CN114448276B - AC-DC conversion circuit and method based on resonant full bridge - Google Patents

AC-DC conversion circuit and method based on resonant full bridge Download PDF

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Publication number
CN114448276B
CN114448276B CN202210362827.1A CN202210362827A CN114448276B CN 114448276 B CN114448276 B CN 114448276B CN 202210362827 A CN202210362827 A CN 202210362827A CN 114448276 B CN114448276 B CN 114448276B
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circuit
output
voltage signal
signal
connecting end
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CN114448276A (en
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杨帅
东伟
盛琳
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Meraki Integrated Shenzhen Technology Co ltd
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Meraki Integrated Shenzhen Technology Co ltd
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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
    • H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
    • H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
    • H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/21—Conversion of ac power input into dc 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
    • H02M7/217—Conversion of ac power input into dc 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
    • H02M7/219—Conversion of ac power input into dc 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 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
    • H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
    • H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
    • 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
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
    • 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

An AC-DC conversion circuit based on a resonance full bridge and a method thereof firstly obtain an AC voltage signal, a resonance voltage signal and an output voltage signal. The alternating current voltage signal is obtained by monitoring an instant voltage signal of alternating current input into the alternating current-direct current conversion circuit, the resonance voltage signal is obtained by monitoring instant voltage signals at two ends of a resonance capacitor Cr of the resonance circuit of the alternating current-direct current conversion circuit, and the output voltage signal is obtained by monitoring a direct current voltage signal output by the alternating current-direct current conversion circuit. Then acquiring a first driving electric signal according to the alternating voltage signal, the resonance voltage signal and the output voltage signal; and finally, acquiring a first switch driving electric signal for driving a power switch tube of the alternating current-direct current conversion circuit according to the first driving electric signal. Because the function of the high power factor rectifier is replaced by the closed-loop control of the relation among the alternating voltage signal, the resonance voltage signal and the output voltage signal, the alternating current-direct current conversion circuit is simplified and the energy loss of the alternating current-direct current conversion circuit is reduced.

Description

AC-DC conversion circuit and method based on resonant full bridge
Technical Field
The invention relates to the technical field of alternating current and direct current conversion, in particular to an alternating current-direct current conversion circuit and method based on a resonant full bridge.
Background
With the rapid development of power electronic technology, people have increasingly higher demands on various electronic products and also have increasingly higher demands on direct current power supplies. In the prior art, medium and small power off-line switching power supplies all include a BOOST-based power factor correction circuit and a high-frequency resonant half-bridge conversion circuit, and the two circuits respectively and independently work to respectively realize corresponding functions. In practical applications, it is desirable to simplify the ac-dc conversion circuit to reduce the cost and product size of the switching power supply, such as a medium-low power charger, a USBPD, etc.
Disclosure of Invention
The technical problem that this application mainly solved is how to simplify alternating current-direct current conversion circuit to realize reducing switching power supply's cost and product volume's technical problem.
According to a first aspect, an embodiment provides an ac-dc conversion circuit based on a resonant full bridge, which includes a rectifier bridge circuit, a full bridge rectifier circuit, a resonant circuit, a transformer circuit, an output circuit, a full bridge driving circuit, a driving control circuit, an ac voltage monitoring circuit, a resonant voltage monitoring circuit, and an output voltage monitoring circuit;
the rectifier bridge circuit is used for rectifying an alternating current into a first direct current and comprises an alternating current positive input end, an alternating current negative input end, a direct current positive output end and a direct current negative output end; the alternating current positive input end and the alternating current negative input end are used for inputting the alternating current, and the direct current positive output end and the direct current negative output end are used for outputting the first direct current;
The full-bridge rectification circuit comprises a direct current positive input end, a direct current negative input end, a rectification positive output end and a rectification negative output end; the direct-current positive input end and the direct-current negative input end are respectively connected with the direct-current positive output end and the direct-current negative output end, and the rectification positive output end and the rectification negative output end are connected with the resonant circuit; the full-bridge rectification circuit is used for performing full-bridge rectification on the first direct current and outputting the first direct current to the resonance circuit;
the resonant circuit comprises a rectification positive connecting end, a rectification negative connecting end, a primary side positive connecting end and a primary side negative connecting end; the rectification positive connecting end and the rectification negative connecting end are respectively connected with the rectification positive output end and the rectification negative output end, and the primary side positive connecting end and the primary side negative connecting end are used for being connected with the transformation circuit;
the transformation circuit comprises a first primary side connecting end, a second primary side connecting end, a first secondary side positive connecting end, a first secondary side negative connecting end, a second secondary side positive connecting end and a second secondary side negative connecting end; the first primary side connecting end and the second primary side connecting end are respectively connected with the primary side positive connecting end and the primary side negative connecting end; the first secondary positive connecting end, the first secondary negative connecting end, the second secondary positive connecting end and the second secondary negative connecting end are used for being connected with the output circuit;
The output circuit comprises a first input connecting end, a second input connecting end, a third input connecting end, a fourth input connecting end, an output positive connecting end and an output negative connecting end; the first input connection end and the second input connection end are respectively connected with the first secondary positive connection end and the first secondary negative connection end, and the third input connection end and the fourth input connection end are respectively connected with the second secondary positive connection end and the second secondary negative connection end; the output positive connecting end and the output negative connecting end of the output circuit are used for outputting second direct current;
the full-bridge driving circuit is respectively connected with the driving control circuit and the power switch tube of the full-bridge rectifying circuit and is used for responding to a first driving electric signal output by the driving control circuit and outputting a first switch driving electric signal to the power switch tube of the full-bridge rectifying circuit;
the alternating current voltage monitoring circuit is connected with the alternating current positive input end and the alternating current negative input end and is used for monitoring an instant voltage signal of the alternating current and sending the alternating current voltage signal obtained by monitoring the alternating current to the drive control circuit;
the resonance voltage monitoring circuit is connected with a resonance capacitor Cr of the resonance circuit and is used for monitoring instant voltage signals at two ends of the resonance capacitor Cr and sending resonance voltage signals obtained by monitoring the resonance capacitor Cr to the drive control circuit;
The output voltage monitoring circuit is connected with the output positive connecting end of the output circuit and used for monitoring the voltage signal of the second direct current and sending the output voltage signal obtained by monitoring the second direct current to the drive control circuit;
the driving control circuit is used for outputting the first driving electric signal according to the alternating voltage signal, the resonance voltage signal and the output voltage signal.
In one embodiment, the rectifier bridge circuit includes a diode D1, a diode D2, a diode D3, and a diode D4;
and/or the full-bridge rectification circuit comprises a first power switch tube S1, a second power switch tube S2, a third power switch tube S3 and a fourth power switch tube S4; a collector of the first power switch tube S1 is connected to the dc positive input terminal, an emitter of the first power switch tube S1 is connected to the rectifying positive output terminal, and a control electrode of the first power switch tube S1 is connected to the full bridge driving circuit; a collector of the second power switch tube S2 is connected to the rectifying positive output terminal, an emitter of the second power switch tube S2 is connected to the dc negative input terminal, and a control electrode of the second power switch tube S2 is connected to the full bridge driving circuit; a collector of the third power switch tube S3 is connected to the dc positive input terminal, an emitter of the third power switch tube S3 is connected to the rectified negative output terminal, and a control electrode of the third power switch tube S3 is connected to the full bridge driving circuit; a collector of a fourth power switch tube S4 is connected to the rectified negative output terminal, an emitter of the fourth power switch tube S4 is connected to the dc negative input terminal, and a control electrode of the fourth power switch tube S4 is connected to the full bridge driving circuit;
And/or, the resonant circuit further comprises an inductance Lr; one end of the inductor Lr is connected with the rectifying positive connecting end, and the other end of the inductor Lr is connected with the primary side positive connecting end; one end of the resonant capacitor Cr is connected with the rectification negative connection end, and the other end of the resonant capacitor Cr is connected with the primary side negative connection end;
and/or, the transformer circuit comprises a transformer Tr2, the transformer Tr2 comprises a primary side inductor and two secondary side inductors; one end of the primary side inductor is connected with the first primary side connecting end, the other end of the primary side inductor is connected with the second primary side connecting end, two ends of one secondary side inductor are respectively connected with the first secondary side positive connecting end and the first secondary side negative connecting end, and two ends of the other secondary side inductor are respectively connected with the second secondary side positive connecting end and the second secondary side negative connecting end;
and/or the output circuit comprises a diode D11, a diode D12, a capacitor C11, a resistor R11 and a resistor R12; the anode of the diode D11 is connected with the first input connection end of the output circuit, and the cathode of the diode D11 is connected with the output positive connection end of the output circuit; the anode of the diode D12 is connected with the fourth input connecting end of the output circuit, and the cathode of the diode D12 is connected with the output positive connecting end of the output circuit; the capacitor C11 is connected with the resistor R11 in series, one end of the series connection is connected with the output positive connecting end of the output circuit, and the other end of the series connection is connected with the output negative connecting end of the output circuit; one end of the resistor R12 is connected with the output positive connecting end of the output circuit, and the other end of the resistor R12 is connected with the output negative connecting end of the output circuit; and the second input connecting end, the third input connecting end and the output negative connecting end of the output circuit are electrically connected.
In one embodiment, the driving control circuit comprises an envelope acquisition circuit and a bangbang control circuit;
the envelope line acquisition circuit is used for multiplying the output voltage signal by the alternating-current voltage signal to acquire a sine wave envelope line signal and sending the acquired sine wave envelope line signal to the bangbang control circuit;
the bangbang control circuit is used for acquiring the sine wave envelope signal and the resonance voltage signal, acquiring the first driving electric signal according to the sine wave envelope signal and the resonance voltage signal, and outputting the first driving electric signal to the full-bridge driving circuit.
In one embodiment, the envelope acquisition circuit comprises an output voltage monitoring connection end, an alternating voltage monitoring connection end, a preset digital signal input end, a first gain circuit, an absolute value acquisition circuit, a multiplier, an analog-to-digital converter, a digital signal subtracter and a proportional-integral controller;
the output voltage monitoring connection end is connected with the output voltage monitoring circuit and is used for inputting the output voltage signal;
the alternating voltage monitoring connection end is connected with the alternating voltage monitoring circuit and is used for inputting the alternating voltage signal;
The preset digital signal input end is used for inputting a preset numerical value electric signal;
the analog-to-digital converter is respectively connected with the output voltage monitoring connection end and the digital signal subtracter, and is used for converting the output voltage signal into an output voltage digital signal and sending the output voltage digital signal to the digital signal subtracter;
the digital signal subtracter comprises a positive input end, a negative input end and a result output end; the positive input end of the digital signal subtracter is connected with the preset digital signal input end and is used for inputting the preset numerical value electric signal; the negative input end of the digital signal subtracter is connected with the analog-to-digital converter and is used for inputting the output voltage digital signal; the result output end of the digital signal subtracter is connected with the proportional-integral controller;
the proportional integral controllers are respectively connected with the multipliers; the proportional-integral controller is used for stabilizing voltage when the output voltage signal is subjected to closed-loop control;
the first gain circuit is respectively connected with the alternating voltage monitoring connection end and the absolute value acquisition circuit, and is used for transmitting the alternating voltage signal to the absolute value acquisition circuit after gain compensation;
The absolute value acquisition circuit is connected with the multiplier and is used for taking an absolute value of the alternating voltage signal after gain compensation and outputting the alternating voltage signal after the absolute value is taken to the multiplier;
the multiplier comprises two input ends and a multiplication result output end, and the multiplication result output end of the multiplier is connected with the bangbang control circuit; one input end of the multiplier is connected with the proportional-integral controller, and the other input end of the multiplier is connected with the absolute value acquisition circuit; the multiplier is used for multiplying the alternating voltage signal output by the absolute value acquisition circuit and the electric signal output by the proportional-integral controller, and sending the sine wave envelope signal acquired by multiplication to the bangbang control circuit.
In one embodiment, the bangbang control circuit comprises a resonant voltage monitoring connection terminal, an envelope signal connection terminal, a preset parameter input terminal, a second gain circuit, a first adder, a first subtracter, a first comparator, a second comparator and an SR trigger;
the resonance voltage monitoring connection end is connected with the resonance voltage monitoring circuit and is used for inputting the resonance voltage signal;
The envelope signal connecting end is connected with the envelope line acquisition circuit and is used for inputting the sine wave envelope line signal;
the preset parameter input end is used for inputting a preset first preset parameter electric signal;
the second gain circuit is respectively connected with the resonant voltage monitoring connection end, the first comparator and the second comparator; the second gain circuit is used for performing gain compensation on the resonance voltage signal and sending the resonance voltage signal after the gain compensation to the first comparator and the second comparator;
the first adder comprises two input connecting ends and one output connecting end; two input connecting ends of the first adder are respectively connected with the resonance voltage monitoring connecting end and the preset parameter input end, and one output connecting end of the first adder is connected with the first comparator;
the first subtracter comprises a positive input connecting end, a negative input connecting end and an output connecting end; a positive input connecting end of the first subtractor is connected with the preset parameter input end, a negative input connecting end of the first subtractor is connected with the envelope signal connecting end, and an output connecting end of the first subtractor is connected with the second comparator;
The first comparator comprises a positive input end, a negative input end and a comparison result output end; a positive input end of the first comparator is connected to the second gain circuit, a negative input end of the first comparator is connected to an output end of the first adder, and a comparison result output end of the first comparator is connected to the SR flip-flop;
the second comparator comprises a positive input end, a negative input end and a comparison result output end; a positive input end of the second comparator is connected with the first subtractor, a negative input end of the second comparator is connected with the second gain circuit, and a comparison result output end of the second comparator is connected with the SR flip-flop;
the SR trigger comprises an S signal input end, an R signal input end and a Q signal output end; the S signal input end is connected with the comparison result output end of the first comparator, the R signal input end is connected with the comparison result output end of the second comparator, and the Q signal output end is connected with the full-bridge driving circuit.
According to a second aspect, an embodiment provides an ac-dc conversion method based on a resonant full bridge, including:
acquiring an alternating voltage signal, a resonance voltage signal and an output voltage signal; the method comprises the steps that an alternating current voltage signal is obtained by monitoring an instant voltage signal of alternating current input into an alternating current-direct current conversion circuit, a resonance voltage signal is obtained by monitoring instant voltage signals at two ends of a resonance capacitor Cr of the resonance circuit of the alternating current-direct current conversion circuit, and an output voltage signal is obtained by monitoring a direct current voltage signal output by the alternating current-direct current conversion circuit;
Acquiring a first driving electric signal according to the alternating voltage signal, the resonance voltage signal and the output voltage signal;
and acquiring a first switch driving electric signal according to the first driving electric signal, wherein the first switch driving electric signal is used for driving the power switch tube of the alternating current-direct current conversion circuit to be switched on or switched off.
In one embodiment, the obtaining the first driving electrical signal according to the ac voltage signal, the resonant voltage signal, and the output voltage signal includes:
acquiring the first driving electric signal according to the resonance voltage signal and the sine wave envelope signal; and acquiring the sine wave envelope signal according to the alternating voltage signal and the output voltage signal.
In one embodiment, the obtaining of the sine wave envelope signal according to the ac voltage signal and the output voltage signal includes:
and multiplying the output voltage signal of the output voltage stabilizing ring by the alternating voltage signal to obtain the sine wave envelope signal following the voltage waveform of the alternating current.
In an embodiment, the ac-dc conversion method further includes:
and controlling the resonance voltage signal according to the sine wave envelope signal.
In one embodiment, the controlling the resonant voltage signal according to the sine wave envelope signal includes:
the resonance voltage signal changes along with the waveform of the alternating voltage signal, and the amplitude of the resonance voltage signal is adjusted through the output voltage signal, so that the closed-loop control of the input current and the input power of the alternating current is realized.
According to the alternating current-direct current conversion circuit of the embodiment, the alternating current-direct current conversion circuit comprises a rectifier bridge circuit, a full-bridge rectifier circuit, a resonance circuit, a voltage transformation circuit, an output circuit, a full-bridge drive circuit, a drive control circuit, an alternating current voltage monitoring circuit, a resonance voltage monitoring circuit and an output voltage monitoring circuit, wherein firstly, an alternating current voltage signal, a resonance voltage signal and an output voltage signal are respectively obtained by the alternating current voltage monitoring circuit, the resonance voltage monitoring circuit and the output voltage monitoring circuit; then the driving control circuit outputs a first driving electric signal to the full-bridge driving circuit according to the alternating current voltage signal, the resonance voltage signal and the output voltage signal; and finally, the full-bridge driving circuit acquires a first switch driving electric signal according to the first driving electric signal so as to drive a power switch tube of the alternating-current-direct-current conversion circuit. The high power factor rectifier is realized by closed-loop control of the relation among the alternating voltage signal, the resonance voltage signal and the output voltage signal, so that the alternating current-direct current conversion circuit is simplified, and the energy loss of the alternating current-direct current conversion circuit is reduced.
Drawings
FIG. 1 is a schematic circuit diagram of a prior art AC/DC converter;
FIG. 2 is a schematic diagram of the circuit connection of the AC-DC converter circuit in one embodiment;
FIG. 3 is a schematic diagram of the circuit connections of the driving control circuit according to an embodiment;
FIG. 4 is a diagram illustrating waveforms of envelope signals of sine waves according to an embodiment;
FIG. 5 is a schematic diagram of the resonant capacitor voltage and the positive and negative envelope curves from start-up to steady state in an embodiment of the AC/DC converter circuit;
FIG. 6 is a schematic diagram of waveforms of input voltage and current signals of an alternating current in one embodiment;
FIG. 7 is a diagram illustrating a comparison of waveforms of an AC voltage signal, a resonant voltage signal, and an output voltage signal according to an embodiment.
Detailed Description
The present invention will be described in further detail with reference to the following detailed description and accompanying drawings. Wherein like elements in different embodiments are numbered with like associated elements. In the following description, numerous details are set forth in order to provide a better understanding of the present application. However, those skilled in the art will readily recognize that some of the features may be omitted or replaced with other elements, materials, methods in different instances. In some instances, certain operations related to the present application have not been shown or described in detail in order to avoid obscuring the core of the present application from excessive description, and it is not necessary for those skilled in the art to describe these operations in detail, so that they may be fully understood from the description in the specification and the general knowledge in the art.
Furthermore, the described features, operations, or characteristics may be combined in any suitable manner to form various embodiments. Also, the various steps or actions in the description of the methods may be transposed or transposed in order, as will be apparent to a person skilled in the art. Thus, the various sequences in the specification and drawings are for the purpose of clearly describing certain embodiments only and are not intended to imply a required sequence unless otherwise indicated where a certain sequence must be followed.
The ordinal numbers used herein for the components, such as "first," "second," etc., are used merely to distinguish between the objects described, and do not have any sequential or technical meaning. The term "connected" and "coupled" as used herein includes both direct and indirect connections (couplings), unless otherwise specified.
Referring to fig. 1, a schematic circuit diagram of an ac/DC converter in the prior art is shown, where the ac/DC converter includes a rectifier bridge circuit 1, a power factor correction circuit 2, a half-bridge rectifier circuit 3, a resonant circuit 4, a transformer circuit 5, and an output circuit 6, and the power factor correction circuit 2 and the half-bridge rectifier circuit 3 operate independently of each other, if two functions of high power factor rectification and DC/DC isolation can be implemented on the ac/DC converter by using a control method of the resonant full-bridge circuit, the size and hardware cost of the DC power supply can be greatly reduced, and the ac/DC converter is more suitable for application in the fields of industrial chargers and USBPD.
In the embodiment of the application, an alternating current-direct current conversion method based on a resonant full bridge is disclosed. The alternating current voltage signal is obtained by monitoring an instant voltage signal of alternating current input into the alternating current-direct current conversion circuit, the resonance voltage signal is obtained by monitoring instant voltage signals at two ends of a resonance capacitor Cr of the resonance circuit of the alternating current-direct current conversion circuit, and the output voltage signal is obtained by monitoring a direct current voltage signal output by the alternating current-direct current conversion circuit. Then acquiring a first driving electric signal according to the alternating voltage signal, the resonance voltage signal and the output voltage signal; and finally, acquiring a first switch driving electric signal for driving a power switch tube of the alternating current-direct current conversion circuit according to the first driving electric signal. Because the function of a high-power-factor rectifier is replaced by closed-loop control of the relation among the alternating voltage signal, the resonance voltage signal and the output voltage signal, compared with the traditional scheme, the prior BOOST rectifier converter is omitted in the circuit topology, and therefore the alternating current-direct current conversion circuit is simplified and the energy loss of the alternating current-direct current conversion circuit is reduced.
Example one
Referring to fig. 2, a schematic diagram of circuit connections of an ac-dc conversion circuit in an embodiment is shown, where the ac-dc conversion circuit includes a rectifier bridge circuit 10, a full-bridge rectifier circuit 20, a resonant circuit 30, a transformer circuit 40, an output circuit 50, a full-bridge driving circuit 70, a driving control circuit 100, an ac voltage monitoring circuit 60, a resonant voltage monitoring circuit 80, and an output voltage monitoring circuit 90. The rectifier bridge circuit 10 is configured to rectify an ac power into a first dc power, and the rectifier bridge circuit 10 includes an ac positive input end, an ac negative input end, a dc positive output end, and a dc negative output end, where the ac positive input end and the ac negative input end are used for inputting an ac power, and the dc positive output end and the dc negative output end are used for outputting the first dc power. The full-bridge rectifier circuit 20 includes a dc positive input terminal, a dc negative input terminal, a rectifying positive output terminal and a rectifying negative output terminal, the dc positive input terminal and the dc negative input terminal are respectively connected to the dc positive output terminal and the dc negative output terminal, and the rectifying positive output terminal and the rectifying negative output terminal are connected to the resonant circuit 30. The full-bridge rectifier circuit 20 is configured to perform full-bridge rectification on the first direct current and output the full-bridge rectified direct current to the resonant circuit 30. The resonant circuit 30 includes a positive rectification connection end, a negative rectification connection end, a positive primary connection end and a negative primary connection end, the positive rectification connection end and the negative rectification connection end are respectively connected to the positive rectification output end and the negative rectification output end, and the positive primary connection end and the negative primary connection end are used for being connected to the voltage transformation circuit 40. The transformation circuit 40 includes a first primary connection end, a second primary connection end, a first secondary positive connection end, a first secondary negative connection end, a second secondary positive connection end, and a second secondary negative connection end. The first primary side connecting end and the second primary side connecting end are respectively connected with the primary side positive connecting end and the primary side negative connecting end, and the first secondary side positive connecting end, the first secondary side negative connecting end, the second secondary side positive connecting end and the second secondary side negative connecting end are used for being connected with the output circuit 50. The output circuit 50 includes a first input connection end, a second input connection end, a third input connection end, a fourth input connection end, an output positive connection end, and an output negative connection end. The first input connecting end and the second input connecting end are respectively connected with the first secondary positive connecting end and the first secondary negative connecting end, and the third input connecting end and the fourth input connecting end are respectively connected with the second secondary positive connecting end and the second secondary negative connecting end. The output positive connection and the output negative connection of the output circuit 50 are used to output the second direct current. The full-bridge driving circuit 70 is respectively connected to the driving control circuit 100 and the power switch tube of the full-bridge rectifying circuit 20, and is configured to output a first switch driving electrical signal to the power switch tube of the full-bridge rectifying circuit 20 in response to a first driving electrical signal output by the driving control circuit 100. The first switch driving electrical signal is used for driving the power switch tube of the full-bridge rectification circuit 20 to be switched on or switched off. The ac voltage monitoring circuit 60 is connected to the ac positive input terminal and the ac negative input terminal, and is configured to monitor an instantaneous voltage signal of the ac power and send an ac voltage signal obtained by monitoring the ac power to the driving control circuit 100. The resonant voltage monitoring circuit 80 is connected to the resonant capacitor Cr of the resonant circuit 30, and is configured to monitor an instant voltage signal at two ends of the resonant capacitor Cr, and send a resonant voltage signal obtained by monitoring the resonant capacitor Cr to the driving control circuit 100. The output voltage monitoring circuit 90 is connected to the output positive connection end of the output circuit 50, and is configured to monitor a voltage signal of the second direct current, and send an output voltage signal obtained by monitoring the second direct current to the driving control circuit 100. The driving control circuit 100 is configured to output a first driving electrical signal according to the ac voltage signal, the resonant voltage signal, and the output voltage signal.
In one embodiment, the rectifier bridge circuit 10 includes a diode D1, a diode D2, a diode D3, and a diode D4. In one embodiment, the full-bridge rectifier circuit 20 includes a first power switch S1, a second power switch S2, a third power switch S3, and a fourth power switch S4, wherein a collector of the first power switch S1 is connected to the dc positive input terminal, an emitter of the first power switch S1 is connected to the dc positive output terminal, a control electrode of the first power switch S1 is connected to the full-bridge driver circuit 70, a collector of the second power switch S2 is connected to the dc positive output terminal, an emitter of the second power switch S2 is connected to the dc negative input terminal, a control electrode of the second power switch S2 is connected to the full-bridge driver circuit 70, a collector of the third power switch S3 is connected to the dc positive input terminal, an emitter of the third power switch S3 is connected to the rectifying negative output terminal, a control electrode of the third power switch S3 is connected to the full-bridge driver circuit 70, a collector of the fourth power switch S4 is connected to the negative rectifying output terminal, the emitter of the fourth power switch tube S4 is connected to the dc negative input terminal, and the control electrode of the fourth power switch tube S4 is connected to the full bridge driving circuit 70. In an embodiment, the full-bridge rectifier circuit 20 further includes a capacitor C10 and a resistor R10, the capacitor C10 and the resistor R10 are connected in series, one end of the series connection is connected to the dc positive input terminal, and the other end is connected to the dc negative input terminal. In one embodiment, the resonant circuit 30 further includes an inductor Lr, and one end of the inductor Lr is connected to the rectifying positive connection terminal, and the other end of the inductor Lr is connected to the primary positive connection terminal. One end of the resonant capacitor Cr is connected with the rectification negative connection end, and the other end of the resonant capacitor Cr is connected with the primary side negative connection end. In one embodiment, the resonant circuit 30 further includes a sampling resistor RLf, the sampling resistor RLf is connected in series with the inductor Lr, one end of the series connection is connected to the positive rectification connection end, and the other end of the series connection is connected to the positive primary connection end. In one embodiment, the transformer circuit 40 includes a transformer Tr2, and the transformer Tr2 includes a primary inductor and two secondary inductors. One end of the primary side inductor is connected with the first primary side connecting end, the other end of the primary side inductor is connected with the second primary side connecting end, two ends of one secondary side inductor are respectively connected with the first secondary side positive connecting end and the first secondary side negative connecting end, and two ends of the other secondary side inductor are respectively connected with the second secondary side positive connecting end and the second secondary side negative connecting end. In one embodiment, the output circuit 50 includes a diode D11, a diode D12, a capacitor C11, a resistor R11, and a resistor R12. The anode of the diode D11 is connected to the first input connection terminal of the output circuit 50, and the cathode of the diode D11 is connected to the output positive connection terminal of the output circuit 50. The anode of the diode D12 is connected to the fourth input connection terminal of the output circuit 50, and the cathode of the diode D12 is connected to the output positive connection terminal of the output circuit 50. The capacitor C11 and the resistor R11 are connected in series, one end of the series connection is connected to the output positive connection end of the output circuit 50, and the other end of the series connection is connected to the output negative connection end of the output circuit 50. One end of the resistor R12 is connected to the output positive connection terminal of the output circuit 50, and the other end is connected to the output negative connection terminal of the output circuit 50. The second input connection terminal, the third input connection terminal and the output negative connection terminal of the output circuit 50 are electrically connected.
Referring to fig. 3, a circuit connection diagram of a driving control circuit in an embodiment is shown, and the driving control circuit 100 includes an envelope acquiring circuit 110 and a bangbang control circuit 120. The envelope acquisition circuit 110 is configured to multiply the output voltage signal by the ac voltage signal to acquire a sine wave envelope signal, and send the acquired sine wave envelope signal to the bangbang control circuit 120. The bangbang control circuit 120 is configured to obtain the sine wave envelope signal and the resonance voltage signal, obtain a first driving electrical signal according to the sine wave envelope signal and the resonance voltage signal, and output the first driving electrical signal to the full bridge driving circuit 70.
In one embodiment, the envelope acquiring circuit 110 includes an output voltage monitoring connection terminal, an ac voltage monitoring connection terminal, a preset digital signal input terminal 115, a first gain circuit 111, an absolute value acquiring circuit 112, a multiplier 113, an analog-to-digital converter 114, a digital signal subtractor 116, and a proportional-integral controller 117. The output voltage monitoring connection is connected to the output voltage monitoring circuit 90 for input of the output voltage signal VDC. The ac voltage monitoring connection is connected to an ac voltage monitoring circuit 60 for input of an ac voltage signal VAC. The preset digital signal input terminal 115 is used for inputting an electrical signal with a preset value. The analog-to-digital converter 114 is connected to the output voltage monitoring connection terminal and the digital signal subtractor 116, and the analog-to-digital converter 114 is configured to convert the output voltage signal into an output voltage digital signal and send the output voltage digital signal to the digital signal subtractor 116. Digital signal subtractor 116 includes a positive input terminal, a negative input terminal, and a result output terminal. A positive input terminal of the digital signal subtractor 116 is connected to the preset digital signal input terminal 115 for inputting the preset numerical value electrical signal. The negative input terminal of the digital signal subtractor 116 is connected to the analog-to-digital converter 114 for outputting an input of the voltage digital signal, and the resultant output terminal of the digital signal subtractor 116 is connected to the proportional-integral controller 117. Proportional-integral controllers 117 are connected to the multipliers 113, respectively, and the proportional-integral controllers 117 are used for voltage stabilization when the output voltage signals are closed-loop controlled. The first gain circuit 111 is connected to the ac voltage monitoring connection terminal and the absolute value obtaining circuit 112, respectively, and the first gain circuit 111 is configured to compensate for gain of the ac voltage signal and send the compensated ac voltage signal to the absolute value obtaining circuit 112. The absolute value obtaining circuit 112 is connected to the multiplier 113, and the absolute value obtaining circuit 112 is configured to obtain an absolute value of the gain-compensated ac voltage signal and output the absolute value of the ac voltage signal to the multiplier 113. The multiplier 113 includes two input terminals and a multiplication result output terminal, and the multiplication result output terminal of the multiplier 113 is connected to the bangbang control circuit 120. The multiplier 120 has one input terminal connected to the proportional-integral controller 117 and one input terminal connected to the absolute value acquisition circuit 112, and the multiplier 113 is configured to multiply the alternating voltage signal output by the absolute value acquisition circuit 112 with the electrical signal output by the proportional-integral controller 117, and send a sine wave envelope signal Ierf obtained by the multiplication to the bangbang control circuit 120.
In one embodiment, the bangbang control circuit 120 includes a resonant voltage monitoring connection, an envelope signal connection, a preset parameter input 122, a second gain circuit 121, a first adder 124, a first subtractor 123, a first comparator 126, a second comparator 125, and an SR flip-flop 127. The resonant voltage monitoring connection is connected to the resonant voltage monitoring circuit 80 for inputting the resonant voltage signal VC. The envelope signal connection terminal is connected to the envelope acquisition circuit 110, and is used for inputting the sine wave envelope signal Ierf. The preset parameter input 122 is used for inputting a preset first preset parameter electrical signal. The second gain circuit 121 is connected to the resonance voltage monitoring connection terminal, the first comparator 126, and the second comparator 125, respectively. The second gain circuit 121 is configured to perform gain compensation on the resonant voltage signal VC, and send the gain-compensated resonant voltage signal VC to the first comparator 126 and the second comparator 125. The first adder 124 includes two input connection ends and an output connection end, two input connection ends of the first adder 124 are respectively connected with the resonance voltage monitoring connection end and the preset parameter input end 122, an output connection end of the first adder 124 is connected with the first comparator 126, the first subtractor 123 includes a positive input connection end, a negative input connection end and an output connection end, the positive input connection end of the first subtractor 123 is connected with the preset parameter input end 122, the negative input connection end of the first subtractor 123 is connected with the envelope signal connection end, and the output connection end of the first subtractor 123 is connected with the second comparator 125. The first comparator 126 comprises a positive input terminal, a negative input terminal and a comparison result output terminal, the positive input terminal of the first comparator 126 is connected to the second gain circuit 121, the negative input terminal of the first comparator 126 is connected to the output terminal of the first adder 124, and the comparison result output terminal of the first comparator 126 is connected to the SR flip-flop 127. The second comparator 125 includes a positive input terminal, a negative input terminal, and a comparison result output terminal, the positive input terminal of the second comparator 125 is connected to the first subtractor 123, the negative input terminal of the second comparator 125 is connected to the second gain circuit 121, and the comparison result output terminal of the second comparator 125 is connected to the SR flip-flop 127. The SR flip-flop 127 includes an S signal input terminal connected to the comparison result output terminal of the first comparator 126, an R signal input terminal connected to the comparison result output terminal of the second comparator 125, and a Q signal output terminal connected to the full-bridge driving circuit 70.
Based on the above alternating current-direct current conversion circuit, the application also discloses an alternating current-direct current conversion method, which includes:
first, an alternating voltage signal, a resonance voltage signal, and an output voltage signal are acquired. The method comprises the steps of obtaining an alternating current voltage signal for monitoring an instant voltage signal of alternating current input into an alternating current-direct current conversion circuit, obtaining a resonance voltage signal for monitoring instant voltage signals at two ends of a resonance capacitor Cr of the resonance circuit of the alternating current-direct current conversion circuit, and obtaining an output voltage signal for monitoring a direct current voltage signal output by the alternating current-direct current conversion circuit.
And then acquiring a first driving electric signal according to the alternating voltage signal, the resonance voltage signal and the output voltage signal.
And finally, acquiring a first switch driving electric signal according to the first driving electric signal, wherein the first switch driving electric signal is used for driving the power switch tube of the alternating current-direct current conversion circuit to be switched on or switched off.
The method comprises the steps of obtaining a first driving electric signal according to an alternating voltage signal, a resonance voltage signal and an output voltage signal, and obtaining the first driving electric signal according to the resonance voltage signal and a sine wave envelope signal, wherein the sine wave envelope signal is obtained according to the alternating voltage signal and the output voltage signal.
The acquisition method of the sine wave envelope signal comprises the following steps:
the output voltage signal of output voltage regulator ring multiplies the alternating voltage signal, acquires the sine wave envelope signal of following the voltage waveform of alternating current, again according to sine wave envelope signal control resonance voltage signal, be about to resonance voltage signal follows the wave form change of alternating voltage signal, through the amplitude size of output voltage signal adjustment resonance voltage signal to the closed-loop control to the input current and the input power of alternating current has been realized.
The alternating current-direct current conversion circuit and the method provided by the embodiment of the application implement the function with the power factor on the basis of the resonant full-bridge converter, and a driving control circuit in a main controller of the alternating current-direct current conversion circuit samples the DC output voltage of the converter, the alternating current AC voltage input by a power grid and the voltage VC at two ends of a resonant capacitor. The resonant full-bridge converter uses bang bang to control the voltage of the resonant capacitor, and the inner loop of the current mode resonant converter has high gain, so that the excellent current following function can be realized. The PWM driving of the resonant full bridge converter switches is given by bangbang control. And multiplying the output of the output voltage stabilizing ring by the alternating-current input voltage to obtain a sine wave envelope line following the voltage waveform of the power grid, and controlling the voltages at two ends of the resonant capacitor. Therefore, the voltage of the resonant capacitor is the time integral of the current flowing into the resonant cavity from the power grid when the full-bridge switch is switched on, and the voltage at two ends of the resonant capacitor is reflected on the capacitor, so that the voltage at two ends of the full-bridge resonant capacitor is controlled to operate in a mode of following a sine wave envelope curve, the current flowing into the converter from the power grid can be changed in a mode of following the instantaneous value waveform of the power grid voltage, and the work of the high-power-factor rectifier is realized. Because the voltage envelope lines at the two ends of the resonant capacitor are the instantaneous values of the voltage received by the voltage receiving ring multiplied by the AC input voltage, the amplitude of the instantaneous values of the voltage at the two ends of the resonant capacitor can be adjusted through the output of the voltage receiving ring, and therefore closed-loop control over the input current and the input power is achieved.
Fig. 4 and fig. 5 are a schematic diagram of a waveform of a sine wave envelope signal and a schematic diagram of a resonant capacitor voltage and positive and negative envelopes when the ac-dc conversion circuit is in a steady state from a start-up state, respectively. The Bangbang control principle of the Bangbang control circuit comprises the following steps:
the output envelope of the multiplier is directly compared with the positive voltage of the resonant capacitor to obtain the high-level output of the SR trigger, the full bridge S1/S4 is started, the full bridge S1/S4 is closed when the voltage waveform of the resonant capacitor drops to the negative value (0-VC) of the envelope, the full bridge S2/S3 is complementarily turned on after the dead time is inserted, the voltage waveform of the resonant capacitor is guided to rise to the positive set value higher than the envelope, and then the full bridge S1/S4 is restarted and started. Because the resonant full-bridge converter can work in a ZVS working area in the whole process, the primary converter can realize the power conversion application of AC/DC with extremely high efficiency.
Referring to fig. 6, a waveform diagram of an input voltage and a current signal of an ac power in an embodiment is shown, in which a voltage of the ac power is 220V ac, an output voltage is 250V dc, and an output power is 3 KW.
Referring to fig. 7, a schematic diagram illustrating a comparison of waveforms of the ac voltage signal, the resonant voltage signal, and the output voltage signal according to an embodiment is shown. The alternating current-direct current conversion circuit disclosed by the application realizes the isolation DC/DC function with high power factor correction and zero voltage switch through control, can greatly reduce the volume and cost of the system, and has great advantages in the application of industrial chargers and USBPD.
In the ac-dc conversion circuit and method disclosed in the embodiments of the present application, an ac voltage signal, a resonance voltage signal, and an output voltage signal are first obtained. The alternating current voltage signal is obtained by monitoring an instant voltage signal of alternating current input into the alternating current-direct current conversion circuit, the resonance voltage signal is obtained by monitoring instant voltage signals at two ends of a resonance capacitor Cr of the resonance circuit of the alternating current-direct current conversion circuit, and the output voltage signal is obtained by monitoring a direct current voltage signal output by the alternating current-direct current conversion circuit. Then acquiring a first driving electric signal according to the alternating voltage signal, the resonance voltage signal and the output voltage signal; and finally, acquiring a first switch driving electric signal for driving a power switch tube of the alternating current-direct current conversion circuit according to the first driving electric signal. Because the function of a high-power factor rectifier is replaced by closed-loop control of the relation among the alternating current voltage signal, the resonance voltage signal and the output voltage signal, the alternating current-direct current conversion circuit is simplified, and the energy loss of the alternating current-direct current conversion circuit is reduced.
The present invention has been described in terms of specific examples, which are provided to aid in understanding the invention and are not intended to be limiting. Numerous simple deductions, modifications or substitutions may also be made by those skilled in the art in light of the present teachings.

Claims (7)

1. An alternating current-direct current conversion circuit based on a resonant full bridge is characterized by comprising a rectifier bridge circuit, a full bridge rectifier circuit, a resonant circuit, a voltage transformation circuit, an output circuit, a full bridge driving circuit, a driving control circuit, an alternating current voltage monitoring circuit, a resonant voltage monitoring circuit and an output voltage monitoring circuit;
the rectifier bridge circuit is used for rectifying an alternating current into a first direct current and comprises an alternating current positive input end, an alternating current negative input end, a direct current positive output end and a direct current negative output end; the alternating current positive input end and the alternating current negative input end are used for inputting the alternating current, and the direct current positive output end and the direct current negative output end are used for outputting the first direct current;
the full-bridge rectification circuit comprises a direct current positive input end, a direct current negative input end, a rectification positive output end and a rectification negative output end; the direct-current positive input end and the direct-current negative input end are respectively connected with the direct-current positive output end and the direct-current negative output end, and the rectification positive output end and the rectification negative output end are connected with the resonant circuit; the full-bridge rectification circuit is used for performing full-bridge rectification on the first direct current and outputting the first direct current to the resonance circuit;
The resonant circuit comprises a rectification positive connecting end, a rectification negative connecting end, a primary side positive connecting end and a primary side negative connecting end; the rectification positive connecting end and the rectification negative connecting end are respectively connected with the rectification positive output end and the rectification negative output end, and the primary side positive connecting end and the primary side negative connecting end are used for being connected with the transformation circuit;
the transformation circuit comprises a first primary side connecting end, a second primary side connecting end, a first secondary side positive connecting end, a first secondary side negative connecting end, a second secondary side positive connecting end and a second secondary side negative connecting end; the first primary side connecting end and the second primary side connecting end are respectively connected with the primary side positive connecting end and the primary side negative connecting end; the first secondary positive connecting end, the first secondary negative connecting end, the second secondary positive connecting end and the second secondary negative connecting end are used for being connected with the output circuit;
the output circuit comprises a first input connecting end, a second input connecting end, a third input connecting end, a fourth input connecting end, an output positive connecting end and an output negative connecting end; the first input connection end and the second input connection end are respectively connected with the first secondary positive connection end and the first secondary negative connection end, and the third input connection end and the fourth input connection end are respectively connected with the second secondary positive connection end and the second secondary negative connection end; the output positive connecting end and the output negative connecting end of the output circuit are used for outputting second direct current;
The full-bridge driving circuit is respectively connected with the driving control circuit and the power switch tube of the full-bridge rectifying circuit and is used for responding to a first driving electric signal output by the driving control circuit and outputting a first switch driving electric signal to the power switch tube of the full-bridge rectifying circuit;
the alternating current voltage monitoring circuit is connected with the alternating current positive input end and the alternating current negative input end and is used for monitoring an instant voltage signal of the alternating current and sending the alternating current voltage signal obtained by monitoring the alternating current to the drive control circuit;
the resonance voltage monitoring circuit is connected with a resonance capacitor Cr of the resonance circuit and is used for monitoring instant voltage signals at two ends of the resonance capacitor Cr and sending resonance voltage signals obtained by monitoring the resonance capacitor Cr to the drive control circuit;
the output voltage monitoring circuit is connected with the output positive connecting end of the output circuit and used for monitoring the voltage signal of the second direct current and sending the output voltage signal obtained by monitoring the second direct current to the drive control circuit;
the driving control circuit is used for outputting the first driving electric signal according to the alternating voltage signal, the resonance voltage signal and the output voltage signal;
The drive control circuit comprises an envelope curve acquisition circuit and a bangbang control circuit;
the envelope acquisition circuit is used for multiplying the output voltage signal by the alternating voltage signal to acquire a sine wave envelope signal and sending the acquired sine wave envelope signal to the bangbang control circuit;
the bangbang control circuit is used for acquiring the sine wave envelope signal and the resonance voltage signal, acquiring the first driving electric signal according to the sine wave envelope signal and the resonance voltage signal, and outputting the first driving electric signal to the full-bridge driving circuit.
2. The ac-dc converter circuit of claim 1, wherein said rectifier bridge circuit comprises diode D1, diode D2, diode D3, and diode D4;
and/or the full-bridge rectification circuit comprises a first power switch tube S1, a second power switch tube S2, a third power switch tube S3 and a fourth power switch tube S4; a collector of the first power switch tube S1 is connected to the dc positive input terminal, an emitter of the first power switch tube S1 is connected to the rectifying positive output terminal, and a control electrode of the first power switch tube S1 is connected to the full-bridge driving circuit; a collector of the second power switch tube S2 is connected to the rectifying positive output end, an emitter of the second power switch tube S2 is connected to the dc negative input end, and a control electrode of the second power switch tube S2 is connected to the full-bridge driving circuit; a collector of the third power switch tube S3 is connected to the dc positive input terminal, an emitter of the third power switch tube S3 is connected to the rectified negative output terminal, and a control electrode of the third power switch tube S3 is connected to the full-bridge driving circuit; a collector of the fourth power switch tube S4 is connected to the rectified negative output end, an emitter of the fourth power switch tube S4 is connected to the dc negative input end, and a control electrode of the fourth power switch tube S4 is connected to the full-bridge driving circuit;
And/or, the resonant circuit further comprises an inductance Lr; one end of the inductor Lr is connected with the rectifying positive connecting end, and the other end of the inductor Lr is connected with the primary side positive connecting end; one end of the resonant capacitor Cr is connected with the rectification negative connection end, and the other end of the resonant capacitor Cr is connected with the primary side negative connection end;
and/or, the transformer circuit comprises a transformer Tr2, the transformer Tr2 comprises a primary side inductor and two secondary side inductors; one end of the primary side inductor is connected with the first primary side connecting end, the other end of the primary side inductor is connected with the second primary side connecting end, two ends of one secondary side inductor are respectively connected with the first secondary side positive connecting end and the first secondary side negative connecting end, and two ends of the other secondary side inductor are respectively connected with the second secondary side positive connecting end and the second secondary side negative connecting end;
and/or the output circuit comprises a diode D11, a diode D12, a capacitor C11, a resistor R11 and a resistor R12; the anode of the diode D11 is connected with the first input connection end of the output circuit, and the cathode of the diode D11 is connected with the output positive connection end of the output circuit; the anode of the diode D12 is connected with the fourth input connecting end of the output circuit, and the cathode of the diode D12 is connected with the output positive connecting end of the output circuit; the capacitor C11 and the resistor R11 are connected in series, one end of the series connection is connected with the output positive connecting end of the output circuit, and the other end of the series connection is connected with the output negative connecting end of the output circuit; one end of the resistor R12 is connected with the output positive connecting end of the output circuit, and the other end of the resistor R12 is connected with the output negative connecting end of the output circuit; and the second input connecting end, the third input connecting end and the output negative connecting end of the output circuit are electrically connected.
3. The ac-dc conversion circuit according to claim 1, wherein the envelope acquisition circuit comprises an output voltage monitoring connection terminal, an ac voltage monitoring connection terminal, a preset digital signal input terminal, a first gain circuit, an absolute value acquisition circuit, a multiplier, an analog-to-digital converter, a digital signal subtractor, and a proportional-integral controller;
the output voltage monitoring connection end is connected with the output voltage monitoring circuit and is used for inputting the output voltage signal;
the alternating voltage monitoring connection end is connected with the alternating voltage monitoring circuit and is used for inputting the alternating voltage signal;
the preset digital signal input end is used for inputting an electric signal with a preset numerical value;
the analog-to-digital converter is respectively connected with the output voltage monitoring connection end and the digital signal subtracter, and is used for converting the output voltage signal into an output voltage digital signal and sending the output voltage digital signal to the digital signal subtracter;
the digital signal subtracter comprises a positive input end, a negative input end and a result output end; the positive input end of the digital signal subtracter is connected with the preset digital signal input end and is used for inputting the preset numerical value electric signal; the negative input end of the digital signal subtracter is connected with the analog-to-digital converter and is used for inputting the output voltage digital signal; the result output end of the digital signal subtracter is connected with the proportional-integral controller;
The proportional integral controllers are respectively connected with the multipliers; the proportional-integral controller is used for stabilizing voltage when the output voltage signal is subjected to closed-loop control;
the first gain circuit is respectively connected with the alternating voltage monitoring connection end and the absolute value acquisition circuit, and is used for carrying out gain compensation on the alternating voltage signal and then sending the alternating voltage signal to the absolute value acquisition circuit;
the absolute value acquisition circuit is connected with the multiplier and is used for taking an absolute value of the alternating voltage signal after gain compensation and outputting the alternating voltage signal after the absolute value is taken to the multiplier;
the multiplier comprises two input ends and a multiplication result output end, and the multiplication result output end of the multiplier is connected with the bangbang control circuit; one input end of the multiplier is connected with the proportional-integral controller, and the other input end of the multiplier is connected with the absolute value acquisition circuit; the multiplier is used for multiplying the alternating voltage signal output by the absolute value acquisition circuit and the electric signal output by the proportional-integral controller, and sending the sine wave envelope signal acquired by multiplication to the bangbang control circuit.
4. The ac-dc converter circuit of claim 1, wherein said bangbang control circuit comprises a resonant voltage monitoring connection, an envelope signal connection, a preset parameter input, a second gain circuit, a first adder, a first subtractor, a first comparator, a second comparator and an SR flip-flop;
the resonance voltage monitoring connecting end is connected with the resonance voltage monitoring circuit and used for inputting the resonance voltage signal;
the envelope signal connecting end is connected with the envelope line acquisition circuit and used for inputting the sine wave envelope line signal;
the preset parameter input end is used for inputting a preset first preset parameter electric signal;
the second gain circuit is respectively connected with the resonance voltage monitoring connection end, the first comparator and the second comparator; the second gain circuit is used for performing gain compensation on the resonance voltage signal and sending the resonance voltage signal after gain compensation to the first comparator and the second comparator;
the first adder comprises two input connecting ends and one output connecting end; two input connecting ends of the first adder are respectively connected with the resonance voltage monitoring connecting end and the preset parameter input end, and one output connecting end of the first adder is connected with the first comparator;
The first subtracter comprises a positive input connecting end, a negative input connecting end and an output connecting end; a positive input connecting end of the first subtracter is connected with the preset parameter input end, a negative input connecting end of the first subtracter is connected with the envelope signal connecting end, and an output connecting end of the first subtracter is connected with the second comparator;
the first comparator comprises a positive input end, a negative input end and a comparison result output end; a positive input end of the first comparator is connected to the second gain circuit, a negative input end of the first comparator is connected to an output end of the first adder, and a comparison result output end of the first comparator is connected to the SR flip-flop;
the second comparator comprises a positive input end, a negative input end and a comparison result output end; a positive input end of the second comparator is connected with the first subtractor, a negative input end of the second comparator is connected with the second gain circuit, and a comparison result output end of the second comparator is connected with the SR flip-flop;
the SR trigger comprises an S signal input end, an R signal input end and a Q signal output end; the S signal input end is connected with the comparison result output end of the first comparator, the R signal input end is connected with the comparison result output end of the second comparator, and the Q signal output end is connected with the full-bridge driving circuit.
5. An AC-DC conversion method based on a resonant full bridge is characterized by comprising the following steps:
acquiring an alternating voltage signal, a resonance voltage signal and an output voltage signal; the method comprises the steps that an alternating current voltage signal is obtained by monitoring an instant voltage signal of alternating current input into an alternating current-direct current conversion circuit, a resonance voltage signal is obtained by monitoring instant voltage signals at two ends of a resonance capacitor Cr of the resonance circuit of the alternating current-direct current conversion circuit, and an output voltage signal is obtained by monitoring a direct current voltage signal output by the alternating current-direct current conversion circuit;
acquiring a first driving electric signal according to the alternating voltage signal, the resonance voltage signal and the output voltage signal;
acquiring a first switch driving electric signal according to the first driving electric signal, wherein the first switch driving electric signal is used for driving the power switch tube of the alternating current-direct current conversion circuit to be switched on or switched off; the obtaining the first driving electrical signal according to the ac voltage signal, the resonant voltage signal, and the output voltage signal includes:
acquiring the first driving electric signal according to the resonance voltage signal and the sine wave envelope signal; wherein the sine wave envelope signal is obtained according to the alternating voltage signal and the output voltage signal,
And multiplying the output voltage signal of the output voltage stabilizing ring by the alternating voltage signal to obtain the sine wave envelope signal following the voltage waveform of the alternating current.
6. The ac-dc conversion method according to claim 5, further comprising:
and controlling the resonance voltage signal according to the sine wave envelope signal.
7. The method of claim 6, wherein said controlling said resonant voltage signal in accordance with said sine wave envelope signal comprises:
the resonance voltage signal changes along with the waveform of the alternating voltage signal, and the amplitude of the resonance voltage signal is adjusted through the output voltage signal, so that the closed-loop control of the input current and the input power of the alternating current is realized.
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