CN115940641A - Boost converter - Google Patents

Boost converter Download PDF

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Publication number
CN115940641A
CN115940641A CN202310222167.1A CN202310222167A CN115940641A CN 115940641 A CN115940641 A CN 115940641A CN 202310222167 A CN202310222167 A CN 202310222167A CN 115940641 A CN115940641 A CN 115940641A
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capacitor
diode
boost
inductor
module
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CN115940641B (en
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乐卫平
林伟群
唐亚海
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Shenzhen CSL Vacuum Science and Technology Co Ltd
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Shenzhen CSL Vacuum Science and Technology Co Ltd
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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

Abstract

The invention relates to a boost converter, which comprises a first boost module, a second boost module and an output module; the second boosting module comprises a switch network, and the switch network comprises a first diode, a second capacitor, a third capacitor and a second inductor; the cathode of the first diode is connected with the first end of the second inductor and the second end of the second capacitor, and the second end of the second inductor is connected with the first end of the third capacitor and the anode of the second diode; the first boosting module comprises a first switch tube, and when the first switch tube is switched on, the first diode and the second diode are switched off; when the first switch tube is turned off, the first diode and the second diode are conducted; the output module is connected with the second boosting module, and the boosting converter solves the problem that the voltage gain of the existing converter is low.

Description

Boost converter
Technical Field
The invention relates to the technical field of converters, in particular to a boost converter.
Background
The DC-DC converter has a wide range of applications due to its extremely high efficiency and wide range of input and output. Conventional DC-DC converters such as Buck-Boost, cuk, sepic and Zeta can be used to provide Boost or Buck gain, but their voltage gain is limited, and the duty ratio needs to be increased to increase the voltage gain, which may result in low efficiency of the converter.
Disclosure of Invention
The invention provides a boost converter aiming at the defect of low voltage gain of the converter in the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme: a boost converter comprises a first boost module, a second boost module and an output module;
the second boosting module comprises a switch network, and the switch network comprises a first diode, a second capacitor, a third capacitor and a second inductor;
the cathode of the first diode is connected with the first end of the second inductor and the second end of the second capacitor, and the second end of the second inductor is connected with the first end of the third capacitor and the anode of the second diode;
the first boosting module comprises a first switch tube, and when the first switch tube is switched on, the first diode and the second diode are switched off; when the first switch tube is turned off, the first diode and the second diode are conducted;
the output module is connected with the second boosting module.
Preferably, the second voltage boost module further includes a second voltage boost unit, a first end of the second voltage boost unit is connected to the first voltage boost module, and a second end of the second voltage boost unit is connected to an anode of the first diode.
Preferably, the second voltage boosting module further includes a third voltage boosting unit, a first end of the third voltage boosting unit is connected to the second end of the third capacitor, and a second end of the third voltage boosting unit is connected to the output module.
Preferably, the first voltage boosting module further includes a first voltage boosting unit, a first end of the first voltage boosting unit is connected to a positive electrode of the power supply, a second end of the first voltage boosting unit is connected to a first end of the first switching tube, and a second end of the first switching tube is connected to a negative electrode of the power supply.
Preferably, the output module includes an output capacitor, a first end of the output capacitor is connected to a cathode of the second diode, and a second end of the output capacitor is connected to a second end of the third voltage boost unit; the load is connected in parallel with two ends of the output capacitor.
Preferably, the first boosting unit is a first inductor.
Preferably, the second voltage boosting unit is a first capacitor.
Preferably, the third voltage boosting unit is a third inductor.
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.
Preferably, the boost converter comprises a first working mode and a second working mode in one switching cycle;
a first mode of operation: the first switch tube is conducted, the first diode and the second diode are cut off, and the power supply charges the first inductor; the first capacitor charges the second capacitor, the third capacitor and the second inductor; the output capacitor supplies power to the load, and the output capacitor charges the third inductor;
the second working mode is as follows: the first switch Guan Jiezhi is used for switching on the first diode and the second diode, and the power supply, the first inductor and the second capacitor charge the first capacitor; the second inductor, the third inductor, the second capacitor and the third capacitor supply power to the load.
Has the advantages that: under the same duty ratio, the converter provided by the embodiment has twice the voltage gain of the conventional converter, and the voltage stress of the first switching tube, the first diode and the second diode is low and half of that of the conventional converter, so that the transmission efficiency of the converter is high.
Drawings
The invention is described in further detail below with reference to the figures and the specific embodiments.
Fig. 1 is a schematic diagram of a boost converter according to an embodiment of the present invention.
Fig. 2 is a second topology structure diagram of a boost converter according to the present invention.
Fig. 3 is a circuit diagram of an operating mode of a boost converter according to the present invention.
Fig. 4 is a circuit diagram of an operation of a boost converter in a second operation mode according to the present invention.
Fig. 5 is one of the main operation waveforms of a boost converter provided by the present invention in one switching period.
Fig. 6 is a second diagram of the main operating waveforms of a boost converter in a switching cycle according to the present invention.
Reference numerals: VIN, power supply; l1, a first inductor; l2 and a second inductor; l3, a third inductor; s1, a first switch tube; d1, a first diode; d2, a second diode; c1, a first capacitor; c2, a second capacitor; c3, a third capacitor; co, output capacitance; r, load; 10. a first boosting unit; 20. a second boosting unit; 30. a switching network; 40. and a fourth boosting unit.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. 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.
Example 1
Referring to fig. 1, the present embodiment provides a boost converter including a first boost module, a second boost module, and an output module.
Referring to fig. 2, the first boost module includes a first boost unit 10 and a first switching tube S1, where the first boost unit 10 is a first inductor L1; the first end of the first inductor L1 and the second end of the first switch tube S1 are input ends of the converter, and the input ends are connected to the power supply VIN, specifically, the first end of the first inductor L1 is connected to an anode of the power supply VIN, the second end of the first switch tube S1 is connected to a cathode of the power supply VIN, and the second end of the first inductor L1 is connected to the first end of the first switch tube S1.
In this embodiment, the first switch tube S1 is a field effect transistor, the first terminal of the first switch tube S1 is a drain of the field effect transistor, the second terminal of the first switch tube S1 is a source of the field effect transistor, and the third terminal of the first switch tube S1 is a gate of the field effect transistor.
The second boost module comprises a second boost unit 20, a third boost unit 40 and a switch network 30, the second boost unit 20 is a first capacitor C1, the third boost unit 40 is a third inductor L3, and the switch network 30 comprises a first diode D1, a second diode D2, a second capacitor C2, a third capacitor C3 and a second inductor L2;
the first end of the first capacitor C1 is connected to the second end of the first inductor L1, the second end of the first capacitor C1 is connected to the anode of the first diode D1, the second end of the third capacitor C3 and the first end of the third inductor L3, the cathode of the first diode D1 is connected to the second end of the second capacitor C2 and the first end of the second inductor L2, the first end of the third capacitor C3 is connected to the second end of the second inductor L2 and the anode of the second diode D2, and the second end of the first switch tube S1 is connected to the first end of the second capacitor C2 and the cathode of the second diode D2.
The output module comprises an output capacitor Co, a first end of the output capacitor Co is connected with the cathode of the second diode D2, and a second end of the output capacitor Co is connected with a second end of the third inductor L3. The two ends of the output capacitor Co are output ends of the converter, the voltage at the two ends of the output capacitor Co is output voltage, and the load R is connected in parallel with the two ends of the output capacitor Co; specifically, a first end of the output capacitor Co is connected to the positive electrode of the load R, and a second end of the output capacitor Co is connected to the negative electrode of the load R.
The boost converter has a first mode and a second mode within one cycle.
As shown in fig. 3, when the converter is in the first mode, the first switching tube S1 is 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 first capacitor C1 charges the second capacitor C2, the third capacitor C3 and the second inductor L2; the output capacitor Co charges the dc load R and the third inductor L3.
As shown in fig. 4, when the converter is in the second mode, the first switching tube S1 is turned off, the first diode D1 and the second diode D2 are turned on, and the power source VIN, the first inductor L1, and the second capacitor C2 charge the first capacitor C1; the second inductor L2, the third inductor L3, the second capacitor C2 and the third capacitor C3 discharge electric energy to be supplied to the dc load R.
The voltage gain of the converter provided by the embodiment is twice that of the conventional converter, and the voltage stress of the first switching tube S1, the first diode D1 and the second diode D2 of the converter provided by the embodiment is low, and is half that of the conventional converter; the converter realizes high voltage gain, and enables the first switch tube S1, the first diode D1 and the second diode D2 to bear lower voltage stress, thereby ensuring the transmission efficiency of the converter.
Example 2
Referring to fig. 1 and 2, in particular, a boost converter includes a first boost module, a second boost module and an output module;
the first boosting module comprises a first boosting unit 10 and a first switching tube S1, wherein the first boosting unit 10 is a first inductor L1;
the first end of the first inductor L1 and the second end of the first switch tube S1 are input ends of the converter, and the input ends are connected to the power supply VIN, specifically, the first end of the first inductor L1 is connected to an anode of the power supply VIN, the second end of the first switch tube S1 is connected to a cathode of the power supply VIN, and the second end of the first inductor L1 is connected to the first end of the first switch tube S1.
In this embodiment, the first switch tube S1 is a field effect transistor, the first terminal of the first switch tube S1 is a drain of the field effect transistor, the second terminal of the first switch tube S1 is a source of the field effect transistor, and the third terminal of the first switch tube S1 is a gate of the field effect transistor.
The second boost module includes a second boost unit 20, a switch network 30 and a third boost unit 40, the second boost unit 20 is a first capacitor C1, the switch network 30 includes a first diode D1, a second diode D2, a second capacitor C2, a third capacitor C3 and a second inductor L2, and the third boost unit 40 is a third inductor L3.
The first end of the first capacitor C1 is connected to the second end of the first inductor L1, the second end of the first capacitor C1 is connected to the anode of the first diode D1, the second end of the third capacitor C3 and the first end of the third inductor L3, the cathode of the first diode D1 is connected to the second end of the second capacitor C2 and the first end of the second inductor L2, the first end of the third capacitor C3 is connected to the second end of the second inductor L2 and the anode of the second diode D2, and the second end of the first switch tube S1 is connected to the first end of the second capacitor C2 and the cathode of the second diode D2.
The output module comprises an output capacitor Co, two ends of the output capacitor Co are output ends of the converter, specifically, a first end of the output capacitor Co is connected with an anode of the load R and a cathode of the power supply VIN, and a second end of the output capacitor Co is connected with a cathode of the load R and a second end of the third inductor.
The first switching tube S1 of the first boost module is used to control the on/off of the first diode D1 and the second diode D2, and control the current path in the converter, so that each device is charged and discharged in order, the voltage of the output capacitor Co is increased, and the high voltage gain of the converter is realized.
In this embodiment, the first capacitor C1, the second capacitor C2, the third capacitor C3 and the output capacitor Co are all nonpolar capacitors.
The boost converter has a first mode and a second mode within one cycle.
As shown in fig. 3, when the converter is in the first mode, the first switching tube S1 is 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 first capacitor C1 charges the second capacitor C2, the third capacitor C3 and the second inductor L2; the output capacitor Co charges the dc load R and the third inductor L3.
As shown in fig. 4, when the converter is in the second mode, the first switching tube S1 is turned off, the first diode D1 and the second diode D2 are turned on, and the power supply VIN, the first inductor L1 and the second capacitor C2 charge the first capacitor C1; the second inductor L2, the third inductor L3, the second capacitor C2 and the third capacitor C3 discharge electric energy to be supplied to the load R.
Fig. 5 and 6 are waveforms illustrating the main operation of the converter of this embodiment in one operation cycle, in which,
Figure SMS_3
is a cross-pressure of a first switching tube S1, is overcome>
Figure SMS_5
Is the voltage of the first capacitance C1, is greater or less>
Figure SMS_7
Is the voltage of the second capacitance C2>
Figure SMS_2
Is the voltage of a third capacitance C3>
Figure SMS_4
Is the voltage of the load R>
Figure SMS_6
Is the current of the first inductor L1, is greater than or equal to->
Figure SMS_8
Is the current of the second inductor L2,
Figure SMS_1
is the current of the third inductor L3. In the charging and discharging processes, the voltage of the first capacitor C1, the voltage of the second capacitor C2 and the voltage of the third capacitor C3 are almost constant, so that ripples can be ignored.
When the converter is in a steady state, the following relationship can be obtained in the steady state by applying volt-second balance to the first inductor L1, the second inductor L2, and the third inductor L3:
Figure SMS_9
；
Figure SMS_10
；
Figure SMS_11
；
in the formula (I), the compound is shown in the specification,
Figure SMS_12
is the voltage of the power VIN>
Figure SMS_13
Is the duty cycle of the first switching tube S1, is greater than>
Figure SMS_14
Is the voltage of the first capacitance C1, is greater or less>
Figure SMS_15
Is the voltage of the second capacitance C2->
Figure SMS_16
Is the voltage of the third capacitance C3->
Figure SMS_17
Is the voltage of the load R.
The voltages of the first capacitor C1, the second capacitor C2, and the third capacitor C3 can be obtained by the following formula:
Figure SMS_18
；
Figure SMS_19
；
in the formula (I), the compound is shown in the specification,
Figure SMS_20
is the voltage of the power VIN>
Figure SMS_21
Is the duty cycle of the first switching tube S1, is greater than>
Figure SMS_22
Is the voltage of the first capacitance C1, is greater or less>
Figure SMS_23
Is the voltage of the second capacitance C2->
Figure SMS_24
Is the voltage of the third capacitor C3.
Further gain ratio of input voltage and output voltage can be obtained
Figure SMS_25
Voltage stress of the first diode D1, the second diode D2 and the switch tube:
Figure SMS_26
；
Figure SMS_27
；/>
Figure SMS_28
；
in the formula (I), the compound is shown in the specification,
Figure SMS_29
is the drain-source voltage of the first switching tube S1->
Figure SMS_30
Is the voltage of the power VIN>
Figure SMS_31
Is the voltage of the load R and is,
Figure SMS_32
is the duty cycle of the first switching tube S1, is greater than>
Figure SMS_33
Is the voltage of the first diode D1, is greater or less>
Figure SMS_34
Is the voltage of the second diode D2.
Therefore, under the same duty ratio, the voltage gain of the converter provided by the embodiment is twice that of the conventional converter, and the voltage stress of the first switching tube S1, the first diode D1 and the second diode D2 of the converter provided by the embodiment is low and is half that of the conventional converter; the converter realizes high voltage gain, and enables the first switch tube S1, the first diode D1 and the second diode D2 to bear lower voltage stress, thereby ensuring the transmission efficiency of the converter. And the input and output currents of the converter provided by the embodiment are continuous without additional filtering devices, and the input end and the output end of the converter provided by the embodiment are in common ground.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications of the invention may be made without departing from the spirit or scope of the invention.

Claims (10)

1. A boost converter is characterized by comprising a first boost module, a second boost module and an output module;
the second boost module comprises a switch network (30), and the switch network (30) comprises a first diode (D1), a second diode (D2), a second capacitor (C2), a third capacitor (C3) and a second inductor (L2); the cathode of the first diode (D1) is connected with the first end of the second inductor (L2) and the second end of the second capacitor (C2), and the second end of the second inductor (L2) is connected with the first end of the third capacitor (C3) and the anode of the second diode (D2);
the first boosting module comprises a first switch tube (S1), and when the first switch tube (S1) is switched on, a first diode (D1) and a second diode (D2) are switched off; when the first switch tube (S1) is turned off, the first diode (D1) and the second diode (D2) are conducted;
the output module is connected with the second boosting module.
2. A boost converter according to claim 1, characterized in that said second boost module further comprises a second boost unit (20), a first terminal of said second boost unit (20) being connected to the first boost module, and a second terminal of said second boost unit (20) being connected to the anode of the first diode (D1).
3. A boost converter according to claim 2, characterized in that said second boost module further comprises a third boost unit (40), a first terminal of the third boost unit (40) being connected to the second terminal of the third capacitor (C3), and a second terminal of the third boost unit (40) being connected to the output module.
4. A boost converter according to claim 3, characterized in that said first boost module further comprises a first boost unit (10), a first end of said first boost unit (10) is connected to the positive pole of the power supply (VIN), a second end of said first boost unit (10) is connected to a first end of the first switch tube (S1), and a second end of the first switch tube (S1) is connected to the negative pole of the power supply (VIN).
5. A boost converter according to claim 4, characterized in that said output module comprises an output capacitor (Co), a first terminal of the output capacitor (Co) being connected to the cathode of the second diode (D2), a second terminal of the output capacitor (Co) being connected to a second terminal of the third boost unit (40); the load (R) is connected in parallel with two ends of the output capacitor (Co).
6. A boost converter according to claim 5, characterized in that said first boost unit (10) is a first inductor (L1).
7. A boost converter according to claim 6, characterised in that said second boost unit (20) is a first capacitor (C1).
8. A boost converter according to claim 7, characterized in that said third boost unit (40) is a third inductor (L3).
9. A boost converter according to any of claims 1-8, characterized in that the first switch (S1) is a FET, the first terminal of the first switch (S1) is the drain of the FET, the second terminal of the first switch (S1) is the source of the FET, and the third terminal of the first switch (S1) is the gate of the FET.
10. A boost converter according to any of claims 1-8, characterized in that said boost converter comprises a first mode of operation and a second mode of operation in one switching cycle;
a first working mode: the first switch tube (S1) is conducted, the first diode (D1) and the second diode (D2) are cut off, and the power supply (VIN) charges the first inductor (L1); the first capacitor (C1) charges the second capacitor (C2), the third capacitor (C3) and the second inductor (L2); the output capacitor (Co) supplies power to the load (R), and the output capacitor (Co) charges the third inductor (L3);
the second working mode is as follows: the first switch tube (S1) is cut off, the first diode (D1) and the second diode (D2) are conducted, and the power supply (VIN), the first inductor (L1) and the second capacitor (C2) charge the first capacitor (C1); the second inductor (L2), the third inductor (L3), the second capacitor (C2) and the third capacitor (C3) supply power to the load (R).
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CN116111844A (en) * 2023-04-13 2023-05-12 深圳市恒运昌真空技术有限公司 Dual-switch converter and control method thereof
CN116169882A (en) * 2023-04-26 2023-05-26 深圳市恒运昌真空技术有限公司 High-gain boost converter
CN116488456A (en) * 2023-06-21 2023-07-25 深圳市恒运昌真空技术有限公司 Voltage conversion circuit and voltage converter

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CN116169882A (en) * 2023-04-26 2023-05-26 深圳市恒运昌真空技术有限公司 High-gain boost converter
CN116488456A (en) * 2023-06-21 2023-07-25 深圳市恒运昌真空技术有限公司 Voltage conversion circuit and voltage converter

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