the field effect tube, and the third end of the second switching tube (S2) is a grid electrode of the field effect tube.
7. A dual switching converter according to any of claims 1-5, wherein the gain ratio of the input voltage to the output voltage of the dual switching converter is
Wherein M is the gain ratio of the input voltage and the output voltage of the double-switch converter, D is the on duty ratio of the first switch tube (S1), and the on duty ratio of the second switch tube (S2) is the same as the on duty ratio of the first switch tube (S1).
8. A control method of a two-switch converter according to claim 5, comprising the steps of:
in one switching period, the first switching tube (S1) and the second switching tube (S2) are controlled to be simultaneously conducted, and after a first time period is continued, the first switching tube (S1) and the second switching tube (S2) are controlled to be simultaneously turned off, and a second time period is continued, so that the converter alternately works in two working modes.
9. The control method of a dual-switch converter of claim 8, wherein the two modes of operation are a first mode of operation and a second mode of operation, respectively;
first working mode: the first switching tube (S1) and the second switching tube (S2) are conducted, the first diode (D1) and the second diode (D2) are cut off, and the power supply (VIN) charges the first inductor (L1), the second inductor (L2), the third inductor (L3), the first capacitor (C1) and the second capacitor (C2); a third capacitor (C3) for supplying energy to the load (R);
second mode of operation: the first switching tube (S1) and the second switching tube (S2) are turned off, the first diode (D1) and the second diode (D2) are turned on, and the power supply (VIN), the first inductor (L1), the second inductor (L2), the third inductor (L3), the first capacitor (C1) and the second capacitor (C2) supply energy to the load (R) and the third capacitor (C3).
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