CN112366944B - Soft switch resonance BOOST converter controlled by pulse width modulation - Google Patents
Soft switch resonance BOOST converter controlled by pulse width modulation Download PDFInfo
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- CN112366944B CN112366944B CN202011398200.9A CN202011398200A CN112366944B CN 112366944 B CN112366944 B CN 112366944B CN 202011398200 A CN202011398200 A CN 202011398200A CN 112366944 B CN112366944 B CN 112366944B
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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
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
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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
-
- 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
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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
Abstract
The invention discloses a soft-switching resonance BOOST converter controlled by pulse width modulation; the power supply comprises an input voltage source Vin and an output load Rload, wherein the output voltage of the output load Rload is defined as output voltage Vo, and the power supply comprises an input filter capacitor C1, a BOOST main switch upper tube S1, a BOOST main switch lower tube S2, a BOOST inductor L1, a resonant diode D1, an auxiliary freewheeling diode D2, a resonant capacitor Cr and an output filter capacitor Co; the invention adds two auxiliary diodes and one resonant capacitor, provides soft switching conditions for the main switching devices and all auxiliary diodes of the BOOST by utilizing the resonance work of the BOOST inductor and the resonant capacitor, and can realize the soft switching of all switching devices in a full range, thereby realizing the high frequency and high efficiency of a circuit, and simultaneously remarkably reducing the control complexity and the number of power devices, thereby improving the reliability and the robustness of the switching power supply product.
Description
Technical Field
The invention belongs to the technical field of switching power supplies, and particularly relates to a soft switching resonance BOOST converter controlled by pulse width modulation.
Background
The BOOST converter is one of the most basic circuit topologies in the power electronics disciplines, is widely used in the field of switching power supplies, and particularly has been greatly popularized in recent years along with the wide application of a power factor correction circuit in an ACDC switching power supply. Within the power electronics discipline, there are a number of patent and scientific literature analyzing and discussing soft switching techniques for BOOST circuits, and many solutions have been proposed. Two main current soft switching methods of the BOOST converter are adopted, one method adopts a combination of a plurality of passive devices, and soft switching conditions are provided for a main switching device of the BOOST by using auxiliary inductance and capacitance resonance modes; the other type adopts the combination of an auxiliary switching tube, an inductor and a capacitor, and soft switching conditions are provided for a main switching device of the BOOST by using a mode of resonance of the auxiliary switching tube, the inductor and the capacitor.
The soft switching BOOST converter adopting the combination of a plurality of passive devices has a complex circuit structure, and due to the existence of a resonant circuit, when the converter works in transient changes such as switching on and off, overcurrent and short circuit, the problems of disappearance of soft switching conditions, exceeding of stress and the like exist, and the circuit is difficult to optimally design and apply and manufacture practical products.
The soft-switching BOOST converter adopting the combination of the auxiliary switching tube, the inductor and the capacitor has the advantages that the circuit structure is simple, and the circuit characteristic is stable; however, in order to realize soft switching of the main switching device, an auxiliary switching tube needs to be added, and control of the auxiliary switching tube is provided, a special controller is needed, or an auxiliary control circuit is added, so that workload of product design is increased, difficulty is brought to popularization of a technical scheme, and various problems still exist in various BOOST converters on the market.
Although the circuit and the power converter of the multilevel topology disclosed in the grant publication CN105827129B realize that the voltage withstand value required by the switch component is low, so that the performance can be ensured, and the cost of the switch component with low voltage withstand value is low, the problem that the main switch device and all auxiliary diodes of the existing BOOST cannot realize soft switch conditions, cannot reduce the complexity of control and reduce the number of power devices is not solved, and therefore, we propose a soft switch resonant BOOST converter adopting pulse width modulation control.
Disclosure of Invention
The present invention is directed to a soft-switching resonant BOOST converter employing pwm control to solve the above-mentioned problems.
In order to achieve the above purpose, the present invention provides the following technical solutions: the utility model provides an adopt soft-switching resonance BOOST converter of pulse width modulation control, includes input voltage source Vin, output load Rload, output voltage definition of output load Rload is output voltage Vo, its characterized in that: the positive electrode of the input voltage source Vin is electrically connected with the anode of the resonance diode D1, the cathode of the resonance diode D1 is electrically connected with the anode of the auxiliary freewheeling diode D2, an output load Rload is electrically connected between the cathode of the auxiliary freewheeling diode D2 and the cathode of the input voltage source Vin, one side of the auxiliary freewheeling diode D2 is electrically connected with a BOOST main switch upper tube S1 and a BOOST main switch lower tube S2, a BOOST inductor L1 is electrically connected between the BOOST main switch upper tube S1 and the BOOST main switch lower tube S2, the other end of the BOOST inductor L1 is electrically connected between the resonance diode D1 and the auxiliary freewheeling diode D2, the positive electrode of the input voltage source Vin is electrically connected with an input filter capacitor C1, the other end of the input filter capacitor C1 is electrically connected with the cathode of the input voltage source Vin, one end of the resonance diode D1 is electrically connected with a resonance capacitor Cr, the other end of the resonance capacitor Cr is electrically connected with one end of the output filter capacitor of the output load Co, and the other end of the resonance capacitor is electrically connected with the output capacitor of the output load.
Preferably, the resonance capacitor Cr is connected in parallel with the resonance diode D1.
Preferably, the cathode of the auxiliary freewheeling diode D2 is electrically connected to the drain of the BOOST main switch upper tube S1.
Preferably, the output filter capacitor Co is connected in parallel with the output load Rload.
Preferably, the source electrode of the BOOST main switch upper tube S1 is electrically connected to the drain electrode of the BOOST main switch lower tube S2.
Preferably, the source electrode of the BOOST main switch down tube S2 is electrically connected to the negative electrode of the input voltage source Vin and the negative electrode of the output filter capacitor Co.
Preferably, the drain electrode of the BOOST main switch upper tube S1 is electrically connected with the positive electrode of the input voltage source Vin.
Preferably, the cathode of the resonant diode D1 is electrically connected to the positive terminal of the output filter capacitor Co, i.e. the positive terminal of the output load Rload.
Preferably, each working period of the soft switching resonance BOOST converter controlled by pulse width modulation is composed of 8 modes when the soft switching resonance BOOST converter is in operation.
Preferably, when the soft switching resonant BOOST converter adopting pulse width modulation control starts to operate in resonance, the current of the BOOST inductor L1 is zero, the voltage of the resonant capacitor Cr is zero, and when the resonance operation is finished, the voltage of the resonant capacitor Cr is Vo-Vin, i.e. the energy on the resonant capacitor Cr is equal to the energy stored in the BOOST inductor L1. As can be seen from the basic circuit knowledge, the reverse current Ix on the BOOST inductor L1 can be calculated by the following formula:
therefore, the magnitude of the reverse current of the BOOST inductor L1 is determined only by the voltage difference between the input and output voltages, the inductance of the BOOST inductor L1 and the capacitance of the resonant capacitor Cr, and the magnitude of the reverse current of the BOOST inductor L1 can be optimized by adjusting the parameters of the BOOST inductor L1 and the resonant capacitor Cr under the condition that the input and output voltages are known and the range is fixed.
Compared with the prior art, the invention has the beneficial effects that:
the invention adds two auxiliary diodes and one resonance capacitor, and provides soft switching conditions for the main switching device of the BOOST and all auxiliary diodes by utilizing resonance work of the BOOST inductor and the resonance capacitor, and the converter can adopt the traditional pulse width modulation mode to control because the resonance circuit only works at the moment of switching on and off the main switching device of the BOOST converter, the control mode is mature and simple, and soft switching of all switching devices in a full range can be realized, thereby realizing high frequency and high efficiency of the circuit, simultaneously obviously reducing the control complexity and the quantity of power devices, and improving the reliability and the robustness of the switching power supply product.
Drawings
FIG. 1 is a schematic diagram of a system circuit structure according to the present invention;
FIG. 2 is a circuit diagram of a conventional BOOST converter according to the present invention;
FIG. 3 is a main operating waveform of the power converter of the present invention;
FIG. 4 is a schematic diagram of a primary mode 0 of operation of the power converter of the present invention;
FIG. 5 is a schematic diagram of a primary mode 1 of operation of the power converter of the present invention;
FIG. 6 is a schematic diagram of the primary mode 2 of operation of the power converter of the present invention;
FIG. 7 is a schematic diagram of the primary mode 3 of operation of the power converter of the present invention;
FIG. 8 is a schematic diagram of a primary mode 4 of operation of the power converter of the present invention;
FIG. 9 is a schematic diagram of a primary mode 5 of operation of the power converter of the present invention;
FIG. 10 is a schematic diagram of a primary mode 6 of operation of the power converter of the present invention;
fig. 11 is a schematic diagram of a main operation mode 7 of the power converter of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1, the present invention provides a technical solution: the utility model provides an adopt soft-switching resonance BOOST converter of pulse width modulation control, includes input voltage source Vin, output load Rload, output voltage definition of output load Rload is output voltage Vo, its characterized in that: the positive electrode of the input voltage source Vin is electrically connected with the anode of the resonance diode D1, the cathode of the resonance diode D1 is electrically connected with the anode of the auxiliary freewheeling diode D2, an output load Rload is electrically connected between the cathode of the auxiliary freewheeling diode D2 and the cathode of the input voltage source Vin, one side of the auxiliary freewheeling diode D2 is electrically connected with a BOOST main switch upper tube S1 and a BOOST main switch lower tube S2, a BOOST inductor L1 is electrically connected between the BOOST main switch upper tube S1 and the BOOST main switch lower tube S2, the other end of the BOOST inductor L1 is electrically connected between the resonance diode D1 and the auxiliary freewheeling diode D2, the positive electrode of the input voltage source Vin is electrically connected with an input filter capacitor C1, the other end of the input filter capacitor C1 is electrically connected with the cathode of the input voltage source Vin, one end of the resonance diode D1 is electrically connected with a resonance capacitor Cr, the other end of the resonance capacitor Cr is electrically connected with one end of the output filter capacitor of the output load Co, and the other end of the resonance capacitor is electrically connected with the output capacitor of the output load.
In order to implement the resonance processing of the circuit, in this embodiment, it is preferable that the resonance capacitor Cr is connected in parallel with the resonance diode D1.
In order to realize control and regulation of the circuit, in this embodiment, preferably, the cathode of the auxiliary freewheeling diode D2 is electrically connected to the drain of the BOOST main switch upper tube S1.
In order to implement the filtering process on the output circuit, in this embodiment, the output filter capacitor Co is preferably connected in parallel with the output load Rload.
In order to realize the cooperative operation control adjustment of the two sets of switches, in this embodiment, preferably, the source electrode of the upper BOOST switch tube S1 is electrically connected to the drain electrode of the lower BOOST switch tube S2.
For soft switching control adjustment, in this embodiment, preferably, the source of the BOOST main switch lower tube S2 is electrically connected to the negative electrode of the input voltage source Vin and the negative electrode of the output filter capacitor Co.
In order to form a closed loop, in this embodiment, preferably, the drain of the BOOST main switch upper tube S1 is electrically connected to the positive electrode of the input voltage source Vin.
In order to realize power supply output to the output load Rload, in this embodiment, preferably, the cathode of the resonant diode D1 is electrically connected to the positive terminal of the output filter capacitor Co, that is, the positive terminal of the output load Rload.
In order to achieve clear analysis, in this embodiment, it is preferable that each working period of the soft-switching resonant BOOST converter controlled by pulse width modulation is composed of 8 modes.
In order to optimize the efficiency of the converter, in this embodiment, preferably, when the soft-switching resonant BOOST converter adopting pulse width modulation control starts to operate in resonance, the current of the BOOST inductor L1 is zero, the voltage of the resonant capacitor Cr is zero, and when the resonant operation ends, the voltage of the resonant capacitor Cr is Vo-Vin, that is, the energy on the resonant capacitor Cr is equal to the energy stored in the BOOST inductor L1. As can be seen from the basic circuit knowledge, the reverse current Ix on the BOOST inductor L1 can be calculated by the following formula:
therefore, the magnitude of the reverse current of the BOOST inductor L1 is determined only by the voltage difference between the input and output voltages, the inductance of the BOOST inductor L1 and the capacitance of the resonant capacitor Cr, and the magnitude of the reverse current of the BOOST inductor L1 can be optimized by adjusting the parameters of the BOOST inductor L1 and the resonant capacitor Cr under the condition that the input and output voltages are known and the range is fixed.
With reference to figures 3-11 of the drawings,
as shown in fig. 3, each working period of the soft-switching resonant BOOST converter controlled by pulse width modulation is composed of 8 modes, and is described below according to the working modes.
Modality 0: before time t0, as shown in fig. 4, the BOOST main switch down tube S2 and the resonant diode D1 are turned on, the input voltage Vin acts on two ends of the BOOST inductor L1, and the current of the BOOST inductor L1 increases linearly.
Modality 1: at time t0, as shown in fig. 5, the BOOST main switch lower tube S2 is turned off, and because the current of the BOOST inductor L1 cannot be suddenly changed, the BOOST inductor L1 charges parasitic capacitance of the BOOST main switch lower tube S2 and discharges parasitic capacitance of the BOOST main switch upper tube S1, and compared with the BOOST inductor L1, the parasitic capacitance of the BOOST main switch upper tube S1 and the BOOST main switch lower tube S2 is very small, and the current change of the BOOST inductor L1 during the process of flushing and discharging the parasitic capacitance of the BOOST main switch upper tube S1 and the BOOST main switch lower tube S2 is negligible, so that the voltage at two ends of the BOOST main switch upper tube S1 can be considered to be linearly reduced, and the voltage at two ends of the BOOST main switch lower tube S2 can be considered to be linearly increased until the time t 1.
Modality 2: at time t1, as shown in fig. 6, the voltages at two ends of the upper tube S1 of the BOOST main switch are reduced to zero, the parasitic diode of the upper tube S1 of the BOOST main switch is conducted, and the voltage of the upper tube S1 of the BOOST main switch is clamped at zero; when the parasitic diode of the BOOST main switch lower tube S2 is conducted, current of the BOOST inductor L1 flows through the resonant diode D1 and the BOOST main switch upper tube S1, voltage at two ends of the BOOST inductor L1 is Vin-Vo, and the current of the BOOST inductor L1 linearly drops under the action of the voltage until the moment t2 drops to zero. Since the Voltage across the BOOST main switch upper tube S1 is always Zero between time t1 and time t2, the BOOST main switch lower tube S2 is turned on during this period to Zero Voltage on (ZVS).
Modality 3: at time t2, as shown in fig. 7, the Current of the boost inductor L1 drops to Zero, and the resonant diode D1 is naturally turned off, which is Zero-Current-Switching (ZCS). The output voltage is maintained by the stored energy on the output filter capacitor Co. After the resonant diode D1 is turned off, the upper voltage of the resonant capacitor Cr is still equal to zero, and because the upper tube S1 of the BOOST main switch is in an on state at the moment, the voltage at two ends of the BOOST inductor L1 is Vin-Vo, under the action of the voltage, the BOOST inductor L1 and the resonant capacitor Cr work in a resonant mode, the current of the BOOST inductor L1 is reversely resonant and increased, the voltage of the resonant capacitor Cr is increased to Vo-Vin at the moment t3, the auxiliary freewheeling diode D2 is turned on, and the voltage of the resonant capacitor Cr is clamped to Vo-Vin.
Modality 4: at time t3, as shown in fig. 8, the auxiliary freewheeling diode D2 is turned on, and the current of the BOOST inductor L1 flows through the auxiliary freewheeling diode D2 and the BOOST main switch upper tube S1, so that considering that the voltage drop on the auxiliary freewheeling diodes D2 and S1 is low, the influence of the voltage drop on the auxiliary freewheeling diode D2 and the BOOST main switch upper tube S1 on the current of the BOOST inductor L1 is ignored, and the current of the BOOST inductor L1 remains unchanged until time t 4.
Modality 5: at time t4, as shown in fig. 9, the BOOST main switch upper tube S1 is turned off, because the current of the BOOST inductor L1 cannot be suddenly changed, the parasitic capacitance of the BOOST main switch lower tube S2 is discharged by the inductor current, and the parasitic capacitance of the BOOST main switch upper tube S1 is charged, compared with the BOOST inductor L1, the parasitic capacitance of the BOOST main switch upper tube S1 and the BOOST main switch lower tube S2 is very small, and the current change of the BOOST inductor L1 in the process of punching and discharging is negligible, so that the voltage at the two ends of the BOOST main switch lower tube S2 can be considered to be linearly reduced, and the voltage at the two ends of the BOOST main switch upper tube S1 can be linearly increased in the process until the time t 5.
Modality 6: at time t5, as shown in fig. 10, the voltage across the lower BOOST switch tube S2 is linearly reduced to zero, and the parasitic diode of the lower BOOST switch tube S2 is turned on, so as to clamp the voltage of the lower BOOST switch tube S2 at zero. At this time, the current of the BOOST inductor L1 flows through the auxiliary freewheeling diode D2, the output filter capacitor Co, and the BOOST main switch lower tube S2, the voltage at two ends of the BOOST inductor L1 is equal to the output voltage, and under the action of this voltage, the current of the BOOST inductor L1 decreases linearly until the time t6 drops to zero. And between the time t5 and the time t6, the voltage at the two ends of the upper tube S1 of the BOOST main switch is always zero, and the upper tube S1 of the BOOST main switch is turned on at zero voltage in the period.
Modality 7: at time t6, as shown in fig. 11, the current of the boost inductor L1 decreases linearly to zero, and the auxiliary freewheeling diode D2 turns off naturally, and turns off at zero current; when the auxiliary freewheeling diode D2 is turned off, the upper voltage of Cr is Vo-Vin, and because the BOOST main switch lower tube S2 is in an on state at this time, the BOOST inductor L1 and the resonant capacitor Cr work in a resonance mode under the excitation of the input voltage Vin, the current resonance of the BOOST inductor L1 is increased, the voltage resonance of the resonant capacitor Cr is reduced, the voltage of the resonant capacitor Cr is reduced to zero until the time t7, the resonant diode D1 is turned on, and the voltage of the resonant capacitor Cr is clamped to zero.
After the resonance diode D1 is conducted, the lower tube S2 of the BOOST main switch and the resonance diode D1 are conducted simultaneously, input voltage acts on two ends of the BOOST inductor L1, the current of the BOOST inductor L1 is increased linearly, the converter works in a mode 0, and the converter enters the next switching period.
With reference to figures 1 and 2 of the drawings,
when the main switch upper pipe of the traditional BOOST converter is turned off, the soft switch can be realized by utilizing the energy of the BOOST inductor, so that the soft switch of the BOOST converter is mainly turned off by the main switch of the converter; from the above analysis, the key of the soft switching resonant BOOST converter adopting pulse width modulation control provided by the invention to realize soft switching of all switching devices is that the resonant capacitor Cr and the BOOST inductor L1 generate reverse current on the BOOST inductor L1 during resonance, and the reverse current needs to be large enough to discharge the voltage at two ends of the S2 to zero before the S2 is turned on, so as to realize zero-voltage turn-on of the S2; meanwhile, the reverse current on the BOOST inductor L1 generates additional conduction loss in the mode 4, i.e. between the time t3 and the time t 4; therefore, the reverse current on the BOOST inductor L1 should not be excessive. From analysis, in the mode 5, the BOOST inductor L1 and the resonant capacitor Cr are in resonance operation, when the resonance operation starts, the current of the BOOST inductor L1 is zero, the voltage of the resonant capacitor Cr is zero, and when the resonance operation ends, the voltage of the resonant capacitor Cr is Vo-Vin, namely the energy on the resonant capacitor Cr is equal to the energy stored by the BOOST inductor L1. As can be seen from the basic circuit knowledge, the reverse current Ix on the BOOST inductor L1 can be calculated by the following formula:
therefore, the magnitude of the reverse current of the BOOST inductor L1 is determined only by the input and output voltage difference, the inductance of the BOOST inductor L1 and the capacitance of the resonant capacitor Cr, and under the condition that the input and output voltages are known and the range is fixed, the magnitude of the reverse current of the BOOST inductor L1 can be optimized by adjusting the parameters of the BOOST inductor L1 and the resonant capacitor Cr, so that the efficiency of the converter is optimized.
In order to improve efficiency and switching frequency, reverse recovery diode-free devices such as schottky diodes or SiC diodes are commonly used in high frequency switching power supplies; siC diodes are widely used in many high voltage input applications because of their high withstand voltage and no reverse recovery. However, the conduction voltage drop of SiC diodes is large, typically 1.8V, and some devices have a conduction voltage drop even up to 3V under high temperature conditions, resulting in very large conduction losses. The soft switching resonant BOOST converter adopting pulse width modulation control provided by the invention has the advantages that all diode devices are turned off with zero current, so that the loss caused by reverse recovery is not required to be worried, and a Schottky diode or a SiC diode without reverse recovery is not required to be adopted in high-frequency application. The conducting voltage drop of the conventional ultra-fast recovery diode is about 1.2V under the high temperature condition, and compared with a SiC diode, the conducting loss of the conventional ultra-fast recovery diode is greatly reduced.
When the auxiliary diode of the soft switching resonance BOOST converter controlled by pulse width modulation uses a conventional ultrafast recovery diode, the parasitic capacitance and reverse recovery current of the ultrafast recovery diode can play the same role as the resonance capacitance Cr, namely, the parasitic capacitance and reverse recovery characteristic of the auxiliary diode are utilized to enable the BOOST inductor L1 to generate reverse current; because the auxiliary diode uses a conventional ultrafast recovery diode and utilizes the parasitic capacitance and reverse recovery characteristic of the auxiliary diode, the capacitance value of the resonance capacitor Cr of the soft switching resonance BOOST converter controlled by pulse width modulation can be greatly reduced, and even in part of the design, the resonance capacitor Cr can be omitted by optimizing the design, so that the complexity of a converter circuit is further reduced.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. The utility model provides an adopt soft-switching resonance BOOST converter of pulse width modulation control, includes input voltage source Vin, output load Rload, output voltage definition of output load Rload is output voltage Vo, its characterized in that: the positive electrode of the input voltage source Vin is electrically connected with the anode of the resonance diode D1, the cathode of the resonance diode D1 is electrically connected with the anode of the auxiliary freewheeling diode D2, an output load Rload is electrically connected between the cathode of the auxiliary freewheeling diode D2 and the cathode of the input voltage source Vin, the cathode of the auxiliary freewheeling diode D2 is electrically connected with a BOOST main switch upper tube S1 and a BOOST main switch lower tube S2, a BOOST inductor L1 is electrically connected between the BOOST main switch upper tube S1 and the BOOST main switch lower tube S2, the other end of the BOOST inductor L1 is electrically connected between the resonance diode D1 and the auxiliary freewheeling diode D2, an input filter capacitor C1 is electrically connected between the cathode of the input voltage source Vin, one end of the resonance diode D1 is electrically connected with a resonance capacitor Cr, the other end of the resonance capacitor Cr is electrically connected with one end of the output filter capacitor r load, and the other end of the resonance capacitor is electrically connected with the output load of the output capacitor Co.
2. A soft-switching resonant BOOST converter employing pulse width modulation control as claimed in claim 1, wherein: the cathode of the auxiliary freewheeling diode D2 is electrically connected to the drain of the upper tube S1 of the BOOST main switch.
3. A soft-switching resonant BOOST converter employing pulse width modulation control as claimed in claim 1, wherein: the source electrode of the upper BOOST switch tube S1 is electrically connected with the drain electrode of the lower BOOST switch tube S2.
4. A soft-switching resonant BOOST converter employing pulse width modulation control as claimed in claim 1, wherein: the source electrode of the BOOST main switch down tube S2 is electrically connected with the negative electrode of the input voltage source Vin and the negative end of the output filter capacitor Co.
5. A soft-switching resonant BOOST converter employing pulse width modulation control as claimed in claim 1, wherein: the drain electrode of the BOOST main switch upper tube S1 is electrically connected with the positive end of the output filter capacitor Co, i.e. the positive end of the output load Rload.
6. A soft-switching resonant BOOST converter employing pulse width modulation control as claimed in claim 1, wherein: the cathode of the auxiliary freewheeling diode D2 is electrically connected to the positive terminal of the output filter capacitor Co, i.e., the positive terminal of the output load Rload.
7. A soft-switching resonant BOOST converter employing pulse width modulation control as claimed in claim 1, wherein: each working period of the soft switching resonance BOOST converter controlled by pulse width modulation is composed of 8 modes when the soft switching resonance BOOST converter works.
8. A soft-switching resonant BOOST converter employing pulse width modulation control as claimed in claim 1, wherein: when the resonance work starts, the current of the BOOST inductor L1 is zero, the voltage of the resonance capacitor Cr is zero, and when the resonance work ends, the voltage of the resonance capacitor Cr is Vo-Vin, namely the energy on the resonance capacitor Cr is equal to the energy stored by the BOOST inductor L1, and the reverse current Ix on the BOOST inductor L1 can be calculated by the following formula:
therefore, the magnitude of the reverse current of the BOOST inductor L1 is determined only by the voltage difference between the input and output voltages, the inductance of the BOOST inductor L1 and the capacitance of the resonant capacitor Cr, and the magnitude of the reverse current of the BOOST inductor L1 can be optimized by adjusting the parameters of the BOOST inductor L1 and the resonant capacitor Cr under the condition that the input and output voltages are known and the range is fixed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011398200.9A CN112366944B (en) | 2020-12-03 | 2020-12-03 | Soft switch resonance BOOST converter controlled by pulse width modulation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011398200.9A CN112366944B (en) | 2020-12-03 | 2020-12-03 | Soft switch resonance BOOST converter controlled by pulse width modulation |
Publications (2)
| Publication Number | Publication Date |
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| CN112366944A CN112366944A (en) | 2021-02-12 |
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| CN1246747A (en) * | 1998-08-31 | 2000-03-08 | 深圳市华为电气股份有限公司 | Topologic circuit of DC-DC soft switch power change |
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| CN111614253A (en) * | 2020-04-27 | 2020-09-01 | 驰驱电气(嘉兴)有限公司 | Quasi-resonant motor driving topological circuit |
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| TWI271918B (en) * | 2004-05-31 | 2007-01-21 | Delta Electronics Inc | Soft-switching DC/DC converter having relatively less components |
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| CN105703616A (en) * | 2014-11-28 | 2016-06-22 | 姚秋丽 | PFC soft switch topology applied to BOOST circuit |
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