CN112350604A - Resonant converter circuit and resonant converter - Google Patents

Resonant converter circuit and resonant converter Download PDF

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Publication number
CN112350604A
CN112350604A CN202011251153.5A CN202011251153A CN112350604A CN 112350604 A CN112350604 A CN 112350604A CN 202011251153 A CN202011251153 A CN 202011251153A CN 112350604 A CN112350604 A CN 112350604A
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China
Prior art keywords
resonant
switching tube
module
bridge arm
arm unit
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CN202011251153.5A
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Chinese (zh)
Inventor
张勇会
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Wuhan Magmett Electric Co ltd
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Wuhan Magmett Electric Co ltd
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Priority to CN202011251153.5A priority Critical patent/CN112350604A/en
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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
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/53—Conversion of dc power input into ac power output without possibility of reversal 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
    • H02M7/537—Conversion of dc power input into ac power output without possibility of reversal 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, e.g. single switched pulse inverters
    • H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal 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, e.g. single switched pulse inverters in a bridge configuration
    • 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
    • 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
    • H02M1/38—Means for preventing simultaneous conduction of switches
    • 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
    • H02M1/38—Means for preventing simultaneous conduction of switches
    • H02M1/385—Means for preventing simultaneous conduction of switches with means for correcting output voltage deviations introduced by the dead time
    • 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 embodiment of the invention discloses a resonant converter circuit and a resonant converter, wherein the resonant converter circuit comprises a first resonant conversion circuit and a second resonant conversion circuit, the first resonant conversion circuit comprises a first switch module and a first resonant cavity module, the first switch module is connected with the first resonant cavity module, the second resonant conversion circuit comprises a second switch module and a second resonant cavity module, the second switch module is connected with the second resonant cavity module, the control unit is respectively connected with the first switch module and the second switch module, the control unit is used for outputting a control signal to control the on-off state of the first switch module and the second switch module, the first coupling inductor is respectively connected with the first resonant cavity module and the second resonant cavity module, and the first coupling inductor is used for adjusting the current in the first resonant cavity module and the second resonant cavity module. By the mode, the current sharing control can be realized through a simpler hardware structure, and the cost is lower.

Description

Resonant converter circuit and resonant converter
Technical Field
The invention relates to the technical field of power electronics, in particular to a resonant converter circuit and a resonant converter.
Background
The phase-shifted full-bridge resonant converter has the advantages of wide input and output voltage range, large current output and the like, and is applied to the fields of vehicle-mounted power supplies, server power supplies, communication power supplies and the like.
In high-power application occasions, an output parallel technology is often adopted. Due to slight differences of manufacturing processes and modes of components, inconsistency is generated among the components, and meanwhile, due to the fact that parasitic parameters of a transformer and an inductor are complex, dispersity is inevitably generated among magnetic components. So that differences in parameters in the phase-shifted full-bridge parallel circuit are inevitable. This results in different current stresses experienced by the circuits in the resonant cavity in the full-bridge parallel circuit. In severe cases, the power device is damaged, and the circuit can not work normally.
The existing processing scheme is to realize the balanced control of the current of the circuit in the resonant cavity by changing the control signal of each switching tube in the phase-shifted full-bridge resonant converter, however, the mode needs to be controlled by software, the control is more complex, the realization difficulty is higher, and the cost is higher.
Disclosure of Invention
The embodiment of the invention mainly solves the technical problem of providing a resonant converter circuit and a resonant converter, which can realize current sharing control through a simpler hardware structure and have lower cost.
To achieve the above object, in a first aspect, the present invention provides a resonant converter circuit comprising:
the first resonant conversion circuit, the second resonant conversion circuit, the first coupling inductor and the control unit;
the first resonant conversion circuit comprises a first switch module and a first resonant cavity module, and the first switch module is connected with the first resonant cavity module;
the second resonant conversion circuit comprises a second switch module and a second resonant cavity module, and the second switch module is connected with the second resonant cavity module;
the control unit is respectively connected with the first switch module and the second switch module, and is used for outputting a control signal to control the switch states of the first switch module and the second switch module;
the first coupling inductor is connected to the first resonant cavity module and the second resonant cavity module, and the first coupling inductor is used for adjusting currents in the first resonant cavity module and the second resonant cavity module.
In an optional manner, the first coupling inductor includes a first winding and a second winding, the first winding is connected to the first resonant cavity module, and the second winding is connected to the second resonant cavity.
In an optional manner, the first switch module includes a first bridge arm unit and a second bridge arm unit, and the first bridge arm unit and the second bridge arm unit are connected in parallel;
the first resonant cavity module comprises a first resonant inductor and a first transformer;
the first end of the first resonant inductor is connected with the first bridge arm unit, the second end of the first resonant inductor is connected with the homonymous end of the first winding, the homonymous end of the primary winding of the first transformer is connected with the synonym end of the first winding, and the synonym end of the primary winding of the first transformer is connected with the second bridge arm unit.
In an optional mode, the first bridge arm unit includes a first switching tube and a second switching tube connected in series in the same direction, and the second bridge arm unit includes a third switching tube and a fourth switching tube;
the second end of the first switching tube is connected with the second end of the third switching tube, and the first end of the second switching tube is connected with the first end of the fourth switching tube;
a connection point between a first end of the first switching tube and a second end of the second switching tube is connected with a first end of the first resonant inductor, and a connection point between a first end of the third switching tube and a second end of the fourth switching tube is connected with a different name end of the primary winding of the first transformer;
the control end of the first switch tube, the control end of the second switch tube, the control end of the third switch tube and the control end of the fourth switch tube are all connected with the control unit.
In an optional manner, the second switch module includes a third bridge arm unit and a fourth bridge arm unit, and the third bridge arm unit and the fourth bridge arm unit are connected in parallel;
the second resonant cavity module comprises a second resonant inductor and a second transformer;
the first end of the second resonant inductor is connected with the third bridge arm unit, the second end of the first resonant inductor is connected with the synonym end of the first winding, the synonym end of the primary winding of the second transformer is connected with the synonym end of the first winding, and the synonym end of the primary winding of the second transformer is connected with the fourth bridge arm unit.
In an optional mode, the third bridge arm unit includes a fifth switching tube and a sixth switching tube connected in series in the same direction, and the second bridge arm unit includes a seventh switching tube and an eighth switching tube;
the second end of the fifth switching tube is connected with the second end of the seventh switching tube, and the first end of the sixth switching tube is connected with the first end of the fourth switching tube;
a connection point between the first end of the fifth switching tube and the second end of the sixth switching tube is connected with the first end of the second resonant inductor, and a connection point between the first end of the seventh switching tube and the second end of the eighth switching tube is connected with the synonym end of the primary winding of the second transformer;
and the control end of the fifth switching tube, the control end of the sixth switching tube, the control end of the seventh switching tube and the control end of the eighth switching tube are connected with the control unit.
In an optional manner, the first switch module further includes a first filter capacitor, and the second switch module further includes a second filter capacitor;
the first filter capacitor is connected with the first bridge arm unit in parallel, and the second filter capacitor is connected with the second bridge arm unit in parallel.
In an optional mode, the resonant converter circuit further comprises a third resonant conversion circuit and a second coupling inductor;
the third resonant conversion circuit includes:
the third switch module comprises a fifth bridge arm unit and a sixth bridge arm unit, and the fifth bridge arm unit and the sixth bridge arm unit are connected in parallel;
the third resonant cavity module is respectively connected with the fifth bridge arm unit and the sixth bridge arm unit;
the second coupling inductor is connected with the second resonant cavity module and the third resonant cavity module respectively.
In an alternative mode, the second coupling inductor comprises a third winding and a fourth winding;
the homonymous end of the third winding is connected with the first coupling inductor, and the heteronymous end of the third winding is connected with the second resonant cavity module;
and the homonymous end and the heteronymous end of the fourth winding are both connected with the third resonant cavity module.
In a second aspect, an embodiment of the present invention further provides a resonant converter, where the resonant converter includes a rectification module and the resonant converter circuit as described above, and the resonant converter circuit is connected to the rectification module;
the resonant converter circuit is used for performing voltage conversion on an input power supply;
the rectifying module is used for rectifying the input power after voltage conversion to provide power supply voltage for a load.
The embodiment of the invention has the beneficial effects that: the resonant converter circuit provided by the invention comprises a first resonant conversion circuit, a second resonant conversion circuit, a first coupling inductor and a control unit, wherein the first resonant conversion circuit comprises a first switch module and a first resonant cavity module, the second resonant conversion circuit comprises a second switch module and a second resonant cavity module, the first switch module is connected with the first resonant cavity module, the second switch module is connected with the second resonant cavity module, the control unit is respectively connected with the first switch module and the second switch module, and the first coupling inductor is respectively connected with the first resonant cavity module and the second resonant cavity module, therefore, as the first coupling inductor is arranged between the first resonant cavity module and the second resonant cavity module, when the current difference of the first resonant cavity module or the second resonant cavity module changes, the first coupling inductor can generate induced electromotive force to inhibit the change, therefore, the effect of current balance is realized, namely, the current sharing control is realized by adding the first coupling inductor which is a simpler hardware structure, and the required cost is lower.
Drawings
One or more embodiments are illustrated by way of example in the accompanying drawings, which correspond to the figures in which like reference numerals refer to similar elements and which are not to scale unless otherwise specified.
Fig. 1 is a schematic structural diagram of a resonant converter according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a resonant converter circuit according to an embodiment of the present invention;
fig. 3 is a schematic circuit diagram of a resonant converter circuit according to an embodiment of the present invention;
fig. 4 is a schematic waveform diagram of a PWM signal output by the control unit according to the embodiment of the present invention;
fig. 5 is a schematic circuit diagram of a resonant converter circuit according to another embodiment of the present invention;
fig. 6 is a schematic circuit diagram of a resonant converter circuit according to another embodiment of the present invention;
fig. 7 is a schematic structural diagram of a resonant converter circuit according to another embodiment of the present invention;
fig. 8 is a schematic circuit diagram of a resonant converter circuit according to another embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a resonant converter according to an embodiment of the present invention, as shown in fig. 1, a resonant converter 1000 includes a resonant converter circuit 100 and a rectifying circuit 200, wherein an input terminal of the resonant converter circuit 100 is connected to an external power source 300, an output terminal of the resonant converter circuit 100 is connected to an input terminal of the rectifying circuit 200, and an output terminal of the rectifying circuit 200 is connected to a load 400.
Specifically, when the external power source 300 is input to the resonant converter 1000, the resonant converter circuit 100 in the resonant converter 1000 can regulate, i.e., convert the voltage of the external power source 300 according to the switching state of each switching tube in the circuit, and input the voltage-converted external power source 300 to the rectifier circuit 200, the rectifier circuit 200 may be a full-bridge rectifier circuit or a half-bridge rectifier circuit, and the rectified external power source 300 can be used to provide the actual external load with the supply voltage, so the resonant converter 1000 can be applied to the fields of vehicle-mounted power sources, server power sources, communication power sources, and the like.
As shown in fig. 2, the resonant converter circuit 100 includes a first resonant conversion circuit 10, a second resonant conversion circuit 20, a first coupling inductor 30 and a control unit 40, the first resonant conversion circuit 10 includes a first switch module 11 and a first resonant cavity module 12, and the second resonant conversion circuit 20 includes a second switch module 21 and a second resonant cavity module 22.
The first switch module 11 is connected to the first resonant cavity module 12, the second switch module 21 is connected to the second resonant cavity module 22, the control unit 40 is connected to the first switch module 11 and the second switch module 21, and the first coupling inductor 30 is connected to the first resonant cavity module 12 and the second resonant cavity module 22.
Specifically, the control unit 40 can output a first control signal to control the switching state of each switching tube of the first switching module 11, and the control unit 40 can output a second control signal to control the switching state of each switching tube of the second switching module 21, so as to adjust the input power source connected to the resonant converter circuit 100, where the first control signal and the second control signal may be the same signal or different signals, for example, the duty ratios of the first control signal and the second control signal are the same, but the amplitudes corresponding to high levels in the signals are different, so as to drive different switching tubes.
The first coupling inductor 30 is used to adjust the current in the first resonant cavity module 12 or the current in the second resonant cavity module 22, and when all parameters of the first resonant conversion circuit 10 and the second resonant conversion circuit 20 are consistent, the currents flowing through the first resonant cavity module 12 and the second resonant cavity module 22 are also consistent, so that the voltage across the winding on the first coupling inductor 30 is not changed, and the first coupling inductor 30 is only equivalent to a wire at this time, and has no other additional influence on the circuit. When all parameters of the first resonant cavity module 12 and the second resonant cavity module 22 are not consistent or control signals input by the first resonant cavity module 12 and the second resonant cavity module 22 are not consistent, currents flowing through the first resonant cavity module 12 and the second resonant cavity module 22 are also different, so that a difference value of the currents between the first resonant cavity module 12 and the second resonant cavity module 22 sends a change, and the first coupling inductor 30 generates an induced electromotive force to suppress the change, so that an effect of current balance of the first resonant cavity module 12 and the second resonant cavity module 22 is achieved, that is, each switching tube of the first switching module 11 and each switching tube of the second switching module 21 can work at the same current level.
The circuit configuration of the resonant converter circuit shown in fig. 3 will be described as an example.
In an embodiment, as shown in fig. 3, the first switch module 11 includes a first bridge arm unit 111 and a second bridge arm unit 112, the first bridge arm unit 111 is connected in parallel with the second bridge arm unit 112, a resonant cavity of the first resonant conversion circuit 10 is defined between the first bridge arm unit 111 and the second bridge arm unit 112, and the first resonant cavity module 12 and the second resonant cavity module 22 are both disposed in the resonant cavity, where the first bridge arm unit 111 includes a first switch tube Q1, a second switch tube Q2, a third switch tube Q3 and a fourth switch tube Q4, and the second bridge arm unit 112 includes a fifth switch tube Q5, a sixth switch tube Q6, a seventh switch tube Q7 and an eighth switch tube Q8.
Specifically, the first switch tube Q1 is connected in series with the second switch tube Q2 in the same direction, the second end of the first switch tube Q1 is connected with the second end of the third switch tube Q3, and the first end of the first switch tube Q1 is connected with the second end of the second switch tube Q2; the third switching tube Q3 and the fourth switching tube Q4 are connected in series in the same direction, the first end of the third switching tube Q3 is connected with the second end of the fourth switching tube Q4, and the first end of the second switching tube Q2 is connected with the first end of the fourth switching tube Q4.
The fifth switching tube Q5 is connected in series with the sixth switching tube Q6 in the same direction, the second end of the fifth switching tube Q5 is connected with the second end of the seventh switching tube Q7, and the first end of the fifth switching tube Q5 is connected with the second end of the sixth switching tube Q6; the seventh switching tube Q7 is connected in series with the eighth switching tube Q8 in the same direction, the first end of the seventh switching tube Q7 is connected to the first end of the eighth switching tube Q8, and the first end of the sixth switching tube Q6 is connected to the first end of the eighth switching tube Q8.
Meanwhile, the control end of the first switch tube Q1, the control end of the second switch tube Q2, the control end of the third switch tube Q3, the control end of the fourth switch tube Q4, the control end of the fifth switch tube Q5, the control end of the sixth switch tube Q6, the control end of the seventh switch tube Q7 and the control end of the eighth switch tube Q8 are all connected to the control unit 40, and the control unit 40 outputs a control signal to control the switching state of each switch tube, where the switching state of each switch tube refers to the on state or the off state of each switch tube.
It should be understood that the first switch tube Q1, the second switch tube Q2, the third switch tube Q3, the fourth switch tube Q4, the fifth switch tube Q5, the sixth switch tube Q6, the seventh switch tube Q7, and the eighth switch tube Q8 may be any one of a triode, an MOS transistor, or an IGBT switch tube, and the first switch tube Q1, the second switch tube Q2, the third switch tube Q3, the fourth switch tube Q4, the fifth switch tube Q5, the sixth switch tube Q6, the seventh switch tube Q7, and the eighth switch tube Q8 may be all the same or different, for example, the first switch tube Q1, the second switch tube Q2, the third switch tube Q3, the fourth switch tube Q4, the fifth switch tube Q5, the sixth switch tube Q56, the seventh switch tube Q828653 may be an MOS transistor.
In the following embodiments, MOS transistors are used as the first switching transistor Q1, the second switching transistor Q2, the third switching transistor Q3, the fourth switching transistor Q4, the fifth switching transistor Q5, the sixth switching transistor Q6, the seventh switching transistor Q7, and the eighth switching transistor Q8.
Namely, the gate of the first MOS transistor Q1 is the control end of the first switch transistor Q1, the source of the first MOS transistor Q1 is the first end of the first switch transistor Q1, and the drain of the first MOS transistor Q1 is the second end of the first switch transistor Q1; for the second switch tube Q2, the third switch tube Q3, the fourth switch tube Q4, the fifth switch tube Q5, the sixth switch tube Q6, the seventh switch tube Q7 and the eighth switch tube Q8, the corresponding relationship of the pins when the MOS transistors are used as the switch tubes is similar to that of the first switch tube Q1, which is within the scope easily understood by those skilled in the art and will not be described herein again.
In one embodiment, the first coupling inductor L1 includes a first winding N1 and a second winding N2, the first winding N1 is connected to the first cavity module 12, and the second winding N2 is connected to the second cavity module 22.
Further, the first resonant cavity module 12 includes a first resonant inductor L2 and a first transformer T1, and then a connection point between the source of the first switching tube Q1 and the drain of the second switching tube Q2 is connected to a first end of the first resonant inductor L2, a second end of the first resonant inductor L2 is connected to a dotted end of the first winding N1, that is, the second end of the first resonant inductor L2 is connected to the 2 nd end of the first winding N1, and a different-dotted end of the first winding N1, that is, the 1 st end of the first winding N1 is connected to the dotted end of the primary winding T11 of the first transformer T1.
Optionally, the second resonant cavity module 22 includes a second resonant inductor L3 and a second transformer T2, then a connection point between the source of the fifth switching tube Q5 and the drain of the sixth switching tube Q6 is connected to the first end of the second resonant inductor L3, the second end of the second resonant inductor L3 is connected to the synonym end of the second winding N2, that is, the second end of the second resonant inductor L3 is connected to the 4 th end of the second winding N2, and the synonym end of the second winding N2, that is, the 3 rd end of the second winding N2 is connected to the synonym end of the primary winding T21 of the second transformer T2.
It can be understood that the end of the first coupling inductor L1, the transformer T1 or the transformer T2 with the small black dots in fig. 3 is the end with the same name, for example, the 2 nd end of the first winding N1 is the end with the same name; otherwise, the first winding N1 is a different-name terminal, for example, the 1 st terminal is a different-name terminal. Wherein, the homonymy end is the basis that electric current or electromotive force phase place between the mutual inductance coil are distinguished, and the homonymy end specifically refers to: when the two mutual inductors are electrified, the generated magnetic flux directions are the same, the current inflow ends of the two coils are named as homonymous ends (also called as homopolar ends), and the current inflow ends of the two coils are opposite to synonym ends.
Optionally, the first switch module 11 further includes a first filter capacitor C1, and the second switch module further includes a second filter capacitor C2, where the first filter capacitor C1 is connected 111 in parallel with the first bridge arm unit, and the second filter capacitor C2 is connected 112 in parallel, that is, one end of the first filter capacitor C1 is connected to the drain of the first MOS transistor Q1, the other end of the first filter capacitor C1 is connected to the source of the second MOS transistor Q2, one end of the second filter capacitor C2 is connected to the drain of the fifth MOS transistor, and the other end of the second filter capacitor C2 is connected to the source of the sixth MOS transistor Q6.
In practical applications, the input signals of the first MOS transistor Q1 and the fifth MOS transistor Q5 are the same PWM signal, denoted as PWMA, the input signals of the second MOS transistor Q2 and the sixth MOS transistor Q6 are the same PWM signal, denoted as PWMB, the input signals of the third MOS transistor Q3 and the seventh MOS transistor Q7 are the same PWM signal, denoted as PWMC, the input signals of the fourth MOS transistor Q4 and the eighth MOS transistor Q8 are the same PWM signal, denoted as PWMD, the PWM waves with dead zone complementary to each other are PWMA and PWMB, and the PWM waves with dead zone complementary to each other are PWMC and PWMD. It is assumed that the waveforms PWM1b and PWM2b shown in fig. 4 are PWM waves complementary to each other with dead zones, and the waveform of PWMA is PWM1b, and the waveform of PWMB is PWM2b, that is, during the time period T1, although the second switching transistor Q2 or the sixth MOS transistor Q6 is turned off due to the low level of the waveform of PWM2b, the first switching transistor Q1 or the fifth MOS transistor Q5 is not turned on immediately, but turned on after the time period T1. Similarly, during the time period T2, although the first switch Q1 is turned off due to the PWM1b waveform being low, the second switch Q2 is not turned on immediately, but turned on after the time period T2. Through the above manner, the second switch tube Q2 or the sixth MOS tube Q6 can be turned on only after the first switch tube Q1 or the fifth MOS tube Q5 is completely and fully turned off, so that various abnormal conditions such as simultaneous conduction of the first switch tube Q1 and the second switch tube Q2 are prevented. It should be understood that the time period T1 or the time period T2 may be set according to actual requirements, and is not limited herein.
The input power supply 300 is connected to the input terminal of the resonant converter circuit through a V + pin and a V-pin, and then the control unit 40 outputs a PWMA signal, a PWMB signal, a PWMC signal, and a PWMD signal to control each switching tube, thereby implementing a regulation process for the input power supply 300, at this time, a current in the first resonant cavity module 12 is IL2, and a current direction thereof flows from the first resonant inductor L2 to the first winding N1; the current at the second cavity module 22 is IL3, and its current direction flows from the second resonant inductor L3 to the second winding N2.
Therefore, if the first coupling inductor L1 is selected to have a winding turns ratio of 1:1, the first winding N1 and the second winding N2 are wound on the same core. Then, when the current IL2 emits a change, the magnetic flux generated by the current also changes, and because of the magnetic connection between the first winding N1 and the second winding N2, the current IL2 flowing through the first winding N1 generates an induced electromotive force on the second winding N2, and similarly, the current IL3 flowing through the second winding N2 generates an induced electromotive force on the first winding N1.
Due to the inductance L of the first winding N1N1Inductance L with the second winding N2N2Is equal, the coupling coefficient is 1, the voltage V between the two ends (the 1 st end and the 2 nd end) of the first winding N1N1And a voltage V between the two terminals (terminal 3 and terminal 4) of the second winding N2N2The following relationship is satisfied:
Figure BDA0002771650850000101
as can be seen from the above equation, if all the corresponding parameters of the first resonant conversion circuit 10 and the second resonant conversion circuit 20 are identical, the current IL2 becomes the current IL3, and V can be obtainedN1＝VN2When the voltage across the first winding N1 and the second winding N2 is 0, the first coupling inductor L1 is equivalent to a wire and has no influence on the circuit.
If some or all of the parameters of the first resonant conversion circuit 10 and the second resonant conversion circuit 20 are different, the current IL2 ≠ current IL3, i.e. the difference between the current in the cavity of the first resonant conversion circuit 10 and the current in the cavity of the second resonant conversion circuit 20 varies due to VN1And VN2The voltages are not all 0, that is, the first winding N1 and the second winding N2 generate induced electromotive forces to suppress the above changes, so that the current in the resonant cavity of the first resonant transformation circuit 10 and the current in the resonant cavity of the second resonant transformation circuit 20 are balanced, and the switching tubes and the rectifying circuit 200 in the resonant converter circuit 100 all operate at the same current level. For example, assuming that the voltage across the first filter capacitor C1 is 450V, the voltage across the second filter capacitor C2 is 400V, the voltage output by the resonant converter circuit 100 is 27.5V, the current output by the resonant converter circuit is 275A, and the total power is 7.5KW, for this circuit, if the first coupling inductor L1 is connected, the error of the deviation between the current in the cavity of the first resonant conversion circuit 10 and the current in the cavity of the second resonant conversion circuit 20 is less than 1%, that is, the current in the cavity of the first resonant conversion circuit 10 and the current in the cavity of the second resonant conversion circuit 20 are substantially the same; if the first coupling inductor L1 is not connected, the error of the deviation between the current in the resonant cavity of the first resonant conversion circuit 10 and the current in the resonant cavity of the second resonant conversion circuit 20 exceeds 60%, which may cause the power device to be damaged, so that the resonant converter circuit 100 may not operate normally.
In another embodiment, different input power sources may be used for the first resonant converting circuit 10 and the second resonant converting circuit 20, as shown in fig. 5, the first input power source is connected to the first resonant converting circuit 10 through V1+ and V1-, and the second input power source is connected to the first resonant converting circuit 20 through V2+ and V2-.
In another embodiment, the first resonant conversion circuit 10 and the second resonant conversion circuit 20 may be supplied with power by the same bus, and as shown in fig. 6, the input power may be connected to the first resonant conversion circuit 10 and the first resonant conversion circuit 20 via V + and V-.
It is understood that the control schemes adopted by the circuits shown in fig. 5 or fig. 6 are the same as those of the circuit shown in fig. 3, which are within the scope easily understood by those skilled in the art and are not described herein again.
Optionally, as shown in fig. 7, the resonant converter circuit 100 further includes a third resonant conversion circuit 50 and a second coupling inductor 60, or may further include a fourth resonant conversion circuit and a third coupling inductor … …, that is, the resonant converter circuit 100 may further include an nth resonant conversion circuit and a kth coupling inductor, where the nth resonant conversion circuit includes an nth switch module and an nth resonant cavity module, where N and K are positive integers, and it is understood that when N is 2 and K is 1, the technical solution shown in fig. 3, 5, or 6 is adopted.
The resonant converter circuit 100 further includes a third resonant conversion circuit 50 and a second coupling inductor 60.
Referring to fig. 8, the third resonant conversion circuit 50 includes a third switching module 51 and a third resonant cavity module 52, where the third switching module 51 includes a fifth bridge arm unit and a sixth bridge arm unit, the fifth bridge arm unit and the sixth bridge arm unit are connected in parallel, the third resonant cavity module 52 includes a third resonant inductor L4 and a third transformer T3, the third resonant cavity module 5 is connected to the fifth bridge arm unit and the sixth bridge arm unit, and the second coupling inductor is connected to the second resonant cavity module and the third resonant cavity module, respectively.
Specifically, the first bridge arm unit includes a ninth switching tube Q9 and a tenth switching tube Q10, the second bridge arm unit includes an eleventh switching tube Q11 and a twelfth switching tube Q12, and the second coupling inductor L5 includes a third winding N3 and a fourth winding N4. A connection point between the source of the ninth switching tube Q9 and the drain of the tenth switching tube Q10 is connected to a first end of a third resonant inductor L4, a second end of the third resonant inductor L4 is connected to a different-name end of a fourth winding N4 (end 8 of the fourth winding N4), a same-name end of a fourth winding N4 (end 7 of the fourth winding N4) is connected to a same-name end of the primary winding of the third transformer T3, a same-name end of a third winding N3 (end 6 of the third winding N3) is connected to end 3 of the second winding N2, and a different-name end of the third winding N3 (end 5 of the third winding N3) is connected to a same-name end of the primary winding of the second transformer T2.
Based on the above analysis process, the first input power is connected to the first resonant converting circuit 10 through the V1+ port and the V1-port, the second input power is connected to the second resonant converting circuit 20 through the V2+ port and the V2-port, the first input power is connected to the third resonant converting circuit 50 through the V3+ port and the V3-port, and if all parameters of the first resonant converting circuit 10, the second resonant converting circuit 20, and the third resonant converting circuit 50 are consistent, both the first coupling inductor L1 and the second coupling inductor L5 can be used as wires, and have no influence on the circuit.
If the parameters of the first resonant conversion circuit 10 and the second resonant conversion circuit 20 are partially or completely inconsistent or the duty ratios of the input control signals of the switching tubes of the first resonant conversion circuit 10 and the second resonant conversion circuit 20 are inconsistent, at this time, the currents of the first resonant conversion circuit 10 and the second resonant conversion circuit 20 are also different, then the first coupling inductor L1 generates a back electromotive force to realize the current sharing of the first resonant conversion circuit 10 and the second resonant conversion circuit 20; similarly, if the parameters of the second resonant conversion circuit 20 and the third resonant conversion circuit 50 are partially or completely inconsistent or the duty ratios of the input control signals of the switching tubes of the third resonant conversion circuit 50 and the input control signals of the switching tubes of the second resonant conversion circuit 20 are inconsistent, and at this time, the currents of the third resonant conversion circuit 50 and the second resonant conversion circuit 20 are also different, the second coupling inductor L5 generates the back electromotive force to realize the current sharing between the third resonant conversion circuit 50 and the second resonant conversion circuit 20.
It should be noted that, for the circuit shown in fig. 8, a third resonant conversion circuit and a second coupling inductor are added to the circuit shown in fig. 5, and therefore, the circuit shown in fig. 3 or fig. 6 may also have a similar modification to that shown in fig. 8, which is within the scope easily understood by those skilled in the art and is not described herein again.
The resonant converter circuit 100 provided by the present invention at least comprises a first resonant conversion circuit 10, a second resonant conversion circuit 20, a first coupling inductor 30 and a control unit 40, wherein the first resonant conversion circuit 10 comprises a first switch module 11 and a first resonant cavity module 12, the second resonant conversion circuit 20 comprises a second switch module 21 and a second resonant cavity module 22, wherein the first switch module 11 is connected with the first resonant cavity module 12, the second switch module 21 is connected with the second resonant cavity module 22, the control unit 40 is respectively connected with the first switch module 11 and the second switch module 21, the first coupling inductor 30 is respectively connected with the first resonant cavity module 12 and the second resonant cavity module 22, therefore, since the first coupling inductor 30 is arranged between the first resonant cavity module 12 and the second resonant cavity module 22, when the current difference of the first resonant cavity module 12 or the second resonant cavity module 22 changes, the first coupling inductor 30 can generate induced electromotive force to suppress such variation, so as to achieve the effect of current balancing, that is, the current sharing control is achieved by adding the first coupling inductor 30, which is a simpler hardware structure, and the required cost is lower.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; within the idea of the invention, also technical features in the above embodiments or in different embodiments may be combined, steps may be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.

Claims (10)

1. A resonant converter circuit, comprising:
the first resonant conversion circuit, the second resonant conversion circuit, the first coupling inductor and the control unit;
the first resonant conversion circuit comprises a first switch module and a first resonant cavity module, and the first switch module is connected with the first resonant cavity module;
the second resonant conversion circuit comprises a second switch module and a second resonant cavity module, and the second switch module is connected with the second resonant cavity module;
the control unit is respectively connected with the first switch module and the second switch module, and is used for outputting a control signal to control the switch states of the first switch module and the second switch module;
the first coupling inductor is connected to the first resonant cavity module and the second resonant cavity module, and the first coupling inductor is used for adjusting currents in the first resonant cavity module and the second resonant cavity module.
2. The resonant converter circuit of claim 1,
the first coupling inductor comprises a first winding and a second winding, the first winding is connected with the first resonant cavity module, and the second winding is connected with the second resonant cavity.
3. The resonant converter circuit of claim 2,
the first switch module comprises a first bridge arm unit and a second bridge arm unit, and the first bridge arm unit and the second bridge arm unit are connected in parallel;
the first resonant cavity module comprises a first resonant inductor and a first transformer;
the first end of the first resonant inductor is connected with the first bridge arm unit, the second end of the first resonant inductor is connected with the homonymous end of the first winding, the homonymous end of the primary winding of the first transformer is connected with the synonym end of the first winding, and the synonym end of the primary winding of the first transformer is connected with the second bridge arm unit.
4. The resonant converter circuit of claim 3,
the first bridge arm unit comprises a first switching tube and a second switching tube which are connected in series in the same direction, and the second bridge arm unit comprises a third switching tube and a fourth switching tube;
the second end of the first switching tube is connected with the second end of the third switching tube, and the first end of the second switching tube is connected with the first end of the fourth switching tube;
a connection point between a first end of the first switching tube and a second end of the second switching tube is connected with a first end of the first resonant inductor, and a connection point between a first end of the third switching tube and a second end of the fourth switching tube is connected with a different name end of the primary winding of the first transformer;
the control end of the first switch tube, the control end of the second switch tube, the control end of the third switch tube and the control end of the fourth switch tube are all connected with the control unit.
5. The resonant converter circuit of claim 2,
the second switch module comprises a third bridge arm unit and a fourth bridge arm unit, and the third bridge arm unit and the fourth bridge arm unit are connected in parallel;
the second resonant cavity module comprises a second resonant inductor and a second transformer;
the first end of the second resonant inductor is connected with the third bridge arm unit, the second end of the first resonant inductor is connected with the synonym end of the first winding, the synonym end of the primary winding of the second transformer is connected with the synonym end of the first winding, and the synonym end of the primary winding of the second transformer is connected with the fourth bridge arm unit.
6. The resonant converter circuit of claim 5,
the third bridge arm unit comprises a fifth switching tube and a sixth switching tube which are connected in series in the same direction, and the second bridge arm unit comprises a seventh switching tube and an eighth switching tube;
the second end of the fifth switching tube is connected with the second end of the seventh switching tube, and the first end of the sixth switching tube is connected with the first end of the fourth switching tube;
a connection point between the first end of the fifth switching tube and the second end of the sixth switching tube is connected with the first end of the second resonant inductor, and a connection point between the first end of the seventh switching tube and the second end of the eighth switching tube is connected with the synonym end of the primary winding of the second transformer;
and the control end of the fifth switching tube, the control end of the sixth switching tube, the control end of the seventh switching tube and the control end of the eighth switching tube are connected with the control unit.
7. The resonant converter circuit of any one of claims 1-6,
the first switch module further comprises a first filter capacitor, and the second switch module further comprises a second filter capacitor;
the first filter capacitor is connected with the first bridge arm unit in parallel, and the second filter capacitor is connected with the second bridge arm unit in parallel.
8. The resonant converter circuit of any one of claims 1-6,
the resonant converter circuit further comprises a third resonant conversion circuit and a second coupling inductor;
the third resonant conversion circuit includes:
the third switch module comprises a fifth bridge arm unit and a sixth bridge arm unit, and the fifth bridge arm unit and the sixth bridge arm unit are connected in parallel;
the third resonant cavity module is respectively connected with the fifth bridge arm unit and the sixth bridge arm unit;
the second coupling inductor is connected with the second resonant cavity module and the third resonant cavity module respectively.
9. The resonant converter circuit of claim 8,
the second coupling inductor comprises a third winding and a fourth winding;
the homonymous end of the third winding is connected with the first coupling inductor, and the heteronymous end of the third winding is connected with the second resonant cavity module;
and the homonymous end and the heteronymous end of the fourth winding are both connected with the third resonant cavity module.
10. A resonant converter, characterized in that the resonant converter comprises a rectifying module and a resonant converter circuit according to any of claims 1-9, the resonant converter circuit being connected to the rectifying module;
the resonant converter circuit is used for performing voltage conversion on an input power supply;
the rectifying module is used for rectifying the input power after voltage conversion to provide power supply voltage for a load.
CN202011251153.5A 2020-11-11 2020-11-11 Resonant converter circuit and resonant converter Pending CN112350604A (en)

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Application Number Priority Date Filing Date Title
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113285611A (en) * 2021-06-30 2021-08-20 上海空间电源研究所 Bidirectional multiport converter for multi-energy internet
CN114825962A (en) * 2022-04-28 2022-07-29 广东首航智慧新能源科技有限公司 Multi-channel resonant circuit and resonant converter

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113285611A (en) * 2021-06-30 2021-08-20 上海空间电源研究所 Bidirectional multiport converter for multi-energy internet
CN114825962A (en) * 2022-04-28 2022-07-29 广东首航智慧新能源科技有限公司 Multi-channel resonant circuit and resonant converter
US11942872B2 (en) 2022-04-28 2024-03-26 Guangdong Sofar Smart Solar Technology Co., Ltd. Multi-PATH resonant circuit and resonant converter

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