CN115864859B - Novel PWM control soft switch half-bridge DC-DC converter - Google Patents
Novel PWM control soft switch half-bridge DC-DC converter Download PDFInfo
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Abstract
The invention discloses a novel PWM control soft switch half-bridge DC-DC converter which comprises an input power supply module, an auxiliary switch bridge arm circuit, a resonant network, a half-bridge main circuit, a main circuit output loop and a resonant network output loop, wherein the auxiliary switch bridge arm circuit is used for controlling the connection and disconnection of the resonant network, the resonant network resonates to realize the soft switching of a main loop and an auxiliary loop switching tube, the high-frequency switching loss is reduced, and meanwhile, the resonant network is used as an independent output end, so that the working efficiency of the circuit is increased.
Description
Technical Field
The invention relates to the technical field of power electronics, in particular to a novel PWM control soft switch half-bridge DC-DC converter.
Background
With the continuous progress of society, power electronics technology has been rapidly developed, and research on DC-DC converters is also becoming more and more intensive, and how to reduce switching losses generated when the converters are switched at high frequencies is also becoming a key research problem. LLC and phase-shifting full bridge are used as soft switching DC-DC converter which is more mature in research, the control mode is more complex than pulse width modulation, meanwhile, the energy loss on resonant inductance in LLC is larger, PWM control DC-DC converter is simple in control mode than LLC and phase-shifting full bridge, but the switching tube in traditional PWM control half-bridge circuit can generate larger switching loss.
Disclosure of Invention
In order to solve the problems in the prior art, the invention aims to provide a PWM-controlled soft switching half-bridge DC-DC converter, which uses pulse width modulation and has a simple control mode, soft switching of all switching tubes is realized by controlling the connection and disconnection of a resonant network through a newly added auxiliary bridge arm, and meanwhile, the output of a resonant circuit is used as an independent output end to transfer the energy of the resonant circuit to a secondary side, so that the working efficiency of a circuit is improved.
In order to solve the technical problems, the invention adopts the following technical scheme: a novel PWM control soft switch half-bridge DC-DC converter comprises an input power supply module, an auxiliary switch bridge arm circuit, a resonance network, a half-bridge main circuit, a main circuit output loop and a vibration network output loop;
the input power supply module is used for realizing the input of direct-current voltage and the filtering of the input voltage;
the auxiliary switch bridge arm circuit is used for controlling the connection and disconnection of the resonant network;
the resonance network is used for realizing soft switching of the auxiliary bridge arm switching tube and the half-bridge main circuit switching tube;
the half-bridge main circuit is used for generating high-frequency positive and negative square waves and transmitting the high-frequency positive and negative square waves to the primary side of the transformer;
the main circuit output loop is used for generating output direct-current voltage with a required size;
and the resonant network output loop is used for realizing the transmission of the energy of the resonant network loop to the secondary side.
As a further improvement of the invention, the input power supply module comprises an input direct current power supply Ui and an input filter capacitor Cin, wherein the positive electrode of the input direct current power supply Ui is connected with one end of the input filter capacitor Cin, and the negative electrode of the input direct current power supply Ui is grounded after being connected with the other end of the input filter capacitor Cin.
As a further improvement of the invention, the auxiliary switch bridge arm circuit comprises a first auxiliary switch tube Sa and a second auxiliary switch tube Sb, wherein the drain electrode of the first auxiliary switch tube Sa is respectively connected with one end of the input filter capacitor Cin and the positive electrode of the input direct current power supply Ui, the source electrode of the first auxiliary switch tube Sa is connected with the drain electrode of the second auxiliary switch tube Sb, and the source electrode of the second auxiliary switch tube Sb is respectively connected with the other end of the input filter capacitor Cin and the negative electrode of the input direct current power supply Ui.
As a further improvement of the present invention, the resonant network includes a resonant inductor Lr and a resonant capacitor Cr, one end of the resonant inductor Lr is connected to the source of the first auxiliary switching tube Sa and the drain of the second auxiliary switching tube Sb, and the other end of the resonant inductor Lr is connected to one end of the resonant capacitor Cr. As a further improvement of the invention, the half-bridge main circuit comprises a first switching tube S1, a second switching tube S2, a first capacitor C1 and a second capacitor C2;
the drain electrode of the first switching tube S1 is respectively connected with the drain electrode of the first auxiliary switching tube Sa, one end of the input filter capacitor Cin, the anode of the input direct-current power supply Ui and one end of the first capacitor C1, the other end of the first capacitor C1 is connected with one end of the second capacitor C2, and the source stage of the first switching tube S1 is respectively connected with the drain electrode of the second switching tube S2 and the other end of the resonance capacitor Cr;
the source stage of the second switching tube S2 is connected to the source stage of the second auxiliary switching tube Sb, the other end of the input filter capacitor Cin, the negative electrode of the input dc power supply Ui, and the other end of the second capacitor C2.
As a further improvement of the invention, the main circuit output loop comprises a transformer excitation inductance Lm, a main circuit transformer T1, a first diode D1, a second diode D2, a first output filter inductance Lo1, a first output capacitance Co1 and a first output terminal Uo1;
one end of the transformer excitation inductor Lm is respectively connected with the source stage of the first switch tube S1, the other end of the resonance capacitor Cr and the drain electrode of the second switch tube S2, and the other end of the transformer excitation inductor Lm is respectively connected with the other end of the first capacitor C1 and one end of the second capacitor C2;
one end of a 1-time winding of the main circuit transformer T1 is connected with one end of a transformer excitation inductance Lm, and the other end of the 1-time winding of the main circuit transformer T1 is connected with the other end of the transformer excitation inductance Lm;
one end of the 2-time winding of the main circuit transformer T1 is connected with the anode of the first diode D1, and the other end of the 2-time winding of the main circuit transformer T1 is connected with the anode end of the second diode D2;
the cathode of the first diode D1 is respectively connected with the cathode of the second diode D2 and one end of the first output filter inductor Lo1, and the other end of the first output filter inductor Lo1 is respectively connected with one end of the first output capacitor Co1 and the anode of the first output end Uo1;
the other end of the first output capacitor Co1 is grounded and is respectively connected with the middle tap end of the 2-time winding of the main circuit transformer T1 and the cathode of the first output end Uo 1.
As a further improvement of the invention, the resonant network output loop comprises a resonant tank transformer T2, a third diode D3, a fourth diode D4, a second output filter inductance Lo2, a second output capacitor Co2 and a second output Uo2;
one end of the 1-time winding of the resonant circuit transformer T2 is connected with one end of the resonant inductor Lr, the source stage of the first auxiliary switching tube Sa and the drain electrode of the second auxiliary switching tube Sb respectively, and the other end of the 1-time winding of the resonant circuit transformer T2 is connected with one end of the resonant capacitor Cr;
one end of the 2-time winding of the resonant circuit transformer T2 is connected with the anode of the third diode D3, and the other end of the 2-time winding of the resonant circuit transformer T2 is connected with the anode of the fourth diode D4;
the cathode of the third diode D3 is connected with the cathode of the fourth diode D4 and one end of the second output filter inductor Lo2, the other end of the second output filter inductor Lo2 is connected with one end of the second output capacitor Co2 and the positive electrode of the second output end Uo2, and the other end of the second output capacitor Co2 is grounded and connected with the middle tap end of the 2-time winding of the resonant circuit transformer T2 and the negative electrode of the second output end Uo2.
As a further improvement of the present invention, the first auxiliary switching tube Sa, the second auxiliary switching tube Sb, the first switching tube S1 and the second switching tube S2 are all MOS tubes.
Compared with the prior art, the invention has the following beneficial effects:
the invention relates to a novel PWM control soft switching half-bridge DC-DC converter, which is characterized in that an auxiliary loop is added on the basis of the PWM control half-bridge DC-DC converter to control the connection and disconnection of a resonant network, the resonant network resonates to realize the soft switching of a switching tube of a main loop and the auxiliary loop, the high-frequency switching loss is reduced, and meanwhile, the resonant network is used as an independent output end, so that the working efficiency of a circuit is increased.
The novel PWM control soft switch half-bridge DC-DC converter can control the output voltage by changing the duty ratio of the main circuit, and a simpler control mode is reserved on the basis of providing soft switch conditions.
Drawings
FIG. 1 is a circuit topology diagram of a novel PWM controlled soft-switching half-bridge DC-DC converter of the present invention;
FIG. 2 is a timing diagram of the driving signal and switching tube voltage and current of a novel PWM controlled soft switching half-bridge DC-DC converter circuit according to the present invention;
FIG. 3 is a topology mode diagram of an operating mode 1 of a novel PWM controlled soft-switching half-bridge DC-DC converter circuit of the present invention;
FIG. 4 is a topology mode diagram of an operating mode 2 of a novel PWM controlled soft-switching half-bridge DC-DC converter circuit of the present invention;
FIG. 5 is a topology mode diagram of the operating mode 3 of a novel PWM controlled soft-switching half-bridge DC-DC converter circuit of the present invention;
FIG. 6 is a topology mode diagram of an operating mode 4 of a novel PWM controlled soft-switching half-bridge DC-DC converter circuit of the present invention;
FIG. 7 is a topology mode diagram of an operating mode 5 of a novel PWM controlled soft-switching half-bridge DC-DC converter circuit of the present invention;
FIG. 8 is a topology mode diagram of an operating mode 6 of a novel PWM controlled soft-switching half-bridge DC-DC converter circuit of the present invention;
FIG. 9 is a topology mode diagram of an operating mode 7 of a novel PWM controlled soft-switching half-bridge DC-DC converter circuit of the present invention;
FIG. 10 is a topology mode diagram of an operating mode 8 of a novel PWM controlled soft-switching half-bridge DC-DC converter circuit of the present invention;
FIG. 11 is a topology mode diagram of an operating mode 9 of a novel PWM controlled soft-switching half-bridge DC-DC converter circuit of the present invention;
FIG. 12 is a topology mode diagram of an operational mode 10 of a novel PWM controlled soft-switching half-bridge DC-DC converter circuit of the present invention;
in the accompanying drawings:
an input power module 1; inputting a direct current power supply Ui; inputting a filter capacitor Cin;
an auxiliary switching bridge arm circuit 2; a first auxiliary switching tube Sa; a second auxiliary switching tube Sb;
a resonant network 3; a resonant inductance Lr; a resonance capacitor Cr;
a half-bridge main circuit 4; a first switching tube S1; a second switching tube S2; a first capacitor C1; a second capacitor C2;
a main circuit output loop 5; excitation inductance Lm of the transformer; a main circuit transformer T1; a first diode D1, a second diode D2; a first output filter inductance Lo1; a first output capacitance Co1; a first output Uo1;
a resonant network output loop 6; a resonant tank transformer T2; a third diode D3; a fourth diode D4; a second output filter inductance Lo2; a second output capacitor Co2; and a second output Uo2.
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.
Fig. 1 shows a schematic structural diagram of an embodiment of a novel PWM-controlled soft-switching half-bridge DC-DC converter according to the present invention, where the main body includes an input power module 1, an auxiliary switching leg circuit 2, a resonant network 3, a half-bridge main circuit 4, a main circuit output loop 5, and a resonant network output loop 6.
The input power module 1 includes an input dc power Ui and an input filter capacitor Cin for implementing input of dc voltage and filtering of the input voltage. Specifically, the input power module 1 includes an input dc power Ui and an input filter capacitor Cin, where an anode of the input dc power Ui is connected to one end of the input filter capacitor Cin, and a cathode of the input dc power Ui is connected to the other end of the input filter capacitor Cin and then grounded.
The auxiliary switch bridge arm circuit 2 comprises a first auxiliary switch tube Sa and a second auxiliary switch tube Sb, and is used for controlling the connection and disconnection of the resonant network 3, specifically, the drain electrode of the first auxiliary switch tube Sa is respectively connected with one end of the input filter capacitor Cin and the positive electrode of the input direct current power supply Ui, the source stage of the first auxiliary switch tube Sa is connected with the drain electrode of the second auxiliary switch tube Sb, and the source stage of the second auxiliary switch tube Sb is respectively connected with the other end of the input filter capacitor Cin and the negative electrode of the input direct current power supply Ui. The first auxiliary switching tube Sa and the second auxiliary switching tube Sb are additionally arranged to control the connection and disconnection of the resonant network 3, and the resonant network 3 resonates to realize the soft switching of the main loop and the auxiliary loop switching tube.
The resonant network 3 includes a resonant inductance Lr and a resonant capacitance Cr, and is used for implementing soft switching of the auxiliary bridge arm switching tube and the main circuit switching tube. Specifically, one end of the resonant inductor Lr is connected to the source of the first auxiliary switching tube Sa and the drain of the second auxiliary switching tube Sb, and the other end of the resonant inductor Lr is connected to one end of the resonant capacitor Cr.
The half-bridge main circuit 4 is used for generating high-frequency positive and negative square waves and transmitting the high-frequency positive and negative square waves to the primary side of the transformer, the half-bridge main circuit 4 comprises a first switching tube S1, a second switching tube S2, a first capacitor C1 and a second capacitor C2, the high-frequency square waves are generated through alternate conduction of the first switching tube S1 and the second switching tube S2 and are transmitted to the primary side of the transformer, the direct-current waveforms are output after full-wave rectification, and the output voltage can be controlled through duty ratio adjustment. Specifically, the drain electrode of the first switching tube S1 is connected to the drain electrode of the first auxiliary switching tube Sa, one end of the input filter capacitor Cin, the positive electrode of the input dc power supply Ui, and one end of the first capacitor C1, the other end of the first capacitor C1 is connected to one end of the second capacitor C2, the source electrode of the first switching tube S1 is connected to the drain electrode of the second switching tube S2 and the other end of the resonance capacitor Cr, and the source electrode of the second switching tube S2 is connected to the source electrode of the second auxiliary switching tube Sb, the other end of the input filter capacitor Cin, the negative electrode of the input dc power supply Ui, and the other end of the second capacitor C2.
The main circuit output loop 5 comprises a transformer, a full-wave rectifying circuit and a filter network, and is used for generating an output direct-current voltage with a required size. Specifically, the main circuit output loop 5 includes a transformer excitation inductance Lm, a main circuit transformer T1, a first diode D1, a second diode D2, a first output filter inductance Lo1, a first output capacitor Co1, and a first output end Uo1, where the first diode D1 and the second diode D2 form a full-wave rectifying circuit, and the first output filter inductance Lo1 and the first output capacitor Co1 form a filter network. Specifically, one end of the transformer excitation inductance Lm is connected with the source of the first switching tube S1, the other end of the resonance capacitor Cr, and the drain of the second switching tube S2, the other end of the transformer excitation inductance Lm is connected with the other end of the first capacitor C1 and one end of the second capacitor C2, one end of the 1 st secondary winding of the main circuit transformer T1 is connected with one end of the transformer excitation inductance Lm, the other end of the 1 st secondary winding of the main circuit transformer T1 is connected with the other end of the transformer excitation inductance Lm, one end of the 2 nd secondary winding of the main circuit transformer T1 is connected with the anode of the first diode D1, the other end of the 2 nd secondary winding of the main circuit transformer T1 is connected with the anode of the second diode D2, the cathode of the first diode D1 is connected with the cathode of the second diode D2 and one end of the first output filter inductance Lo1, the other end of the first output filter inductance Lo1 is connected with one end of the first output capacitor Co1 and the positive electrode of the first output end Uo1, the other end of the first output capacitor Co1 is connected with the negative electrode of the main circuit transformer Co1 and the middle end of the output transformer Co1 is connected with the negative electrode of the first secondary winding of the first output transformer Co 1.
The resonant network output circuit 6 is configured to transfer energy of the resonant network circuit to the secondary side, and the resonant network output circuit 6 includes a resonant circuit transformer T2, a third diode D3, a fourth diode D4, a second output filter inductance Lo2, a second output capacitor Co2, and a second output terminal Uo2. In this embodiment, the resonant inductor Lr is a primary side inductor of the transformer, and energy of the loop of the resonant network 3 is transferred to the secondary side. Specifically, one end of the 1 st winding of the resonant tank transformer T2 is connected to one end of the resonant inductor Lr, the source of the first auxiliary switching tube Sa, and the drain of the second auxiliary switching tube Sb, the other end of the 1 st winding of the resonant tank transformer T2 is connected to one end of the resonant capacitor Cr, one end of the 2 nd winding of the resonant tank transformer T2 is connected to the anode of the third diode D3, the other end of the 2 nd winding of the resonant tank transformer T2 is connected to the anode of the fourth diode D4, the cathode of the third diode D3 is connected to the cathode of the fourth diode D4 and one end of the second output filter inductor Lo2, the other end of the second output filter inductor Lo2 is connected to one end of the second output capacitor Co2 and the anode of the second output end Uo2, and the other end of the second output capacitor Co2 is grounded, and is connected to the middle tap end of the 2 nd winding of the resonant tank transformer T2 and the cathode of the second output end Uo2, respectively.
Preferably, in the present embodiment, the first auxiliary switching tube Sa, the second auxiliary switching tube Sb, the first switching tube S1, and the second switching tube S2 are all MOS tubes. The gates of the first auxiliary switching tube Sa, the second auxiliary switching tube Sb, the first switching tube S1, and the second switching tube S2 receive switching signals provided by an external device.
The working principle and working mode of the PWM controlled soft-switching half-bridge DC-DC converter of the present invention will be described below with reference to fig. 2 to 12 by taking fig. 1 as a main circuit structure.
Working mode 1 (t 0 to t 1): the first auxiliary switch tube Sa, the second auxiliary switch tube Sb, the first switch tube S1 and the second switch tube S2 are all in an off state, at this time, the input direct-current power supply Ui only forms a loop with the input filter capacitor Cin, the first capacitor C1 and the second capacitor C2, the voltage on the transformer excitation inductance Lm is 0, the voltage on the first capacitor C1 and the second capacitor C2 is 1/2Ui, and the voltage on the first auxiliary switch tube Sa, the second auxiliary switch tube Sb, the first switch tube S1 and the second switch tube S2 is also 1/2Ui.
Working mode 2 (t 1 to t 2): the first auxiliary switching tube Sa is conducted, the resonant network 3 starts to resonate to generate forward current, the current im flowing through the transformer excitation inductance Lm also slowly rises, when the current im reaches the maximum value, the voltage at two ends of the transformer excitation inductance Lm rises from 0 to the maximum value of 1/2Ui, at the moment, the first auxiliary switching tube Sa, the resonant network 3 and the transformer excitation inductance Lm form a current loop, and meanwhile, resonant current flows through body diodes at two ends of the first switching tube S1 to clamp the voltage at two ends of the first switching tube S1 to 0, so that soft switching conditions are created for the first switching tube S1.
Working mode 3 (t 2 to t 3): the first switching tube S1 iS turned on with zero voltage, at this time, the current flowing through the series resonant inductor Lr and the resonant capacitor Cr iS reversed, the voltage VLr on the resonant inductor Lr iS reduced to 0, the current iS1 flowing through the first switching tube S1 iS increased, the resonant tank transformer T2 does not work in this working mode, at this time, the reverse current point of the resonant network 3 passes through the body diode of the first auxiliary switching tube Sa, and a zero voltage turn-off condition iS created for the first auxiliary switching tube Sa.
Working mode 4 (t 3 to t 4): the first auxiliary switching tube Sa is turned off, the current ir flowing through the resonant network 3 changes from a negative value to 0, and the current ir flowing through the body diode of the first auxiliary switching tube Sa is equal to the current ir, and thus also changes from a negative value to 0, and at this time, the current flowing through the first switching tube S1 gradually stabilizes.
Working mode 5 (t 4 to t 5): the first switching tube S1 is turned off, and the voltage at two ends of the first switching tube S1 is slowly increased due to the existence of the junction capacitor, the current flowing through the first switching tube S1 is slowly reduced to 0, and the resonant network 3 is excited to resonate, so that smaller forward voltage and forward current ir are generated. The exciting inductance current im slowly drops, cs2 is discharged while Cs1 is charged by the current, after Cs2 is discharged, the body diode of the second switching tube S2 is conducted, the current im is continuous, and the voltage at two ends of the second switching tube S2 is 0 in a short time.
Working mode 6 (t 4 to t 5): at this time, in dead time, the first auxiliary switching tube Sa, the second auxiliary switching tube Sb, the first switching tube S1 and the second switching tube S2 are all turned off, the main circuit has no current loop, and the voltages born by the first auxiliary switching tube Sa, the second auxiliary switching tube Sb, the first switching tube S1 and the second switching tube S2 and the first capacitor C1 and the second capacitor C2 are 1/2Ui.
Working mode 7 (t 5 to t 6): the second auxiliary switching tube Sb is turned on, the resonance inductor Lr and the resonance capacitor Cr start to resonate, negative voltage and negative current are generated on the resonance inductor Lr, current flows through a reverse diode of the second switching tube S2, the voltage at two ends of the second switching tube S2 is clamped to 0, soft switching conditions are created for the second switching tube S2, meanwhile, the current im flowing through the transformer excitation inductor Lm increases negatively, and the value of the voltage Vm on the transformer excitation inductor Lm rises to be-1/2 Ui.
Working mode 8 (t 6 to t 7): the second switching tube S2 is turned on, and the voltage at two ends of the second switching tube S2 is already reduced to 0 before the second switching tube S2 is turned on, so that the second switching tube S2 is turned on at zero voltage, the current flowing through the resonant network 3 is changed from negative to positive, the voltage Vr at two ends of the resonant inductor Lr is changed from negative to 0, the exciting inductance current im is increased negatively, the current flowing through the second switching tube S2 is increased to a stable value at the moment of isb= -ir, and the resonant circuit transformer T2 does not work in the working mode.
Working mode 9 (t 7 to t 8): the second auxiliary switching tube Sb is turned off, the current ir flowing through the resonant network 3 becomes 0, and the current flowing through the reverse diode of the second auxiliary switching tube Sb also decreases to 0, and at this time, the current flowing through the second auxiliary switching tube Sb gradually becomes stable.
Working mode 10 (t 8 to t 9): the second switching tube S2 is turned off, and the voltage at two ends of the second switching tube S2 is slowly increased due to the existence of the junction capacitor, the current flowing through the second switching tube S2 is slowly reduced to 0, and the resonant network 3 is excited to resonate, so that smaller negative voltage and negative current ir are generated. The exciting inductance current im slowly drops, cs1 is discharged while Cs2 is charged by the current, after Cs1 is discharged, the body diode of the first switching tube S1 is conducted, the voltage at two ends of the first switching tube S1 is 0 in a short time, and the next period is after t 9.
Through analysis of different working modes of the circuit, the PWM control type soft switch half-bridge DC-DC converter disclosed by the invention has the advantages that the switching-in and switching-out of a resonant network are controlled through the newly added auxiliary switch bridge arm circuit, soft switching conditions are created for a switching tube, and meanwhile, the energy of the resonant network is transmitted to an output end by using the resonant circuit transformer, so that the circuit has the following advantages: 1. PWM control is adopted, and the control mode is simpler; 2. the resonant network provides energy for the secondary side, so that the energy transmission efficiency of the circuit is improved; 3. soft switching of the switching tube is realized, and device loss is reduced; 4. the active devices are few, and the circuit topology is simple.
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. A novel PWM controlled soft switching half-bridge DC-DC converter, comprising: the device comprises an input power supply module (1), an auxiliary switch bridge arm circuit (2), a resonant network (3), a half-bridge main circuit (4), a main circuit output loop (5) and a resonant network output loop (6);
the input power supply module (1) is used for realizing the input of direct-current voltage and the filtering of the input voltage;
the auxiliary switch bridge arm circuit (2) is used for controlling the connection and disconnection of the resonant network (3);
the resonance network (3) is positioned between the auxiliary switch bridge arm circuit (2) and the half-bridge main circuit (4), one end of the resonance network (3) is connected with the bridge arm midpoint of the auxiliary switch bridge arm circuit (2), zero voltage turn-off of a switch tube in the auxiliary switch bridge arm circuit (2) is realized by utilizing circuit resonance, soft switching of the switch tube is realized, the other end of the resonance network (3) is connected with the bridge arm midpoint of the half-bridge main circuit (4), the current direction of the switch tube in the switch bridge arm of the half-bridge main circuit (4) and the on-off state of a diode of the switch tube body are changed when the resonance network (3) circuit resonates, so that zero voltage turn-on of the switch tube in the switch bridge arm of the half-bridge main circuit (4) is realized through the cooperation of a switch time sequence;
the output end of the half-bridge main circuit (4) is connected with the input end of the main circuit output loop (5) and is used for generating high-frequency positive and negative square waves to be transmitted to the primary side of the transformer;
the main circuit output loop (5) is used for transforming the high-frequency positive and negative square waves output by the half-bridge main circuit (4) through a transformer to generate output direct-current voltage with a required size;
the resonant network output loop (6) comprises a secondary side coupled with the resonant network (3) for effecting transfer of energy of the resonant network (3) loop to the secondary side.
2. The novel PWM controlled soft-switching half-bridge DC-DC converter according to claim 1, wherein: the input power supply module (1) comprises an input direct current power supply Ui and an input filter capacitor Cin, wherein the positive electrode of the input direct current power supply Ui is connected with one end of the input filter capacitor Cin, and the negative electrode of the input direct current power supply Ui is grounded after being connected with the other end of the input filter capacitor Cin.
3. The novel PWM controlled soft-switching half-bridge DC-DC converter according to claim 2, wherein: the auxiliary switch bridge arm circuit (2) comprises a first auxiliary switch tube Sa and a second auxiliary switch tube Sb, wherein the drain electrode of the first auxiliary switch tube Sa is respectively connected with one end of an input filter capacitor Cin and the anode of an input direct-current power supply Ui, the source stage of the first auxiliary switch tube Sa is connected with the drain electrode of the second auxiliary switch tube Sb, and the source stage of the second auxiliary switch tube Sb is respectively connected with the other end of the input filter capacitor Cin and the cathode of the input direct-current power supply Ui.
4. A novel PWM controlled soft switching half-bridge DC-DC converter according to claim 3, wherein: the resonant network (3) comprises a resonant inductor Lr and a resonant capacitor Cr, one end of the resonant inductor Lr is respectively connected with the source stage of the first auxiliary switching tube Sa and the drain electrode of the second auxiliary switching tube Sb, and the other end of the resonant inductor Lr is connected with one end of the resonant capacitor Cr.
5. The novel PWM controlled soft-switching half-bridge DC-DC converter set forth in claim 4, wherein: the half-bridge main circuit (4) comprises a first switching tube S1, a second switching tube S2, a first capacitor C1 and a second capacitor C2;
the drain electrode of the first switching tube S1 is respectively connected with the drain electrode of the first auxiliary switching tube Sa, one end of the input filter capacitor Cin, the anode of the input direct-current power supply Ui and one end of the first capacitor C1, the other end of the first capacitor C1 is connected with one end of the second capacitor C2, and the source stage of the first switching tube S1 is respectively connected with the drain electrode of the second switching tube S2 and the other end of the resonance capacitor Cr;
the source stage of the second switching tube S2 is connected to the source stage of the second auxiliary switching tube Sb, the other end of the input filter capacitor Cin, the negative electrode of the input dc power supply Ui, and the other end of the second capacitor C2.
6. The novel PWM controlled soft-switching half-bridge DC-DC converter according to claim 5, wherein: the main circuit output loop (5) comprises a transformer excitation inductance Lm, a main circuit transformer T1, a first diode D1, a second diode D2, a first output filter inductance Lo1, a first output capacitor Co1 and a first output end Uo1;
one end of the transformer excitation inductor Lm is respectively connected with the source stage of the first switch tube S1, the other end of the resonance capacitor Cr and the drain electrode of the second switch tube S2, and the other end of the transformer excitation inductor Lm is respectively connected with the other end of the first capacitor C1 and one end of the second capacitor C2;
one end of a 1-time winding of the main circuit transformer T1 is connected with one end of a transformer excitation inductance Lm, and the other end of the 1-time winding of the main circuit transformer T1 is connected with the other end of the transformer excitation inductance Lm;
one end of the 2-time winding of the main circuit transformer T1 is connected with the anode of the first diode D1, and the other end of the 2-time winding of the main circuit transformer T1 is connected with the anode end of the second diode D2;
the cathode of the first diode D1 is respectively connected with the cathode of the second diode D2 and one end of the first output filter inductor Lo1, and the other end of the first output filter inductor Lo1 is respectively connected with one end of the first output capacitor Co1 and the anode of the first output end Uo1;
the other end of the first output capacitor Co1 is grounded and is respectively connected with the middle tap end of the 2-time winding of the main circuit transformer T1 and the cathode of the first output end Uo 1.
7. The novel PWM controlled soft-switching half-bridge DC-DC converter of claim 6, wherein: the resonant network output loop (6) comprises a resonant loop transformer T2, a third diode D3, a fourth diode D4, a second output filter inductor Lo2, a second output capacitor Co2 and a second output end Uo2;
one end of the 1-time winding of the resonant circuit transformer T2 is connected with one end of the resonant inductor Lr, the source stage of the first auxiliary switching tube Sa and the drain electrode of the second auxiliary switching tube Sb respectively, and the other end of the 1-time winding of the resonant circuit transformer T2 is connected with one end of the resonant capacitor Cr;
one end of the 2-time winding of the resonant circuit transformer T2 is connected with the anode of the third diode D3, and the other end of the 2-time winding of the resonant circuit transformer T2 is connected with the anode of the fourth diode D4;
the cathode of the third diode D3 is connected with the cathode of the fourth diode D4 and one end of the second output filter inductor Lo2, the other end of the second output filter inductor Lo2 is connected with one end of the second output capacitor Co2 and the positive electrode of the second output end Uo2, and the other end of the second output capacitor Co2 is grounded and connected with the middle tap end of the 2-time winding of the resonant circuit transformer T2 and the negative electrode of the second output end Uo2.
8. The novel PWM controlled soft-switching half-bridge DC-DC converter according to claim 5, wherein: the first auxiliary switching tube Sa, the second auxiliary switching tube Sb, the first switching tube S1 and the second switching tube S2 are MOS tubes.
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