CN111130355B - Full-bridge direct-current converter for realizing full-range soft switching - Google Patents
Full-bridge direct-current converter for realizing full-range soft switching Download PDFInfo
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- CN111130355B CN111130355B CN201911390652.XA CN201911390652A CN111130355B CN 111130355 B CN111130355 B CN 111130355B CN 201911390652 A CN201911390652 A CN 201911390652A CN 111130355 B CN111130355 B CN 111130355B
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- 238000004804 winding Methods 0.000 claims description 14
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- 230000008569 process Effects 0.000 claims description 5
- 230000008859 change Effects 0.000 claims description 3
- 230000000087 stabilizing effect Effects 0.000 claims description 3
- 230000000295 complement effect Effects 0.000 claims description 2
- 238000002360 preparation method Methods 0.000 claims 1
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- 238000006243 chemical reaction Methods 0.000 description 1
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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
- H02M3/33576—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 having at least one active switching element at the secondary side of an isolation transformer
- H02M3/33592—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 having at least one active switching element at the secondary side of an isolation transformer having a synchronous rectifier circuit or a synchronous freewheeling circuit at the secondary side of an isolation transformer
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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
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
- H02M1/083—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the ignition at the zero crossing of the voltage or the current
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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
- H02M1/0048—Circuits or arrangements for reducing losses
- H02M1/0054—Transistor switching losses
- H02M1/0058—Transistor switching losses by employing soft switching techniques, i.e. commutation of transistors when applied voltage is zero or when current flow is zero
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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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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a full-bridge direct-current converter for realizing full-range soft switching, which comprises a full-bridge synchronous rectifier bridge and a rectifier side filter circuit, wherein the full-bridge synchronous rectifier bridge is connected with the rectifier side filter circuit; further comprising: the system comprises a lag bridge arm, an auxiliary resonance bridge arm, a lead bridge arm, a resonance inductor L2 and a main power transformer T1; the auxiliary resonant bridge arm adopts a CLC star resonant network and comprises a resonant inductor L1, a resonant capacitor C2 and a resonant capacitor C3; one end of a resonant capacitor C2 is connected with a connection point between positive input ends of the lag bridge arm and the lead bridge arm, and the other end of the resonant capacitor C2 is connected with a connection point between negative input ends of the lag bridge arm and the lead bridge arm after passing through a resonant capacitor C3; the input end of the resonant inductor L1 is connected with the output end of the hysteresis bridge arm, and the output end of the resonant inductor L1 is connected with the connection point between the resonant capacitor C2 and the resonant capacitor C3. The invention can realize the soft switching of the hysteresis bridge arm in a wide input voltage range, a wide output voltage range and a full load range.
Description
Technical Field
The invention belongs to a constant-frequency isolated full-bridge direct-current converter, and particularly relates to a full-bridge direct-current converter for realizing full-range soft switching.
Background
At present, a full-bridge topological structure cannot work in a high-frequency application scene, because a rear bridge arm is a hard switch during light load and time lag, the loss is too large, so that the high-frequency and high-efficiency application of a system is limited, if an LLC circuit structure is adopted, the full-soft switch can be realized, but the LLC circuit structure works in a frequency conversion mode, the frequency change range is too wide, the whole system design is not facilitated, and the LLC circuit structure is not recommended to be adopted for the application with a wider output voltage regulation range.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: in order to solve the existing problems, the full-bridge direct-current converter for realizing the full-range soft switching is provided, the hysteresis bridge arm is connected with the auxiliary resonance bridge arm in parallel, and the soft switching of the hysteresis bridge arm can be realized in a wide input voltage range, a wide output voltage range and a full load range.
The technical scheme adopted by the invention is as follows:
a full-bridge direct current converter for realizing full-range soft switching comprises a full-bridge synchronous rectifier bridge and a rectifier side filter circuit; the positive output end and the negative output end of the full-bridge synchronous rectifier bridge are respectively connected with the positive output end and the negative output end of the full-bridge direct-current converter through a rectifier side filter circuit;
the full-bridge dc converter further includes: the system comprises a lag bridge arm, an auxiliary resonance bridge arm, a lead bridge arm, a resonance inductor L2 and a main power transformer T1; the lag bridge arm and the lead bridge arm respectively comprise two switching tubes; positive input ends of the lag bridge arm and the lead bridge arm are connected with a positive input end of the full-bridge direct-current converter, and negative input ends of the lag bridge arm and the lead bridge arm are connected with a negative input end of the full-bridge direct-current converter;
the input end of the resonant inductor L2 is connected with the output end of the hysteresis bridge arm, and the output end of the resonant inductor L2 is connected with the positive input end of the primary winding of the main power transformer T1; the negative input end of the primary winding of the main power transformer T1 is connected with the output end of the leading bridge arm, the positive output end of the secondary winding of the main power transformer T1 is connected with the positive input end of the full-bridge synchronous rectifier bridge, and the negative output end of the secondary winding of the main power transformer T1 is connected with the negative input end of the full-bridge synchronous rectifier bridge;
the auxiliary resonant bridge arm adopts a CLC star resonant network and comprises a resonant inductor L1, a resonant capacitor C2 and a resonant capacitor C3; one end of a resonant capacitor C2 is connected with a connection point between positive input ends of the lag bridge arm and the lead bridge arm, and the other end of the resonant capacitor C2 is connected with a connection point between negative input ends of the lag bridge arm and the lead bridge arm after passing through a resonant capacitor C3; the input end of the resonant inductor L1 is connected with the output end of the hysteresis bridge arm, and the output end of the resonant inductor L1 is connected with the connection point between the resonant capacitor C2 and the resonant capacitor C3.
Further, the full-bridge synchronous rectifier bridge comprises four switching tubes Q5, Q6, Q7 and Q8, wherein the switching tube Q5 and the switching tube Q7 are a first bridge arm of the full-bridge synchronous rectifier bridge, and the switching tube Q6 and the switching tube Q8 are a second bridge arm of the full-bridge synchronous rectifier bridge;
the connection point between the switching tube Q5 and the switching tube Q6 is the positive input end of the full-bridge synchronous rectifier bridge;
the connection point between the switching tube Q7 and the switching tube Q8 is the negative input end of the full-bridge synchronous rectifier bridge;
the connection point between the switching tube Q5 and the switching tube Q7 is the positive output end of the full-bridge synchronous rectifier bridge;
and the connection point between the switching tube Q6 and the switching tube Q8 is the negative output end of the full-bridge synchronous rectifier bridge.
Further, the rectification side filter circuit adopts an LC circuit and comprises an inductor L3 and a capacitor C4; the positive output end of full-bridge synchronous rectifier bridge connects the one end of electric capacity C4 and the positive output end of full-bridge DC converter through inductance L3, the negative output end of full-bridge synchronous rectifier bridge connects the other end of electric capacity C4 and the negative output end of full-bridge DC converter.
Further, the full-bridge dc converter further includes a voltage stabilizing capacitor C1 connected in parallel between the positive input terminal and the negative input terminal of the full-bridge dc converter.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
1. the full-bridge direct-current converter adopts the lag bridge arm to be connected with the auxiliary resonant bridge arm in parallel, and can realize the soft switching of the lag bridge arm in a wide input voltage range, a wide output voltage range and a full load range. Compared with the prior art, the auxiliary resonant bridge arm is added, so that the energy of the soft switch of the hysteresis bridge arm is only related to the energy of the auxiliary resonant bridge arm, and the energy of the auxiliary resonant bridge arm cannot be discharged to other places, therefore, the whole system does not have the problem of resonant circulation, and the soft switch of the hysteresis bridge arm can be realized under any condition.
2. The auxiliary resonant bridge arm adopts a CLC star-shaped resonant network, so that the energy is larger, the circuit is simpler, the resonant inductance L2 connected with the main power transformer in series can be reduced, the resonant energy is not influenced, the energy of the soft switch only flows between the auxiliary resonant bridge arm and the hysteresis bridge arm, the energy does not flow through the main power transformer and the full-bridge synchronous rectifier bridge, and the efficiency and the volume are more advantageous.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a circuit configuration diagram of a full-bridge dc converter for implementing full-range soft switching according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
The features and properties of the present invention are described in further detail below with reference to examples.
As shown in fig. 1, the full-bridge dc converter provided in this embodiment for implementing full-range soft switching includes a full-bridge synchronous rectifier bridge and a rectifier-side filter circuit; the positive output end and the negative output end of the full-bridge synchronous rectifier bridge are respectively connected with the positive output end and the negative output end of the full-bridge direct-current converter through a rectifier side filter circuit; in particular, the amount of the solvent to be used,
in one embodiment, the full-bridge synchronous rectifier bridge comprises four switching tubes Q5, Q6, Q7 and Q8, wherein the switching tube Q5 and the switching tube Q7 are a first bridge arm of the full-bridge synchronous rectifier bridge, and the switching tube Q6 and the switching tube Q8 are a second bridge arm of the full-bridge synchronous rectifier bridge;
a connection point a1 between the switching tube Q5 and the switching tube Q6 is a positive input end of the full-bridge synchronous rectifier bridge;
a connection point A2 between the switching tube Q7 and the switching tube Q8 is a negative input end of the full-bridge synchronous rectifier bridge;
a connection point A3 between the switching tube Q5 and the switching tube Q7 is a positive output end of the full-bridge synchronous rectifier bridge;
the connection point a4 between the switching tube Q6 and the switching tube Q8 is the negative output terminal of the full bridge synchronous rectifier bridge.
In one embodiment, the rectification side filter circuit adopts an LC circuit, and comprises an inductor L3 and a capacitor C4; the positive output end of the full-bridge synchronous rectifier bridge (i.e. the connection point A3 between the switch tube Q5 and the switch tube Q7) is connected with one end of the capacitor C4 and the positive output end VOUT + of the full-bridge dc converter through the inductor L3, and the negative output end of the full-bridge synchronous rectifier bridge (i.e. the connection point a4 between the switch tube Q6 and the switch tube Q8) is connected with the other end of the capacitor C4 and the negative output end VOUT-of the full-bridge dc converter.
The full-bridge dc converter further includes: the system comprises a lag bridge arm, an auxiliary resonance bridge arm, a lead bridge arm, a resonance inductor L2 and a main power transformer T1;
the delay bridge arm and the lead bridge arm respectively comprise two switching tubes, wherein the delay bridge arm comprises a switching tube Q1 and a switching tube Q2, and the lead bridge arm comprises a switching tube Q3 and a switching tube Q4; the positive input ends of the lag bridge arm and the lead bridge arm are connected with the positive input end Vin + of the full-bridge direct-current converter, and the negative input ends of the lag bridge arm and the lead bridge arm are connected with the negative input end Vin-of the full-bridge direct-current converter;
the input end of the resonant inductor L2 is connected with the output end of the hysteresis bridge arm, and the output end of the resonant inductor L2 is connected with the positive input end of the primary winding of the main power transformer T1; the negative input end of the primary winding of the main power transformer T1 is connected with the output end of the leading bridge arm, the positive output end of the secondary winding of the main power transformer T1 is connected with the positive input end of the full-bridge synchronous rectifier bridge (namely the connection point A1 between the switch tube Q5 and the switch tube Q6), and the negative output end of the secondary winding of the main power transformer T1 is connected with the negative input end of the full-bridge synchronous rectifier bridge (namely the connection point A2 between the switch tube Q7 and the switch tube Q8);
the auxiliary resonant bridge arm adopts a CLC star resonant network and comprises a resonant inductor L1, a resonant capacitor C2 and a resonant capacitor C3; one end of a resonant capacitor C2 is connected with a connection point B1 between the positive input ends of the lag bridge arm and the lead bridge arm, and the other end of the resonant capacitor C2 is connected with a connection point B2 between the negative input ends of the lag bridge arm and the lead bridge arm after passing through a resonant capacitor C3; the input end of the resonant inductor L1 is connected with the output end of the hysteresis bridge arm, and the output end of the resonant inductor L1 is connected with a connection point B3 between the resonant capacitor C2 and the resonant capacitor C3.
The input power supply is respectively connected with the input end Vin + and the negative input end Vin-of the full-bridge direct-current converter, and in order to provide stable input voltage, the full-bridge direct-current converter further comprises a voltage stabilizing capacitor C1 connected in parallel between the positive input end and the negative input end of the full-bridge direct-current converter.
In order to explain the working principle of the full-bridge direct-current converter, the full-bridge direct-current converter is controlled by adopting a DSP (digital signal processor) main controller and a PWM (pulse-width modulation) controller which are connected, wherein the bases of a switching tube Q1, a switching tube Q2, a switching tube Q3, a switching tube Q4, a switching tube Q5, a switching tube Q6, a switching tube Q7 and a switching tube Q8 are all connected to the PWM controller; simultaneously, the voltage at two ends of the measuring capacitor C1 is the input voltage of the full-bridge direct-current converter, the voltage at two ends of the measuring resonant capacitor C3 is the resonant voltage, the peak current at the input end of the measuring resonant inductor L2, the current at the output end of the measuring inductor L3 is the output current of the full-bridge direct-current converter, the voltage at two ends of the measuring capacitor C4 is the output voltage of the full-bridge direct-current converter, and the collected data are all transmitted to the DSP main controller.
The working principle of the full-bridge direct-current converter is as follows:
when the switching tube Q1 and the switching tube Q2 are used as a hysteresis bridge arm, the full-bridge dc converter only stores energy in the inductor L2 to provide soft switching of the switching tube Q1 and the switching tube Q when operating, but the current in the resonant inductor L2 is very small when the full-bridge dc converter is in actual power and is in light load, if enough energy still needs to be provided to realize the soft switching of the switching tube Q1 and the switching tube Q2 at the time, the resonant inductor L2 needs a sufficiently large inductance, but the inductance of the resonant inductor L2 is increased to increase the inductance volume and cost, and the turn ratio of the primary winding to the secondary winding of the main power transformer is increased due to the excessively large inductance of the resonant inductor L2, so the volume and loss of the main power transformer are increased.
Therefore, the auxiliary resonant bridge arm is connected in parallel with the hysteresis bridge arm, the resonant inductor L1, the resonant capacitor C2 and the resonant capacitor C3 of the auxiliary resonant bridge arm form a CLC star-shaped resonant network, the resonant energy of the CLC star-shaped resonant network is completely determined by the L1, the resonant capacitor C2, the resonant capacitor C3 and the switching frequency, the CLC star-shaped resonant network is completely unrelated to the input voltage, the output voltage and the load size of the full-bridge direct-current converter, so that the auxiliary resonant bridge arm is a completely independent system, the resonant parameters are calculated according to the required resonant energy, and the soft switching of the switching tube Q1 and the switching tube Q in the hysteresis bridge arm can be realized without considering any other problems, so that the control system.
Specifically, when the switching tube Q1 is turned on, the resonant capacitor C2 charges the resonant inductor L1 through the switching tube Q1, the current of the resonant inductor L1 gradually increases, when the switching tube Q1 is turned off, the freewheeling current of the resonant inductor L1 is turned on by the body diode of the switching tube Q2 to charge the resonant capacitor C3, and after the dead time, the switching tube Q2 is turned on to zero voltage; after the switching tube Q2 is switched on, the resonant capacitor C3 discharges the resonant inductor L1 through the switching tube Q2, the current of the resonant inductor L1 is reduced from positive to negative, when the switching tube Q2 is switched off, the freewheeling current of the resonant inductor L1 is conducted from the body diode of the switching tube Q1 to charge the resonant capacitor C2, when the switching tube Q1 is switched on to zero voltage after dead time, so that the soft switching of a lagging bridge arm is realized through the CLC star resonant network of the resonant inductor L1, the resonant capacitor C2 and the resonant capacitor C3, and the resonant network is only related to the resonant inductor L1, the resonant capacitor C2, the resonant capacitor C3 and the switching frequency, the control difficulty of the whole system is simplified, the soft switching of the lagging bridge arm can be realized under any condition, the magnitude of the resonant current and the magnitude of the resonant energy can be calculated according to the system switching frequency, the junction capacitance of the switching tube, and the dead time of the switching tube, the resonance energy can be calculated by the inductive reactance of the resonance inductor L1, the capacitive reactance of the resonance capacitor C2 and the resonance capacitor C3, so that the proper values of the resonance inductor L1, the resonance capacitor C2 and the resonance capacitor C3 can be calculated, and the energy of the resonance inductor L1 completely absorbs the energy of the capacitance between the switching tube Q1 and the switching tube Q2 in the dead time process. The calculation process is as follows:
in the process of resonance, the voltages of the resonance capacitor C2 and the resonance capacitor C3 are sinusoidal voltage waveforms which are alternately complementary, U (C2) + U (C3) is VIN, and VIN is an input direct-current voltage value. Setting the average voltage value of the resonant capacitor C2 and the resonant capacitor C3 as U, then U × T is L × I, L is the inductance of the resonant inductor L1, T is the turn-on time of the main topology MOS transistor, T is 1/F, F is the switching frequency of the system, and I is the current of the resonant inductor L1. Therefore, since U is 0.5 VIN, and the magnitude of the resonant inductor L1 needs to be calculated according to U is L di/dt, the change value Δ U of the resonant voltage U needs to be set first, generally, U is 20% VIN, VIN is a constant value, and a fixed resonant current value I is set, so that the inductance L of the resonant inductor L1 can be calculated, and the capacitance C is calculated according to Δ U ═ C × I T, T ═ 1/2T, and the capacitance C is the values of the resonant capacitor C2 and the resonant capacitor C3.
As can be seen from the above, the present invention has the following beneficial effects:
1. the full-bridge direct-current converter adopts the lag bridge arm parallel auxiliary resonant bridge arm, and can realize the soft switching of the lag bridge arm in a wide input voltage range, a wide output voltage range and a full load range: compared with the prior art, the auxiliary resonant bridge arm is added, so that the energy of the soft switch of the hysteresis bridge arm is only related to the energy of the auxiliary resonant bridge arm, and the energy of the auxiliary resonant bridge arm cannot be discharged to other places, therefore, the whole system does not have the problem of resonant circulation, and the soft switch of the hysteresis bridge arm can be realized under any condition.
2. The auxiliary resonant bridge arm adopts a CLC star-shaped resonant network, so that the energy is larger, the circuit is simpler, the resonant inductance L2 connected with the main power transformer in series can be reduced, the resonant energy is not influenced, the energy of the soft switch only flows between the auxiliary resonant bridge arm and the hysteresis bridge arm, the energy does not flow through the main power transformer and the full-bridge synchronous rectifier bridge, and the efficiency and the volume are more advantageous.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (3)
1. A full-bridge direct current converter for realizing full-range soft switching comprises a full-bridge synchronous rectifier bridge and a rectifier side filter circuit; the positive output end and the negative output end of the full-bridge synchronous rectifier bridge are respectively connected with the positive output end and the negative output end of the full-bridge direct-current converter through a rectifier side filter circuit; it is characterized in that the preparation method is characterized in that,
the full-bridge dc converter further includes: the system comprises a lag bridge arm, an auxiliary resonance bridge arm, a lead bridge arm, a resonance inductor L2 and a main power transformer T1; the lag bridge arm and the lead bridge arm respectively comprise two switching tubes; positive input ends of the lag bridge arm and the lead bridge arm are connected with a positive input end of the full-bridge direct-current converter, and negative input ends of the lag bridge arm and the lead bridge arm are connected with a negative input end of the full-bridge direct-current converter;
the input end of the resonant inductor L2 is connected with the output end of the hysteresis bridge arm, and the output end of the resonant inductor L2 is connected with the positive input end of the primary winding of the main power transformer T1; the negative input end of the primary winding of the main power transformer T1 is connected with the output end of the leading bridge arm, the positive output end of the secondary winding of the main power transformer T1 is connected with the positive input end of the full-bridge synchronous rectifier bridge, and the negative output end of the secondary winding of the main power transformer T1 is connected with the negative input end of the full-bridge synchronous rectifier bridge;
the auxiliary resonant bridge arm adopts a CLC star resonant network and comprises a resonant inductor L1, a resonant capacitor C2 and a resonant capacitor C3; one end of a resonant capacitor C2 is connected with a connection point between positive input ends of the lag bridge arm and the lead bridge arm, and the other end of the resonant capacitor C2 is connected with a connection point between negative input ends of the lag bridge arm and the lead bridge arm after passing through a resonant capacitor C3; the input end of the resonant inductor L1 is connected with the output end of the hysteresis bridge arm, and the output end of the resonant inductor L1 is connected with the connection point between the resonant capacitor C2 and the resonant capacitor C3;
the full-bridge synchronous rectifier bridge comprises four switching tubes Q5, Q6, Q7 and Q8, wherein the switching tube Q5 and the switching tube Q7 are a first bridge arm of the full-bridge synchronous rectifier bridge, and the switching tube Q6 and the switching tube Q8 are a second bridge arm of the full-bridge synchronous rectifier bridge;
the connection point between the switching tube Q5 and the switching tube Q6 is the positive input end of the full-bridge synchronous rectifier bridge;
the connection point between the switching tube Q7 and the switching tube Q8 is the negative input end of the full-bridge synchronous rectifier bridge;
the connection point between the switching tube Q5 and the switching tube Q7 is the positive output end of the full-bridge synchronous rectifier bridge;
the connection point between the switching tube Q6 and the switching tube Q8 is the negative output end of the full-bridge synchronous rectifier bridge;
the four switching tubes Q5, Q6, Q7 and Q8 and the two switching tubes of the lag bridge arm and the lead bridge arm are all controlled by the same PWM controller;
the process of calculating the values of the resonant inductance L1, the resonant capacitance C2 and the resonant capacitance C3 is as follows: in the resonance process, the voltages of the resonance capacitor C2 and the resonance capacitor C3 are sinusoidal voltage waveforms which are alternately complementary, U (C2) + U (C3) is VIN, and VIN is an input direct-current voltage value; setting the average voltage value of the resonant capacitor C2 and the resonant capacitor C3 as U, where U × T is L × I, L is an inductance of the resonant inductor L1, T is an on-time of the main topology MOS transistor, T is 1/F, F is a switching frequency of the system, and I is a current of the resonant inductor L1; therefore, since U is 0.5 VIN, and the magnitude of the resonant inductance L1 is calculated according to U is L di/dt, it is necessary to set the change value Δ U of the resonant voltage U, select U is 20% VIN, and VIN is a constant value, and set a fixed resonant current value I, thereby calculating the inductance L of the resonant inductance L1, and calculate the capacitance C according to Δ U is C × I T, and T is 1/2T, which is the values of the resonant capacitance C2 and the resonant capacitance C3.
2. The full-bridge direct-current converter for realizing the full-range soft switching according to claim 1, wherein the rectifying side filter circuit adopts an LC circuit, and comprises an inductor L3 and a capacitor C4; the positive output end of full-bridge synchronous rectifier bridge connects the one end of electric capacity C4 and the positive output end of full-bridge DC converter through inductance L3, the negative output end of full-bridge synchronous rectifier bridge connects the other end of electric capacity C4 and the negative output end of full-bridge DC converter.
3. The full-bridge DC converter for realizing full-range soft switching of claim 1, further comprising a voltage stabilizing capacitor C1 connected in parallel between the positive input terminal and the negative input terminal of the full-bridge DC converter.
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| CN201911390652.XA CN111130355B (en) | 2019-12-30 | 2019-12-30 | Full-bridge direct-current converter for realizing full-range soft switching |
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| CN111130355A CN111130355A (en) | 2020-05-08 |
| CN111130355B true CN111130355B (en) | 2021-05-04 |
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| CN (1) | CN111130355B (en) |
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| US5781419A (en) * | 1996-04-12 | 1998-07-14 | Soft Switching Technologies, Inc. | Soft switching DC-to-DC converter with coupled inductors |
| CN102857106A (en) * | 2011-06-30 | 2013-01-02 | 上海空间电源研究所 | Zero-voltage switching full-bridge direct-current converter utilizing passive auxiliary circuit |
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| CN107437892A (en) * | 2017-07-31 | 2017-12-05 | 华为技术有限公司 | A kind of power supply changeover device and its control method |
| CN110299847A (en) * | 2019-06-06 | 2019-10-01 | 湖州顺为能源科技有限公司 | The phase shifting full bridge soft switch circuit of the shutdown of inductance auxiliary and loop current suppression |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101202507A (en) * | 2007-12-11 | 2008-06-18 | 株洲南车时代电气股份有限公司 | New type phase shifting full bridge soft switch converter |
| CN101604917A (en) * | 2009-06-24 | 2009-12-16 | 南京航空航天大学 | Zero-Voltage Switching Full-Bridge DC Converter Using Passive Auxiliary Network |
| US10356861B2 (en) * | 2017-04-04 | 2019-07-16 | Osram Sylvania Inc. | Constant output current LED driver |
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| US5781419A (en) * | 1996-04-12 | 1998-07-14 | Soft Switching Technologies, Inc. | Soft switching DC-to-DC converter with coupled inductors |
| CN102857106A (en) * | 2011-06-30 | 2013-01-02 | 上海空间电源研究所 | Zero-voltage switching full-bridge direct-current converter utilizing passive auxiliary circuit |
| CN107284273A (en) * | 2017-07-11 | 2017-10-24 | 深圳市永联科技股份有限公司 | A kind of Vehicular charger main circuit of integrated DC/DC converters and its control |
| CN107437892A (en) * | 2017-07-31 | 2017-12-05 | 华为技术有限公司 | A kind of power supply changeover device and its control method |
| CN110299847A (en) * | 2019-06-06 | 2019-10-01 | 湖州顺为能源科技有限公司 | The phase shifting full bridge soft switch circuit of the shutdown of inductance auxiliary and loop current suppression |
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| CN111130355A (en) | 2020-05-08 |
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