CN113472215A - Control method, circuit and device for widening LLC output voltage range - Google Patents
Control method, circuit and device for widening LLC output voltage range Download PDFInfo
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- CN113472215A CN113472215A CN202110919876.6A CN202110919876A CN113472215A CN 113472215 A CN113472215 A CN 113472215A CN 202110919876 A CN202110919876 A CN 202110919876A CN 113472215 A CN113472215 A CN 113472215A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/44—Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The application provides a widen LLC output voltage range control circuit, the circuit is full-bridge topology circuit for through predetermineeing the wave strategy control output frequency range, include: the wave transmitting module is used for converting input voltage provided by the power supply end according to a preset frequency modulation strategy and outputting first voltage with specific frequency and waveform to the LLC module; the LLC module is used for converting the first voltage into a second voltage and outputting the second voltage to the high-frequency rectifying module; and the output end of the high-frequency rectification module is used as the output end of the full-bridge topology circuit and is used for outputting a fixed-frequency output third voltage. By the circuit, the problems of large switching loss, large inductive turn-off voltage peak, large capacitive turn-on current peak and serious electromagnetic interference caused by hard switching can be solved; changing an LLC gain characteristic curve, and realizing fixed frequency control by low-voltage output; and to implement full range soft switching.
Description
Technical Field
The present application relates to the field of LLC output control technologies, and in particular, to a control method, circuit, and apparatus for widening an LLC output voltage range.
Background
A circuit for converting ac power into dc power by a rectifying circuit (rectifying circuit). Most of the rectifier circuits are composed of a transformer, a main rectifier circuit, a filter and the like. It is widely applied in the fields of speed regulation of direct current motors, excitation regulation of generators, electrolysis, electroplating and the like. The rectifier circuit is generally composed of a main circuit, a filter, and a transformer. The main circuit is composed of silicon rectifier diode and thyristor. The filter is connected between the main circuit and the load and is used for filtering alternating current components in the pulsating direct current voltage. Whether the transformer is arranged or not depends on the specific situation. The transformer is used for matching the alternating current input voltage and the direct current output voltage and electrically isolating the alternating current power grid from the rectifying circuit.
Unlike conventional PWM (pulse width modulation) converters, LLC is a resonant circuit that achieves output voltage constancy by controlling the switching frequency (frequency modulation). It has the advantages that: zero voltage switching-on (ZVS) of two primary side main MOS switches and zero current switching-off (ZCS) of a secondary side rectifier diode are realized, and through a soft switching technology, the switching loss of a power supply can be reduced, and the efficiency and the power density of the power converter are improved.
At present, however, the LLC module low-voltage section output control method has schemes of increasing dead time control, phase shift control, intermittent wave generation, and the like. However, the dead time is increased, the soft switch working environment is lost, and the soft switch has high working frequency, so that the soft switch has high switching loss and is easy to explode; the lagging arm of the power supply is controlled to be in a hard switch by phase shifting, the stress of the switch is large, the machine is easy to explode, the problem of the hard switch can be solved by intermittent wave generation, the bandwidth response of a high-power supply adopting a digital control loop cannot be fast enough, and the noise of the peak value of the output low voltage can be multiplied; in addition, the output voltage frequency and voltage value range in the prior art is small, the voltage frequency and voltage value range cannot be directly suitable for a load, loss is increased after conversion is carried out again, and energy efficiency is reduced.
Disclosure of Invention
In view of the above, the present application is proposed to provide a method, circuit and apparatus for controlling an LLC output voltage range, which overcomes or at least partially solves the above problems, and comprises: the utility model provides a widen LLC output voltage range control circuit, the circuit is full-bridge topology circuit for through the output frequency range of preset ripples strategy control, include:
the wave transmitting module is connected to the input end of the LLC module and used for converting input voltage provided by a power supply end according to a preset frequency modulation strategy and outputting first voltage with specific frequency and waveform to the LLC module; the wave-transmitting module comprises an output end A and an output end B, and the preset frequency modulation strategy comprises that the output frequencies of the output end A and the output end B are the same and the waveforms are opposite;
the output end of the LLC module is connected to the input end of the high-frequency rectification module, and the LLC module is used for converting the first voltage into a second voltage and outputting the second voltage to the high-frequency rectification module;
and the output end of the high-frequency rectifying module is used for outputting a fixed-frequency output third voltage, wherein the fixed-frequency output third voltage is obtained by rectifying and outputting the second voltage through the high-frequency rectifying module.
Further, the wave module includes:
a first filtering unit and a converting unit;
the first filtering unit is connected with the converting unit in parallel, one end of the first filtering unit in parallel connection is connected to the power supply end, and the other end of the first filtering unit in parallel connection is grounded;
two output terminals of the conversion unit are the a output terminal and the B output terminal connected to the LLC module.
Further, the conversion unit includes:
the D pole of the first MOS tube is connected with the power supply end, the S pole of the first MOS tube is connected with the D pole of the second MOS tube to serve as the A output end, and the S pole of the second MOS tube is grounded;
the D pole of the third MOS tube is connected with the power supply end, the S pole of the third MOS tube is connected with the D pole of the fourth MOS tube to serve as the B output end, and the S pole of the fourth MOS tube is grounded;
the first MOS transistor, the second MOS transistor, the third MOS transistor and the fourth MOS transistor all include a parasitic diode and a parasitic capacitor, specifically, the first MOS transistor includes a parasitic diode D1 and a parasitic capacitor C1, the second MOS transistor includes a parasitic diode D2 and a parasitic capacitor C2, the third MOS transistor includes a parasitic diode D3 and a parasitic capacitor C3, and the fourth MOS transistor includes a parasitic diode D4 and a parasitic capacitor C4.
Further, the LLC module includes:
a resonant inductor Lr, a resonant capacitor Cr and a transformer T1;
one end of the resonant inductor Lr is connected to the output end a, the other end of the resonant inductor Lr is connected to one end of the resonant capacitor Cr, the other end of the resonant capacitor Cr is connected to one end of the primary winding of the transformer T1, and the other end of the primary winding is connected to the output end B;
and the secondary winding of the transformer T1 is the output end of the LLC module.
Further, the high frequency rectification module includes:
the high-frequency full-wave rectifier bridge and the second filtering unit;
the positive electrode and the negative electrode of the high-frequency full-wave rectifier bridge are connected with the second filtering unit in parallel;
the input end of the high-frequency full-wave rectifier bridge is connected to the output end of the LLC module, and specifically, the two input ends of the high-frequency full-wave rectifier bridge are respectively connected to the two output ends of the LLC module.
Further, the high-frequency full-wave rectifier bridge is composed of four identical high-frequency diodes, and comprises:
the fifth high-frequency diode and the sixth high-frequency diode are connected in series in the same direction, and the series connection position is an input end of the high-frequency rectifying module;
the seventh high-frequency diode and the eighth high-frequency diode are connected in series in the same direction, and the series connection position is the other input end of the high-frequency rectifying module;
the cathode of the fifth high-frequency diode is connected with the cathode of the seventh high-frequency diode and is used as the anode output end of the high-frequency rectifying module;
the cathode of the sixth high-frequency diode is connected with the cathode of the eighth high-frequency diode and serves as the cathode output end of the high-frequency rectifying module;
and the positive output end and the negative output end are used as output ends of the high-frequency full-wave rectifier bridge to be connected with a load.
Further, the first filtering unit at least comprises an input capacitor Cin; one end of the input capacitor Cin is electrically connected with the power supply end, and the other end of the input capacitor Cin is grounded.
Further, the second filtering unit at least comprises an output capacitor Cout, one end of the output capacitor Cout is connected with the anode of the high-frequency full-wave rectifying bridge, and the other end of the output capacitor Cout is connected with the cathode of the high-frequency full-wave rectifying bridge.
A control method for widening LLC output voltage range, the method is used for controlling output frequency range of a full-bridge topology circuit by a preset wave-sending strategy, and comprises the following steps:
outputting a first voltage with specific frequency and waveform to the LLC module through the wave transmitting module according to a preset frequency modulation strategy;
the LLC module converts the first voltage to generate a second voltage and outputs the second voltage to the high-frequency rectifying module;
the high-frequency rectifying module rectifies the second voltage and outputs a third voltage at a fixed frequency.
A control device for widening the LLC output voltage range is packaged with the control circuit for widening the LLC output voltage range. A widened LLC output voltage range control device is packaged with the widened LLC output voltage range control circuit.
The application has the following advantages:
in the embodiment of the application, the power supply module is electrically connected to an input end of the LLC module through the wave transmitting module, and is configured to output a first voltage with a specific frequency and waveform to the LLC module through the wave transmitting module according to a preset frequency modulation strategy; the output end of the LLC module is electrically connected to the input end of the high-frequency rectification module, and the LLC module is used for converting the first voltage into a second voltage and outputting the second voltage to the high-frequency rectification module; the output end of the high-frequency rectifying module is electrically connected to a load and used for rectifying the second voltage through the high-frequency rectifying module and outputting a third voltage at a fixed frequency. By the circuit, the problems of large switching loss, large inductive turn-off voltage peak, large capacitive turn-on current peak and serious electromagnetic interference caused by hard switching can be solved; changing an LLC gain characteristic curve, and realizing fixed frequency control by low-voltage output; and to implement full range soft switching.
Drawings
In order to more clearly illustrate the technical solutions of the present application, the drawings needed to be used in the description of the present application will be briefly introduced below, and it is apparent that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive labor.
Fig. 1 is a schematic diagram of a control circuit for widening an LLC output voltage range according to an embodiment of the present application
FIG. 2 is a waveform of an embodiment of the present application for controlling an LLC output voltage range to be widened;
FIG. 3 is a waveform of a control circuit for widening the LLC output voltage range according to an embodiment of the present application;
FIG. 4 is a flowchart illustrating steps of a method for controlling an LLC output voltage range according to an embodiment of the present application;
fig. 5 is a diagram illustrating an operation waveform of a control circuit for widening an LLC output voltage range, which can implement soft switching by pure frequency modulation according to an embodiment of the present application;
FIG. 6 is a waveform illustrating a hard switching state of a control circuit for widening an LLC output voltage range according to an embodiment of the present application;
fig. 7 shows voltages and corresponding driving waveforms after the control circuit for widening the LLC output voltage range is implemented by phase shift control according to an embodiment of the present application.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present application more comprehensible, the present application is described in further detail with reference to the accompanying drawings and the detailed description. It is to be understood that the embodiments described are only a few embodiments of the present application and 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 application.
Referring to fig. 1, a circuit for controlling an extended LLC output voltage range provided in an embodiment of the present application, the circuit being used for adjusting a voltage output frequency range by an LLC, includes: the wave transmitting module 1 is connected to an input end of the LLC module 2, and the wave transmitting module 1 is used for converting an input voltage provided by a power supply end according to a preset frequency modulation strategy and outputting a first voltage with a specific frequency and a specific waveform to the LLC module 2; the wave-transmitting module 1 comprises an output end A and an output end B, and the preset frequency modulation strategy comprises that the output frequencies of the output end A and the output end B are the same and the waveforms are opposite; the output end of the LLC module 2 is connected to the input end of the high-frequency rectification module 3, and the LLC module 2 is configured to convert the first voltage into a second voltage, and output the second voltage to the high-frequency rectification module 3; and the output end of the high-frequency rectifying module 3 is used for outputting a fixed-frequency output third voltage, wherein the fixed-frequency output third voltage is obtained by rectifying and outputting the second voltage through the high-frequency rectifying module.
The output frequencies (switching frequencies) of the output ends A and B are consistent, and duty ratio chopping is carried out according to the requirement of output voltage. Referring to fig. 2 for the operating waveforms, it can be seen that the new control scheme can solve the hard switching problem while broadening the output voltage.
In an embodiment of the present invention, the wave module 1 includes: a first filtering unit and a converting unit; the first filtering unit is connected with the converting unit in parallel, one end of the first filtering unit in parallel connection is connected to the power supply end, and the other end of the first filtering unit in parallel connection is grounded; two output ends of the conversion unit are the output end A and the output end B which are connected to the LLC module; the first filtering unit at least comprises an input capacitor Cin; one end of the Cin is electrically connected with the power supply end, and the other end of the Cin is grounded; the first filtering unit makes the input current of the wave-transmitting module 1 more stable.
In an embodiment of the present invention, the conversion unit includes: the D pole of the first MOS tube Q1 is connected with the power supply end, the S pole is connected with the D pole of the second MOS tube Q2 as the A output end, and the S pole of the second MOS tube Q2 is grounded; the D pole of the third MOS tube Q3 is connected with the power supply end, the S pole is connected with the D pole of the fourth MOS tube Q4 as the B output end, and the S pole of the fourth MOS tube Q4 is grounded; first MOS transistor Q1, second MOS transistor Q2, third MOS transistor Q3 and fourth MOS transistor Q4 all contain parasitic diode and parasitic capacitance, specifically, first MOS transistor Q1 includes, parasitic diode D1 and parasitic capacitance C1, second MOS transistor Q2 includes, parasitic diode D2 and parasitic capacitance C2, third MOS transistor Q3 includes, parasitic diode D3 and parasitic capacitance C3, fourth MOS transistor Q4 includes, parasitic diode D4 and parasitic capacitance C4.
In an embodiment of the present invention, the LLC module 2 includes: a resonant inductor Lr, a resonant capacitor Cr and a transformer T1; one end of the resonant inductor Lr is connected to the output end a, the other end of the resonant inductor Lr is connected to one end of the resonant capacitor Cr, the other end of the resonant capacitor Cr is connected to one end of the primary winding of the transformer T1, and the other end of the primary winding is connected to the output end B; and the secondary winding of the transformer T1 is the output end of the LLC module.
In the above embodiment, the primary winding of the transformer T1, the resonant capacitor Cr and the resonant inductor Lr form the front stage of the LLC module; the vibration inductor Lr is connected in series with the primary winding of the transformer T1 through the resonant capacitor Cr to form an LLC loop, so that compared with the phase technology, the inductance parallel connected with the primary winding of the transformer T1 is reduced, the inductance loop formed by the effective inductance and the primary winding of the transformer T1 is formed, and the coupling quality of the secondary winding and the primary winding is improved; the secondary winding of the transformer T1 couples the primary winding and is connected as an output of the LLC to the high-frequency rectification module 3.
In an embodiment of the present invention, the high-frequency rectification module 3 includes: the high-frequency full-wave rectifier bridge and the second filtering unit; the positive electrode and the negative electrode of the high-frequency full-wave rectifier bridge are connected with the second filtering unit in parallel; the input end of the high-frequency full-wave rectifier bridge is connected to the output end of the LLC module, and specifically, the two input ends of the high-frequency full-wave rectifier bridge are respectively connected to the two output ends of the LLC module;
further, the second filtering unit at least comprises an output capacitor Cout, one end of the output capacitor Cout is connected with the anode of the high-frequency full-wave rectifying bridge, and the other end of the output capacitor Cout is connected with the cathode of the high-frequency full-wave rectifying bridge; the output is filtered through the output capacitor Cout, so that the output of the LLC output voltage range control circuit is widened, high-frequency clutter cannot occur, and the output is more stable.
In an embodiment of the present invention, the high frequency full wave rectifier bridge is composed of four identical high frequency diodes, and includes: the fifth high-frequency diode D5 and the sixth high-frequency diode 56 are connected in series in the same direction, and the series position is an input end of the high-frequency rectifying module 3; the seventh high-frequency diode D7 and the eighth high-frequency diode D8 are connected in series in the same direction, and the series position is the other input end of the high-frequency rectifying module 3; the cathode of the fifth high-frequency diode D5 is connected with the cathode of the seventh high-frequency diode D7 and is used as the anode output end of the high-frequency rectifying module 3; the cathode of the sixth high-frequency diode D6 is connected with the cathode of the eighth high-frequency diode D8 as the cathode output end of the high-frequency rectification module 3; and the positive output end and the negative output end are used as output ends of the high-frequency full-wave rectifier bridge to be connected with a load.
In one specific implementation, waveforms in the working flow of the circuit of the present invention are shown in fig. 3, and with reference to fig. 1, the specific working process is as follows:
(1) at the time of T0, charging and discharging of junction capacitors (including a parasitic capacitor C1, a parasitic capacitor C2 and parasitic capacitors between a D pole and a G pole and between a G pole and an S pole in the MOS transistor) of the first MOS transistor Q1 and the second MOS transistor Q2 are finished, since a current of a resonant inductor Lr is larger than a current of an excitation inductor, a voltage applied to a resonant cavity is a positive bus voltage, the high-frequency rectifier diodes D7 and D6 are turned on, a primary side (a primary winding) of the transformer T1 charges and supplies energy to a load from an output capacitor Cout on a secondary side (a secondary winding), and ZVS turns on the first MOS transistor Q1 and the fourth MOS transistor Q4;
(2) t0-t1, the resonant inductor Lr and the resonant capacitor Cr participate in resonance, the forward direction of the resonant inductor current increases, the rectifier diodes D7 and D6 continue to be conducted, and the primary side continues to charge the secondary side output capacitor Cout and provide energy for the load;
(3) at the time of t1-t2 and t1, after chopping of the fourth MOS transistor Q4 is turned off, the junction capacitors (including the parasitic capacitor C3 and the parasitic capacitor C4, and the parasitic capacitors between the D pole and the G pole, and between the G pole and the S pole in the MOS transistor) of the third MOS transistor Q3 and the fourth MOS transistor Q4 complete charging and discharging, the resonant current generated by the resonant inductor Lr flows through the parasitic diode in the third MOS transistor Q3 and the first MOS transistor Q1, and since the current of the resonant inductor Lr is greater than the current of the excitation inductor, the high-frequency rectifier diodes D7 and D6 continue to be conducted, and the primary side supplies energy to the secondary side output capacitor Cout for charging and load supplying energy;
(4) at the time of t2-t3 and t2, the current of the resonant inductor Lr flows through a parasitic diode D3 and a first MOS transistor Q1 in a third MOS transistor Q3, the current of the resonant inductor Lr decreases in the forward direction, the high-frequency rectifier diodes D7 and D6 continue to be conducted, and the primary side outputs the capacitor Cout to charge and the load provides energy;
(5) at the time of t3-t4 and t3, the current of the resonant inductor Lr is equal to the current of the excitation inductor, the high-frequency rectifier diodes D7 and D6 are turned off in a zero-crossing mode, the excitation inductor (primary winding of the transformer) and the resonant inductor Lr resonate together with the resonant capacitor Cr, and the primary side stops charging the secondary side output capacitor Cout and provides energy for a load;
(6) at the time of t4-t5 and t4, after the first MOS transistor Q1 is turned off, the current of the resonant inductor Lr is greater than the current of the excitation inductor, the high-frequency rectifier diodes D5 and D8 are turned on, the primary side starts to charge the secondary output capacitor Cout and provide energy for the load, and at the same time, the charging and discharging of the junction capacitors (including the parasitic capacitor C2 and the parasitic capacitor C3, and the parasitic capacitors between the D pole and the G pole, and between the G pole and the S pole) of the second MOS transistor Q2 and the third MOS transistor Q3 are completed in this stage, so that the preparation for the ZVS switching on in the next stage is made;
(7) and then the working process of the next half period is carried out, the principle is similar, and the description is omitted.
The invention has the advantages that the LLC gain characteristic curve is changed, and the fixed frequency control is realized by low-voltage output; realizing full-range soft switching; the full-wave rectifier bridge formed by the high-frequency rectifier diodes realizes quick high-frequency quick on-off response.
It should be noted that the parasitic capacitance in the MOS transistor is inevitably generated in the manufacturing process, and the size of the parasitic capacitance affects the conduction of the MOS transistor, so in the embodiment of the present invention, the influence of the parasitic capacitance on the circuit needs to be fully considered, so that the full-bridge topology circuit is matched by the wave-generating strategy, and the parasitic capacitance outputs a voltage in a wide frequency range and a voltage value in a large range (for example, a voltage of 200 to 406V can be stably output).
As an example, the resonant cavity parameter Lr of the LLC module 2 is 11uH, Cr 117nF, Lm 55uH, Nps 10/14, Vin 415V, fs 250KHz, RL 50 Ω, where Lm is the inductance of the primary winding of the transformer, Nps is the coil-to-coil ratio between the primary winding and the secondary winding (primary side and secondary side) of the transformer, Vin is the input voltage value, fs is the resonant frequency, and RL is the load impedance; in the prior art, soft switching can be realized by pure frequency modulation, and the waveform of the soft switching is shown in fig. 5, but the output voltage Vout is 406V;
in the present application, in order to control the output voltage to 200V, the voltages and corresponding driving waveforms after the adjustment of the dead zone are as shown in fig. 6, and it can be seen that all MOS transistors operate in a hard-switching state: the voltages and corresponding driving waveforms after the phase shift control is realized are shown in fig. 7, the leading arm can work in a soft switching mode, and the lagging arm cannot realize the soft switching mode.
Referring to fig. 4, a control method for widening an LLC output voltage range provided in an embodiment of the present application is shown, and the method is used for controlling an output frequency range of a full-bridge topology circuit through a preset wave-sending strategy, and includes:
s410, outputting a first voltage with a specific frequency and a specific waveform to the LLC module through the wave transmitting module according to a preset frequency modulation strategy;
s420, the LLC module converts the first voltage to generate a second voltage and outputs the second voltage to a high-frequency rectification module;
and S430, the high-frequency rectifying module rectifies the second voltage and outputs a third voltage at a fixed frequency.
For the device embodiment, since it is basically similar to the method embodiment, the description is simple, and for the relevant points, refer to the partial description of the method embodiment.
In an embodiment of the present invention, a control device for widening an LLC output voltage range is disclosed, said device being packaged with said widened LLC output voltage range control circuit.
The embodiments in the present specification are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
While preferred embodiments of the present application have been described, additional variations and modifications of these embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including the preferred embodiment and all such alterations and modifications as fall within the true scope of the embodiments of the application.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or terminal that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or terminal. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or terminal that comprises the element.
The method, the circuit and the device for controlling the widened LLC output voltage range provided by the present application are introduced in detail, and specific examples are applied herein to illustrate the principles and embodiments of the present application, and the descriptions of the above embodiments are only used to help understand the method and the core ideas of the present application; meanwhile, for a person skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.
Claims (10)
1. The utility model provides a widen LLC output voltage range control circuit which characterized in that, the circuit is full-bridge topology circuit for through predetermineeing the wave strategy control output frequency range, include:
the wave transmitting module is connected to the input end of the LLC module and used for converting input voltage provided by a power supply end according to a preset frequency modulation strategy and outputting first voltage with specific frequency and waveform to the LLC module; the wave-transmitting module comprises an output end A and an output end B, and the preset frequency modulation strategy comprises that the output frequencies of the output end A and the output end B are the same and the waveforms are opposite;
the output end of the LLC module is connected to the input end of the high-frequency rectification module, and the LLC module is used for converting the first voltage into a second voltage and outputting the second voltage to the high-frequency rectification module;
and the output end of the high-frequency rectifying module is used as the output end of the full-bridge topology circuit and is used for outputting a fixed-frequency output third voltage, wherein the fixed-frequency output third voltage is obtained by rectifying and outputting the second voltage through the high-frequency rectifying module.
2. The circuit of claim 1, wherein the wave module comprises:
a first filtering unit and a converting unit;
the first filtering unit is connected with the converting unit in parallel, one end of the first filtering unit in parallel connection is connected to the power supply end, and the other end of the first filtering unit in parallel connection is grounded;
two output terminals of the conversion unit are the a output terminal and the B output terminal connected to the LLC module.
3. The circuit of claim 2, wherein the conversion unit comprises:
the D pole of the first MOS tube is connected with the power supply end, the S pole of the first MOS tube is connected with the D pole of the second MOS tube and serves as the output end A, and the S pole of the second MOS tube is grounded;
the D pole of the third MOS tube is connected with the power supply end, the S pole of the third MOS tube is connected with the D pole of the fourth MOS tube to serve as the B output end, and the S pole of the fourth MOS tube is grounded;
the first MOS transistor, the second MOS transistor, the third MOS transistor and the fourth MOS transistor all include a parasitic diode and a parasitic capacitor, specifically, the first MOS transistor includes a parasitic diode D1 and a parasitic capacitor C1, the second MOS transistor includes a parasitic diode D2 and a parasitic capacitor C2, the third MOS transistor includes a parasitic diode D3 and a parasitic capacitor C3, and the fourth MOS transistor includes a parasitic diode D4 and a parasitic capacitor C4.
4. The circuit of claim 3, wherein the LLC module comprises:
a resonant inductor Lr, a resonant capacitor Cr and a transformer T1;
one end of the resonant inductor Lr is connected to the output end a, the other end of the resonant inductor Lr is connected to one end of the resonant capacitor Cr, the other end of the resonant capacitor Cr is connected to one end of the primary winding of the transformer T1, and the other end of the primary winding is connected to the output end B;
and the secondary winding of the transformer T1 is the output end of the LLC module.
5. The circuit of claim 4, wherein the high frequency rectification module comprises:
the high-frequency full-wave rectifier bridge and the second filtering unit;
the positive electrode and the negative electrode of the high-frequency full-wave rectifier bridge are connected with the second filtering unit in parallel;
and the input end of the high-frequency full-wave rectifier bridge is connected to the output end of the LLC module.
6. The circuit of claim 5, wherein the high frequency full wave rectifier bridge is comprised of four identical high frequency diodes, comprising:
the fifth high-frequency diode and the sixth high-frequency diode are connected in series in the same direction, and the series position is an input end of the high-frequency rectifying module;
the seventh high-frequency diode and the eighth high-frequency diode are connected in series in the same direction, and the series position is the other input end of the high-frequency rectifying module;
the cathode of the fifth high-frequency diode is connected with the cathode of the seventh high-frequency diode and is used as the anode output end of the high-frequency rectifying module;
the cathode of the sixth high-frequency diode is connected with the cathode of the eighth high-frequency diode and serves as the cathode output end of the high-frequency rectifying module;
and the positive output end and the negative output end are used as output ends of the high-frequency full-wave rectifier bridge to be connected with a load.
7. The circuit according to claim 2, wherein the first filtering unit comprises at least one input capacitor Cin; one end of the input capacitor Cin is electrically connected with the power supply end, and the other end of the input capacitor Cin is grounded.
8. The circuit according to claim 5, wherein the second filtering unit comprises at least one output capacitor Cout, one end of the output capacitor Cout is connected to the positive electrode of the high-frequency full-wave rectifying bridge, and the other end of the output capacitor Cout is connected to the negative electrode of the high-frequency full-wave rectifying bridge.
9. A control method for widening LLC output voltage range is characterized in that the method is used for controlling the output frequency range of a full-bridge topology circuit through a preset wave-sending strategy, and comprises the following steps:
outputting a first voltage with a specific frequency and a specific waveform to the LLC module through the wave transmitting module according to a preset frequency modulation strategy;
the LLC module converts the first voltage to generate a second voltage and outputs the second voltage to the high-frequency rectifying module;
the high-frequency rectifying module rectifies the second voltage and outputs a third voltage at a fixed frequency.
10. An extended LLC output voltage range control arrangement, characterized in that the arrangement is packaged with an extended LLC output voltage range control circuit according to any one of claims 1-8.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116865562A (en) * | 2023-09-04 | 2023-10-10 | 深圳市瀚强科技股份有限公司 | Boost circuit and control method for boost circuit |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6483724B1 (en) * | 2002-02-15 | 2002-11-19 | Valere Power, Inc. | DC/DC ZVS full bridge converter power supply method and apparatus |
| CN104467443A (en) * | 2015-01-06 | 2015-03-25 | 山东鲁能智能技术有限公司 | Super-wide output voltage range charger based on LLC topology and control method |
| CN106787765A (en) * | 2017-02-06 | 2017-05-31 | 山东鲁能智能技术有限公司 | The system and method for realizing ultra-wide output voltage range based on LLC topologys |
| CN111786567A (en) * | 2020-07-28 | 2020-10-16 | 石家庄通合电子科技股份有限公司 | Control method for reducing output ripple of full-bridge LLC converter during intermittence |
-
2021
- 2021-08-11 CN CN202110919876.6A patent/CN113472215A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6483724B1 (en) * | 2002-02-15 | 2002-11-19 | Valere Power, Inc. | DC/DC ZVS full bridge converter power supply method and apparatus |
| CN104467443A (en) * | 2015-01-06 | 2015-03-25 | 山东鲁能智能技术有限公司 | Super-wide output voltage range charger based on LLC topology and control method |
| CN106787765A (en) * | 2017-02-06 | 2017-05-31 | 山东鲁能智能技术有限公司 | The system and method for realizing ultra-wide output voltage range based on LLC topologys |
| CN111786567A (en) * | 2020-07-28 | 2020-10-16 | 石家庄通合电子科技股份有限公司 | Control method for reducing output ripple of full-bridge LLC converter during intermittence |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116865562A (en) * | 2023-09-04 | 2023-10-10 | 深圳市瀚强科技股份有限公司 | Boost circuit and control method for boost circuit |
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