CN116317548B - Voltage conversion circuit and voltage converter - Google Patents

Voltage conversion circuit and voltage converter Download PDF

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Publication number
CN116317548B
CN116317548B CN202310577747.2A CN202310577747A CN116317548B CN 116317548 B CN116317548 B CN 116317548B CN 202310577747 A CN202310577747 A CN 202310577747A CN 116317548 B CN116317548 B CN 116317548B
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China
Prior art keywords
diode
voltage
energy
module
unit
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CN202310577747.2A
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CN116317548A (en
Inventor
乐卫平
林伟群
马泽鹤
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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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Classifications

    • 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
    • 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
    • H02M1/0048—Circuits or arrangements for reducing losses
    • H02M1/0051—Diode reverse recovery losses
    • 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
    • H02M1/0048—Circuits or arrangements for reducing losses
    • H02M1/0054—Transistor switching losses
    • 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
    • H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
    • H02M1/007—Plural converter units in cascade
    • 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 discloses a voltage conversion circuit and a voltage converter, and belongs to the field of converter operation. The voltage conversion circuit is provided with a first boosting module and a second boosting module; the power supply module transmits the generated power supply voltage to the first boosting module and the second boosting module; the first boosting module boosts the power supply voltage once when receiving the power supply voltage output by the power supply module, obtains a first boosted voltage and transmits the first boosted voltage to the second boosting module; the second boost module boosts the first boost voltage for the second time to obtain a second boost voltage, and transmits the second boost voltage to the load. The power supply voltage is boosted once by the first boosting module to obtain the first boosted voltage, and the first boosted voltage is boosted twice by the second boosting module to obtain the second boosted voltage, so that the duty ratio can be reduced by boosting twice, and the reverse recovery loss and the switching loss of the output diode are reduced.

Description

Voltage conversion circuit and voltage converter
Technical Field
The present invention relates to the field of converters, and in particular, to a voltage conversion circuit and a voltage converter.
Background
With the rapid development of global economy, environmental pollution and energy shortage are becoming serious, and solar energy, wind energy, wave energy and other energy sources are receiving extensive attention because of good and renewable environment. However, renewable energy power generation systems have low voltage levels and are difficult to meet in high voltage applications in distributed power generation systems. Therefore, a high voltage conversion ratio dc converter is required to convert a low voltage level to a high voltage.
The existing Boost converter can achieve infinite voltage conversion ratio under the condition of an extreme duty ratio, however, under the condition of the extreme duty ratio, reverse recovery loss and switching loss of an output diode are large, and the efficiency of the voltage conversion ratio is limited by equivalent series resistance of a capacitor and parasitic inductance.
Disclosure of Invention
The invention mainly aims to provide a voltage conversion circuit and a voltage converter, and aims to solve the technical problems that in the prior art, under the condition of an extreme duty ratio, the reverse recovery loss and the switching loss of an output diode are large.
In order to achieve the above object, the present invention provides a voltage conversion circuit including: the system comprises a first boosting module and a second boosting module, wherein the first boosting module or the second boosting module is a BOOST boosting module;
the first boosting module is respectively connected with the power supply module and the second boosting module, and the second boosting module is respectively connected with the power supply module and the load;
the power supply module is used for transmitting the generated power supply voltage to the first boosting module and the second boosting module;
the first boosting module is used for boosting the power supply voltage once when receiving the power supply voltage output by the power supply module, obtaining a first boosted voltage and transmitting the first boosted voltage to the second boosting module;
the second boost module is configured to boost the first boost voltage for a second time to obtain a second boost voltage, and transmit the second boost voltage to the load.
Optionally, the first boost module includes: the first energy supply unit, the first energy storage unit and the first switching unit;
the first energy supply unit is respectively connected with the power supply module and the first switching unit, and the first switching unit is respectively connected with the second boosting module and the first energy storage unit;
the first energy supply unit is used for storing energy provided by the power supply module and the first energy storage unit when the first switching unit is in a first mode;
the first energy storage unit is used for storing energy provided by the power supply module and the first energy supply unit when the first switching unit is in the second mode so as to boost the power supply voltage once to obtain a first boosted voltage.
Optionally, the second boost module includes: the device comprises a second energy storage unit, a second energy supply unit, a third energy storage unit, a third energy supply unit and a second switching unit;
the second energy storage unit is respectively connected with the power supply module and the second energy supply unit, the second energy supply unit is respectively connected with the third energy storage unit and the first energy supply unit, the third energy storage unit is connected with the third energy supply unit and the load, the third energy supply unit is also connected with the load, and the second switching unit is connected with the second energy storage unit;
the second energy supply unit is used for storing energy provided by the second energy storage unit when the second switching unit is in the first mode;
the third energy supply unit is used for storing energy provided by the third energy storage unit when the second switching unit is in the first mode;
the third energy storage unit is used for providing energy for the load when the second switching unit is in the first mode;
the second energy storage unit is used for storing energy provided by the power supply module when the second switching unit is in the second mode;
the third energy storage unit is used for storing energy provided by the power supply module, the first energy supply unit and the second energy supply unit when the second switching unit is in the second mode so as to secondarily boost the first boosted voltage to obtain a second boosted voltage;
the third energy supply unit is configured to supply energy to the load when the second switching unit is in the second mode.
Optionally, the first energy supply unit includes: the first inductor, the second inductor, the first diode and the third diode;
the anode of the first diode is connected with the first end of the second inductor, the anode of the first diode is also connected with the positive electrode of the direct current power supply in the power supply module, the cathode of the first diode is respectively connected with the cathode of the second diode and the first end of the first inductor, the anode of the second diode is respectively connected with the second end of the second inductor and the anode of the third diode, and the cathode of the third diode is respectively connected with the second end of the first inductor and the first switching unit.
Optionally, the first switching unit includes: the first switch tube, the second switch tube, the fourth diode and the fifth diode;
the anode of the fourth diode is connected with the cathode of the third diode and the input end of the second switching tube respectively, the cathode of the fourth diode is connected with the input end of the first switching tube and the first energy storage unit respectively, the output end of the first switching tube is connected with the cathode of the fifth diode and the cathode of the direct current power supply respectively, and the output end of the second switching tube is connected with the first energy storage unit and the anode of the fifth diode respectively.
Optionally, the first energy storage unit includes: a first capacitor;
the first end of the first capacitor is connected with the cathode of the fourth diode, and the second end of the first capacitor is connected with the anode of the fifth diode.
Optionally, the second energy storage unit includes: coupling the inductor, the sixth diode and the seventh diode;
the same-name end of the primary winding of the coupling inductor is connected with the anode of the first diode, the other end of the primary winding is connected with the anode of the sixth diode, the cathode of the sixth diode is connected with the same-name end of the secondary winding of the coupling inductor, the other end of the secondary winding is connected with the second switching unit and the anode of the seventh diode, and the cathode of the seventh diode is connected with the second energy supply unit.
Optionally, the second switching unit includes: a third switching tube;
the input end of the third switching tube is connected with the anode of the seventh diode, and the output end of the third switching tube is connected with the cathode of the direct-current power supply.
Optionally, the second energy supply unit includes: a second capacitor;
the first end of the second capacitor is connected with the input end of the second switching tube, and the second end of the second capacitor is connected with the cathode of the seventh diode and the third energy storage unit.
Optionally, the third energy storage unit includes: a third capacitor, an eighth diode, and a ninth diode;
the first end of the third capacitor is connected with the anode of the seventh diode, the second end of the third capacitor is connected with the cathode of the eighth diode and the anode of the ninth diode respectively, the anode of the eighth diode is connected with the cathode of the seventh diode, the cathode of the ninth diode is connected with the third energy supply unit and the first end of the load respectively, and the second end of the load is connected with the output end of the third switch tube.
Optionally, the third energy supply unit includes: a fourth capacitor;
the first end of the fourth capacitor is connected with the cathode of the ninth diode, and the second end of the fourth capacitor is connected with the second end of the load.
Optionally, the voltage conversion circuit further includes: a fifth capacitor;
the first end of the fifth capacitor is connected with the anode of the sixth diode, and the second end of the fifth capacitor is connected with the anode of the seventh diode.
Optionally, the voltage conversion circuit further includes: a sixth capacitor;
the first end of the sixth capacitor is connected with the cathode of the sixth diode, and the second end of the sixth capacitor is connected with the cathode of the fifth diode.
Furthermore, to achieve the above object, the present invention also proposes a voltage converter comprising the voltage converting circuit described above.
According to the invention, a first boosting module and a second boosting module are arranged in a voltage conversion circuit, and the first boosting module or the second boosting module is a BOOST boosting module; the first boosting module is respectively connected with the power supply module and the second boosting module, and the second boosting module is respectively connected with the power supply module and the load; the power supply module is used for transmitting the generated power supply voltage to the first boosting module and the second boosting module; the first boosting module is used for boosting the power supply voltage once when receiving the power supply voltage output by the power supply module, obtaining a first boosted voltage and transmitting the first boosted voltage to the second boosting module; the second boost module is configured to boost the first boost voltage for a second time to obtain a second boost voltage, and transmit the second boost voltage to the load. Because the first boosting module is adopted to Boost the power supply voltage once to obtain the first boosted voltage, and the second boosting module is adopted to Boost the first boosted voltage twice to obtain the second boosted voltage, compared with the prior Boost converter which has the duty ratio in extreme condition for realizing higher voltage conversion ratio, the invention can reduce the duty ratio through twice boosting, thereby reducing the reverse recovery loss and the switching loss of the output diode.
Drawings
FIG. 1 is a schematic circuit diagram of a voltage converting circuit according to a first embodiment of the present invention;
FIG. 2 is a schematic circuit diagram of a voltage conversion circuit according to a second embodiment of the present invention;
FIG. 3 is a circuit diagram illustrating a second embodiment of the voltage conversion circuit according to the present invention in a first mode;
FIG. 4 is a circuit diagram illustrating a second mode of operation of the voltage conversion circuit according to the second embodiment of the present invention;
fig. 5 is a diagram showing the parameter variation of a part of components of the voltage conversion circuit under a certain duty ratio.
Reference numerals illustrate:
the achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Referring to fig. 1, fig. 1 is a schematic circuit diagram of a voltage conversion circuit according to a first embodiment of the present invention.
In this embodiment, the voltage conversion circuit includes: a first BOOST module 20 and a second BOOST module 30, wherein the first BOOST module 20 or the second BOOST module 30 is a BOOST module; the first boost module 20 is connected to the power module 10 and the second boost module 30, and the second boost module 30 is connected to the power module 10 and the load R.
It should be noted that the circuit provided in this embodiment may be applied to any scenario in which BOOST is performed by a BOOST circuit, and of course, may be used in other boosting scenarios, which is not limited in this embodiment.
It should be understood that the first BOOST module 20 or the second BOOST module 30 is a BOOST module, and the present embodiment is illustrated by the first BOOST module 20 being a BOOST module, but not limited thereto.
In the present embodiment, the power module 10 is configured to transmit the generated power supply voltage to the first voltage boosting module 20 and the second voltage boosting module 30; the first boost module 20 is configured to boost the power supply voltage once when receiving the power supply voltage output by the power supply module 10, obtain a first boosted voltage, and transmit the first boosted voltage to the second boost module 30; the second boost module 30 is configured to boost the first boost voltage twice to obtain a second boost voltage, and transmit the second boost voltage to the load R.
It should be understood that the power supply voltage may be a dc voltage that needs to be boosted, and the specific voltage value is not limited in this embodiment.
It should be emphasized that the second boost module 30 may boost the first boost voltage twice by the power voltage provided by the power module 10, and neither the conversion ratio of the first boost nor the conversion ratio of the second boost is limited in this embodiment.
In a specific implementation, after the first boost module 20 receives the power supply voltage provided by the power supply module 10, it may perform primary boost, transmit the obtained first boost voltage to the second boost module 30, perform secondary boost on the first boost voltage by the power supply voltage by the second boost module 30, and transmit the obtained second boost voltage to the load R. Because the embodiment adopts a twice boosting mode, the duty ratio can be further reduced, and the reverse recovery loss and the switching loss of the output diode are reduced.
Further, with continued reference to fig. 1, in this embodiment, the first boost module 20 includes: a first energy supply unit 21, a first energy storage unit 22 and a first switching unit 23; the first energy supply unit 21 is connected to the power supply module 10 and the first switching unit 23, and the first switching unit 23 is connected to the second voltage boosting module 30 and the first energy storage unit 22.
The first energy supply unit 21 is configured to store energy provided by the power supply module 10 and the first energy storage unit 22 when the first switching unit 23 is in the first mode; the first energy storage unit 22 is configured to store energy provided by the power module 10 and the first energy supply unit 21 when the first switching unit 23 is in the second mode, so as to boost the power voltage once, and obtain a first boosted voltage.
It can be understood that the voltage conversion circuit in this embodiment has two modes, namely, the first mode and the second mode, and the state of the first switching unit 23 can be used to determine whether the voltage conversion circuit is in the first mode or the second mode, when the first switching unit 23 is turned on, the first voltage boosting module 20 is in the first mode, the first energy supply unit 21 can store the energy provided by the power supply module 10 and the first energy storage unit 22, and when the first switching unit 23 is turned off, the first voltage boosting module 20 is in the second mode, and the first energy storage unit 22 can store the energy provided by the power supply module 10 and the first energy supply unit 21, so as to boost the power supply voltage once.
Further, with continued reference to fig. 1, in this embodiment, the second boost module 30 includes: a second energy storage unit 31, a second energy supply unit 32, a third energy storage unit 34, a third energy supply unit 35, and a second switching unit 33; the second energy storage unit 31 is connected with the power supply module 10 and the second energy supply unit 32, the second energy supply unit 32 is connected with the third energy storage unit 34 and the first energy supply unit 21, the third energy storage unit 34 is connected with the third energy supply unit 35 and the load R, the third energy supply unit 35 is also connected with the load R, and the second switching unit 33 is connected with the second energy storage unit 31.
It should be appreciated that the second energy supply unit 32 is configured to store energy provided by the second energy storage unit 31 when the second switching unit 33 is in the first mode; the third energy supply unit 35 is configured to store energy provided by the third energy storage unit 34 when the second switching unit 33 is in the first mode; the third energy storage unit 34 is configured to provide energy to the load R when the second switching unit 33 is in the first mode.
It should be noted that, in the present embodiment, the states of the first switching unit 23 and the second switching unit 33 may be used to determine whether the first mode or the second mode is performed, and when the first switching unit 23 is turned on and the second switching unit 33 is turned off, the first mode is performed, and when the first switching unit 23 is turned off and the second switching unit 33 is turned on, the second mode is performed.
In a specific implementation, when the second switching unit 33 is in the first mode, the second energy supply unit 32 may store energy provided by the second energy storage unit 31, the third energy supply unit 35 may store energy provided by the third energy storage unit 34, and the third energy storage unit 34 may also provide energy to the load R.
It should be further noted that, when the second switching unit 33 is in the second mode, the second energy storage unit 31 is configured to store energy provided by the power module 10; the third energy storage unit 34 is configured to store energy provided by the power module 10, the first energy supply unit 21, and the second energy supply unit 32 when the second switching unit 33 is in the second mode, so as to secondarily boost the first boost voltage to obtain a second boost voltage; the third energy supply unit 35 is configured to supply energy to the load R when the second switching unit 33 is in the second mode.
In a specific implementation, when the second switching unit 33 is in the second mode, the second energy storage unit 31 may store energy provided by the power module 10, the third energy storage unit 34 may store energy provided by the power module 10, the first energy supply unit 21 and the second energy supply unit 32, and the third energy supply unit 35 may provide energy to the load R.
In this embodiment, when the first switching unit 23 and the second switching unit 33 are in the first mode, the power module 10 and the first energy storage unit 22 supply energy to the first energy supply unit 21, the second energy storage unit 31 supplies energy to the second energy supply unit 32, and the third energy storage unit 34 supplies energy to the third energy supply unit 35 and the load R; when the first switching unit 23 and the second switching unit 33 are in the second mode, the power module 10 and the first energy supply unit 21 supply energy to the first energy storage unit 22 to boost the power voltage once to obtain a first boosted voltage, while the power module 10 supplies energy to the second energy storage unit 31, the power module 10, the first energy supply unit 21 and the second energy supply unit 32 supply energy to the third energy storage unit 34 to secondarily boost the first boosted voltage to obtain a second boosted voltage, and simultaneously supply energy to the load R through the third energy supply unit 35. In the embodiment, the power supply voltage is boosted twice, so that the duty ratio can be reduced, and the reverse recovery loss and the switching loss of the output diode are further reduced.
Referring to fig. 2, fig. 2 is a schematic circuit diagram of a voltage conversion circuit according to a second embodiment of the present invention.
In the present embodiment, the first power supply unit 21 includes: first inductorSecond inductance->First diode->To the third diode->；
Wherein the first diodeIs +.>Is connected to the first terminal of said first diode +.>Is also connected to the direct current power supply +.>Is connected with the positive pole of the first diode +.>Is respectively associated with the cathode of the second diode +.>Is to be connected to the cathode of said first inductor +.>Is connected to the first terminal of said second diode +.>Is respectively associated with the anode of said second inductor +.>Is connected to the second terminal of said third diode +.>The anode of the third diode +.>Respectively with the cathode of said first inductor +.>Is connected to said first switching unit 23.
For ease of understanding, reference is made to fig. 3 and 4, where fig. 3 is a circuit diagram illustrating the operation of the second embodiment of the voltage conversion circuit according to the present invention in the first mode, and fig. 4 is a circuit diagram illustrating the operation of the second embodiment of the voltage conversion circuit according to the present invention in the second mode.
As shown in fig. 3, when the first switching unit 23 and the second switching unit 33 are in the first mode, the first switching unit 23 is turned on, and the second switching unit 33 is turned off, and the first diode is turned offAnd a third diode->Conduction, second diode->Turn-off, DC power supply->To the first inductance->And a second inductance->Providing energy, a first inductance->Is>The current of (c) increases.
As shown in fig. 4, when the first switching unit 23 and the second switching unit 33 are in the second mode, the first switching unit 23 is turned off, and the second switching is performedThe unit 33 is turned on, when the first diodeAnd a third diode->Turn off, second diode->Conduction, DC power supply->First inductor->And a second inductance->By means of a second diode->The first energy storage unit 22 is supplied with energy, the first inductance +.>Is>The current of (c) decreases.
Further, in the present embodiment, the first switching unit 23 includes: first switch tubeSecond switch tubeFourth diode->And a fifth diode->The method comprises the steps of carrying out a first treatment on the surface of the Wherein the fourth diode +.>The anode of which is respectively +.>Is connected to the cathode of the second switch tube>Is connected to the input terminal of said fourth diode +.>The cathodes of (2) are respectively connected with the first switch tube +.>Is connected to the first energy storage unit 22, the first switching tube +.>Respectively with the output of said fifth diode +.>Is +.>Is connected with the negative pole of the second switch tube->Is connected to the output of the first energy storage unit 22 and the fifth diode, respectively>Is connected to the anode of the battery.
It can be appreciated that the first switch tubeAnd a second switching tube->The transistor may be a MOS transistor or other switching transistors, and the embodiment is not limited. When the first switch tube is +>And a second switching tube->When they are in the on state, the circuit is in the first mode, and when the first switch tube is +.>And a second switching tube->When both are in the off state, the circuit is in the second mode.
Further, in the present embodiment, the first energy storage unit 22 includes: first capacitorThe method comprises the steps of carrying out a first treatment on the surface of the Wherein the first capacitance->Is +.>Is connected to the cathode of the first capacitor +.>Is connected to the second terminal of said fifth diode +.>Is connected to the anode of the battery.
It will be appreciated that as shown in FIG. 3, when the first switching tube is described aboveAnd a second switching tube->Fourth diode when conducting>And a fifth diode->Turn off, first capacitor->With DC power supply->A first inductance in the same direction>And a second inductance->Providing energy, a first inductance->Is>The current of (c) increases.
As shown in FIG. 4, when the first switch tube is in the first stateAnd a second switching tube->Fourth diode when disconnected->And a fifth diode->Conduction, DC power supply->First inductor->And a second inductance->By means of a second diode->Fourth diode->And a fifth diode->The first energy storage unit 22 is supplied with energy such that a direct current power supply is +.>The output voltage is boosted once to obtain a first boosted voltage.
Further, in the present embodiment, the second energy storage unit 31 includes: coupling inductor, sixth diodeAnd a seventh diode->；
Wherein the primary winding of the coupling inductanceIs identical to the homonymous terminal of said first diode +.>Is connected to the anode of the primary winding +.>Is connected to the other end of the sixth diode +.>The anode of the sixth diode +.>Is connected to the same-name end of the secondary winding of the coupled inductor, the other end of the secondary winding being connected to the second switching unit 33 and the seventh diode->The anode of the seventh diode +.>Is connected to said second energy supply unit 32.
It should be noted that the coupling inductor may include a primary windingAnd a first secondary winding->Wherein the primary winding->And the first secondary winding->The turns ratio therebetween is not limited in this embodiment.
It can be appreciated that as shown in FIG. 3, when the first switch tube is in the above-mentioned stateAnd a second switching tube->When conducting, sixth diode->And a seventh diode->On, the coupling inductance is via a sixth diode +.>Supplying energy to the second power supply unit, coupling the primary winding in the inductance +.>And a first secondary winding->The current of (c) decreases.
As shown in FIG. 4, when the first switch tube is in the first stateAnd a second switching tube->When off, sixth diode->And a seventh diode->Turn-off, coupling inductance receiving DC power supply +.>The energy supplied, the primary winding of the coupling inductance +.>Is>The current of (c) increases.
Further, in the present embodiment, the second switching unit 33 includes: third switch tube；
Wherein the third switching tubeIs connected to the input of the seventh diode +.>Is connected with the anode of the third switch tube +.>Is connected with the output terminal of the direct current power supply>Is connected to the negative electrode of the battery.
It will be appreciated that the third switch tubeThe transistor may be a MOS transistor, or may be other switching transistors, which is not limited in this embodiment. When the third switch tube is->When the switch is in the off state, the circuit is in the first mode, and when the third switch tube is +.>When in the on state, the circuit is in the second mode.
Further, in the present embodiment, the second power supply unit 32 includes: second capacitor；
Wherein the second capacitorIs connected to the first end of the second switching tube +.>Is connected to the input terminal of said second capacitor +.>Is associated with the seventh diode +.>Is connected to the third energy storage unit 34.
It should be noted that, as shown in fig. 3, when the first switch tube isAnd a second switching tube->On, third switch tube->When the switch is turned off, the coupling inductance passes through the sixth diode +.>To the second capacitor->Providing energy.
As shown in FIG. 4, when the first switch tube is in the first stateAnd a second switching tube->Disconnect, third switch tube->When conducting, DC power supply +.>First inductor->Second inductance->And a second capacitance->By means of a second diode->The third energy storage unit 34 is supplied with energy together so that the first boosted voltage is boosted twice to obtain the second boosted voltage.
Further, the third energy storage unit 34 includes: third capacitorEighth diode->And a ninth diode；
Wherein the third capacitorIs +.>The third capacitor is connected with the anodeIs respectively connected with the second end of the eighth diode +.>Is claimed and said ninth diode +.>The eighth diode +.>Is +.>Is connected to the cathode of the ninth diode +.>Is connected to the third energy supply unit 35 and to the first end of the load R, the second end of the load R and to the third switching tube->Is connected with the output end of the power supply.
It can be appreciated that as shown in FIG. 3, when the first switch tube is in the above-mentioned stateAnd a second switching tube->Conduction and third switch tubeWhen off, eighth diode->Turn-off, ninth diode->Conduction, third capacitance->The third energy supply unit 35 and the load R are supplied with energy.
As shown in FIG. 4, when the first switch tube is in the first stateAnd a second switching tube->Disconnect, third switch tube->When conducting, eighth diode->Conduction, ninth diode->Turn-off, DC power supply->First inductor->Second inductance->Second capacitor->By means of a second diode->And eighth diode->To the third capacitor->Providing energy to secondarily boost the first boosted voltage to obtain a second boosted voltage.
Further, in the present embodiment, the third power supply unit 35 includes: fourth capacitor；
Wherein the fourth capacitorIs equal to the first end of the ninth diode +.>The cathode of the fourth capacitor is connected withIs connected to a second end of the load R.
It will be appreciated that as shown in FIG. 3, when the first switching tube is described aboveAnd a second switching tube->Cut-off, third switch tubeWhen conducting, third capacitor->To fourth capacitance->And the load R provides energy.
As shown in FIG. 4, when the first switch tube is in the first stateAnd a second switching tube->Disconnect, third switch tube->Fourth capacitor when conducting>The energy is supplied directly to the load R.
Further, in the present embodiment, the voltage conversion circuit further includes: fifth capacitor；
Wherein the fifth capacitorIs +.>The anode of the fifth capacitorIs associated with the seventh diode +.>Is connected to the anode of the battery.
It should be noted that, as shown in fig. 3, when the first switch tube isAnd a second switching tube->Disconnect, third switch tube->When conducting, fifth capacitor->Can assist the coupling capacitor to the second capacitor>Providing energy.
As shown in FIG. 4, when the first switch tube is in the first stateAnd a second switching tube->Disconnect, third switch tube->When conducting, DC power supply +.>And primary winding->Can be about to the fifth capacitor>Providing energy.
Further, in the present embodiment, the voltage conversion circuit further includes: sixth capacitor；
Wherein the sixth capacitorIs +.>The cathode of the sixth capacitor is connected withIs connected to the second terminal of said fifth diode +.>Is connected to the cathode of the battery.
It will be appreciated thatAs shown in FIG. 3, when the first switch tubeAnd a second switching tube->Cut-off, third switch tubeWhen conducting, fifth capacitor->DC power supply->And primary winding->Can be +.>Providing energy.
As shown in FIG. 4, when the first switch tube is in the first stateAnd a second switching tube->Disconnect, third switch tube->When turned on, the sixth capacitor->Can be applied to the first secondary winding>Providing energy.
In a specific implementation, when the circuit is in the first mode, the DC power supplyAnd a first capacitance->For the first inductance->And a second inductance->Providing energy, coupling the inductor to the second capacitor +.>Providing energy, third capacitor->For the fourth capacitance->And the load R provides energy; when the circuit is in the second mode, the direct current power supply is +.>First inductor->And a second inductance->For the first capacitance->Providing energy to achieve a boost, DC power +.>Providing energy for the coupling inductance, direct current power supply +.>First inductor->Second inductance->And a second electricityCapacity->For the third capacitor->Providing energy so that a secondary boost is achieved while a fourth capacitance +.>Providing energy to the load R. Furthermore, the first switching tube can be controlled>Second switch tube->And a third switching tubeThe duty cycle of (2) to control the first switching tube +.>Second switch tube->And a third switching tube->To thereby increase the output voltage. It is also emphasized that the present embodiment can also be implemented by varying the primary winding of the coupling inductance +.>And a first secondary winding->The turn ratio between the two turns is used for further improving the voltage conversion ratio and avoiding the voltage conversion circuit from working under the condition of extreme duty ratio.
In order to facilitate understanding of the beneficial effects of the present embodiment, reference is made to fig. 5, and fig. 5 is a parameter variation diagram of a part of components of the voltage conversion circuit according to the present invention under a certain duty cycle.
As shown in fig. 5, when the voltage conversion circuit is in a steady state, it is assumed that the first switching tubeSecond switch tube->And a third switching tube->Is +.>First switch tube->And a second switching tube->Is +.>Third switch tube->Is +.>If->Then->，/>For the first switching tube->And a second switching tube->On-time of->For the third switching tube->Is set in the above-described state. />And->First switching tube>Voltage between gate and source of (c) and second switching tube +.>Is the voltage between the gate and the source, +.>For the third switching tube->Is the voltage between the gate and the source, +.>And->First switching tube>Voltage between drain and source of (d) and second switch tubeIs the voltage between the drain and the source, +.>For the third switching tube->Is the voltage between the drain and the source, +.>And->First inductances +.>And a second inductance->Current of->For primary winding->Current of->For the fourth capacitance->Is used for the voltage of the (c) transformer,for the starting moment of the cycle>For the end time of the first modality,/->Is the second modality end time.
In FIG. 5, when the first switching tubeAnd a second switching tube->On, third switch tube->When the circuit is disconnected, the circuit is in a first mode, and a first switch tube is +>Between drain and source of (c) and second switching tube->No voltage is applied between the drain and the source of (a) and (b) a third switching tube>A voltage exists between the drain electrode and the source electrode, and a first inductance is formed>And a second inductance->Energy storage, first inductance->Is>Is increased, primary winding->Releasing energy, primary winding->Is reduced, fourth capacitance->The voltage across it is constant. When the first switch tube->And the second switch end is disconnected, the third switch tube is +.>When the circuit is conducted, the circuit is in a second mode, and the first switch tube is +>Between drain and source of (c) and second switching tube->A voltage is present between the drain and the source of (a) a third switching tube +.>No voltage is applied between drain and source, the first inductance->And a second inductance->Releasing energy, the first inductance +.>Is>Is reduced, primary winding->Energy storage, primary winding->Is increased, fourth capacitance->The voltage across it is constant.
With reference to fig. 5, and assuming a primary windingAnd the first secondary winding->The turns ratio between them is 1 by +.>And the coupling inductance applies a second volt balance, the following relationship can be obtained in steady state:
wherein, the liquid crystal display device comprises a liquid crystal display device,is a direct current power supply->Voltage of>For the first capacitance->Voltage of>For the sixth capacitance->Voltage of>For the fifth capacitor->Is set in the above-described voltage range.
From the above formula (1), a first capacitance can be obtainedSixth capacitor->Fifth capacitor->Is, namely:
from the above (2), a second capacitance can be obtainedIs, namely:
wherein, the liquid crystal display device comprises a liquid crystal display device,for the second capacitor->Is set in the above-described voltage range.
From the above (3), a third capacitance can be obtainedIs, namely:
wherein, the liquid crystal display device comprises a liquid crystal display device,for the third capacitor->Is set in the above-described voltage range.
The output voltage is then obtained as:
wherein, the liquid crystal display device comprises a liquid crystal display device,is the output voltage.
The gain ratio of the input/output voltage obtained by the above equation (5) is:
wherein, the liquid crystal display device comprises a liquid crystal display device,is the output voltage gain ratio.
As can be seen from the above formula (6),and thus a larger voltage gain can be achieved with a smaller duty cycle.
The embodiment can control the first switch tubeSecond switch tube->And a third switching tube->The duty cycle of (2) to control the first switching tube +.>Second switch tube->And a third switching tube->And then secondary boost is realized, thereby realizing larger voltage gain through smaller duty ratio. At the same time, the embodiment can also be implemented by changing the primary winding of the coupling inductance +.>And a first secondary winding->The turn ratio between the two turns is used for further improving the voltage conversion ratio and avoiding the voltage conversion circuit from working under the condition of extreme duty ratio.
Furthermore, to achieve the above object, the present invention also proposes a voltage converter including the voltage conversion circuit shown above.
The voltage converter adopts all the technical schemes of all the embodiments, so that the voltage converter has at least all the beneficial effects brought by the technical schemes of the embodiments, and the description is omitted herein.
It should be understood that the foregoing is illustrative only and is not limiting, and that in specific applications, those skilled in the art may set the invention as desired, and the invention is not limited thereto.
It should be noted that the above-described working procedure is merely illustrative, and does not limit the scope of the present invention, and in practical application, a person skilled in the art may select part or all of them according to actual needs to achieve the purpose of the embodiment, which is not limited herein.
In addition, technical details not described in detail in the present embodiment may refer to the voltage conversion circuit provided in any embodiment of the present invention, and are not described herein.
Furthermore, it should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or system that comprises the element.
The foregoing embodiment numbers of the present invention are merely for the purpose of description, and do not represent the advantages or disadvantages of the embodiments.
The foregoing description is only of the preferred embodiments of the present invention, and is not intended to limit the scope of the invention, but rather is intended to cover any equivalents of the structures or equivalent processes disclosed herein or in the alternative, which may be employed directly or indirectly in other related arts.

Claims (12)

1. A voltage conversion circuit, characterized in that the voltage conversion circuit comprises: the system comprises a first boosting module and a second boosting module, wherein the first boosting module or the second boosting module is a BOOST boosting module;
the first boosting module is respectively connected with the power supply module and the second boosting module, and the second boosting module is respectively connected with the power supply module and the load;
the power supply module is used for transmitting the generated power supply voltage to the first boosting module and the second boosting module;
the first boosting module is used for boosting the power supply voltage once when receiving the power supply voltage output by the power supply module, obtaining a first boosted voltage and transmitting the first boosted voltage to the second boosting module;
the second boost module is used for secondarily boosting the first boost voltage to obtain a second boost voltage, and transmitting the second boost voltage to the load;
the first boost module includes: the first energy supply unit, the first energy storage unit and the first switching unit;
the first energy supply unit is respectively connected with the power supply module and the first switching unit, and the first switching unit is respectively connected with the second boosting module and the first energy storage unit;
the first energy supply unit is used for storing energy provided by the power supply module and the first energy storage unit when the first switching unit is in a first mode;
the first energy storage unit is used for storing energy provided by the power supply module and the first energy supply unit when the first switching unit is in a second mode so as to boost the power supply voltage once to obtain a first boosted voltage;
the second boost module includes: the device comprises a second energy storage unit, a second energy supply unit, a third energy storage unit, a third energy supply unit and a second switching unit;
the second energy storage unit is respectively connected with the power supply module and the second energy supply unit, the second energy supply unit is respectively connected with the third energy storage unit and the first energy supply unit, the third energy storage unit is connected with the third energy supply unit and the load, the third energy supply unit is also connected with the load, and the second switching unit is connected with the second energy storage unit;
the second energy supply unit is used for storing energy provided by the second energy storage unit when the second switching unit is in the first mode;
the third energy supply unit is used for storing energy provided by the third energy storage unit when the second switching unit is in the first mode;
the third energy storage unit is used for providing energy for the load when the second switching unit is in the first mode;
the second energy storage unit is used for storing energy provided by the power supply module when the second switching unit is in the second mode;
the third energy storage unit is used for storing energy provided by the power supply module, the first energy supply unit and the second energy supply unit when the second switching unit is in the second mode so as to secondarily boost the first boosted voltage to obtain a second boosted voltage;
the third energy supply unit is configured to supply energy to the load when the second switching unit is in the second mode.
2. The voltage conversion circuit of claim 1, wherein the first energy supply unit comprises: the first inductor, the second inductor, the first diode and the third diode;
the anode of the first diode is connected with the first end of the second inductor, the anode of the first diode is also connected with the positive electrode of the direct current power supply in the power supply module, the cathode of the first diode is respectively connected with the cathode of the second diode and the first end of the first inductor, the anode of the second diode is respectively connected with the second end of the second inductor and the anode of the third diode, and the cathode of the third diode is respectively connected with the second end of the first inductor and the first switching unit.
3. The voltage conversion circuit according to claim 2, wherein the first switching unit includes: the first switch tube, the second switch tube, the fourth diode and the fifth diode;
the anode of the fourth diode is connected with the cathode of the third diode and the input end of the second switching tube respectively, the cathode of the fourth diode is connected with the input end of the first switching tube and the first energy storage unit respectively, the output end of the first switching tube is connected with the cathode of the fifth diode and the cathode of the direct current power supply respectively, and the output end of the second switching tube is connected with the first energy storage unit and the anode of the fifth diode respectively.
4. The voltage conversion circuit of claim 3, wherein the first energy storage unit comprises: a first capacitor;
the first end of the first capacitor is connected with the cathode of the fourth diode, and the second end of the first capacitor is connected with the anode of the fifth diode.
5. The voltage conversion circuit of claim 3, wherein the second energy storage unit comprises: coupling the inductor, the sixth diode and the seventh diode;
the same-name end of the primary winding of the coupling inductor is connected with the anode of the first diode, the other end of the primary winding is connected with the anode of the sixth diode, the cathode of the sixth diode is connected with the same-name end of the secondary winding of the coupling inductor, the other end of the secondary winding is connected with the second switching unit and the anode of the seventh diode, and the cathode of the seventh diode is connected with the second energy supply unit.
6. The voltage conversion circuit according to claim 5, wherein the second switching unit includes: a third switching tube;
the input end of the third switching tube is connected with the anode of the seventh diode, and the output end of the third switching tube is connected with the cathode of the direct-current power supply.
7. The voltage conversion circuit of claim 6, wherein the second energy supply unit comprises: a second capacitor;
the first end of the second capacitor is connected with the input end of the second switching tube, and the second end of the second capacitor is connected with the cathode of the seventh diode and the third energy storage unit.
8. The voltage conversion circuit of claim 7, wherein the third energy storage unit comprises: a third capacitor, an eighth diode, and a ninth diode;
the first end of the third capacitor is connected with the anode of the seventh diode, the second end of the third capacitor is connected with the cathode of the eighth diode and the anode of the ninth diode respectively, the anode of the eighth diode is connected with the cathode of the seventh diode, the cathode of the ninth diode is connected with the third energy supply unit and the first end of the load respectively, and the second end of the load is connected with the output end of the third switch tube.
9. The voltage conversion circuit of claim 8, wherein the third power supply unit comprises: a fourth capacitor;
the first end of the fourth capacitor is connected with the cathode of the ninth diode, and the second end of the fourth capacitor is connected with the second end of the load.
10. The voltage conversion circuit according to any one of claims 5 to 9, characterized in that the voltage conversion circuit further comprises: a fifth capacitor;
the first end of the fifth capacitor is connected with the anode of the sixth diode, and the second end of the fifth capacitor is connected with the anode of the seventh diode.
11. The voltage conversion circuit of claim 10, wherein the voltage conversion circuit further comprises: a sixth capacitor;
the first end of the sixth capacitor is connected with the cathode of the sixth diode, and the second end of the sixth capacitor is connected with the cathode of the fifth diode.
12. A voltage converter, characterized in that it comprises a voltage conversion circuit according to any one of claims 1 to 11.
CN202310577747.2A 2023-05-22 2023-05-22 Voltage conversion circuit and voltage converter Active CN116317548B (en)

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CN204886697U (en) * 2015-07-09 2015-12-16 安徽明赫新能源有限公司 High -gain boost circuit
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WO2021108598A1 (en) * 2019-11-27 2021-06-03 Wayne State University Boost converter with automatic current balancing
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