Multi-port full-range soft switching converter and control method thereof

Abstract

The invention provides a multi-port full-range soft switching converter and a control method thereof. The multi-port full-range soft switching converter comprises a multi-winding transformer, a primary side input circuit and a plurality of groups of secondary side output circuits, the multi-winding transformer comprises a primary winding which is used for being connected with the output end of a primary input circuit. The multi-winding transformer comprises a plurality of secondary windings, and each secondary winding is correspondingly connected with a group of secondary output circuits; each group of secondary side output circuit comprises a leakage inductor, a clamping capacitor, an output port switch tube, a diode, a load capacitor and a load resistor; the diode is used for replacing a switch tube of the secondary side half bridge, so that the cost is reduced; decoupling control is carried out on the duty ratio and the phase shift ratio, control is simplified, independent control over a plurality of output ports can be achieved, the problem of cross adjustment rate in a multi-output-port occasion is avoided, all the switching tubes can be switched on at zero voltage, all the diodes can be switched off at zero current, and the control efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of converter design, and in particular to a multi-port full-range soft switching converter and a control method thereof. Background Art

[0002] Active clamp flyback, active clamp forward, dual active bridge (DAB) converters and their improved solutions, which belong to soft switching technology, have been widely used in power supplies, and multi-channel output isolated switching power supplies are increasingly tending to be miniaturized, lightweight, efficient and low-cost. In isolated converters, although flyback and forward converters have fewer switches and simple control, they only perform closed-loop feedback control on the main output circuit for multi-port occasions, and the auxiliary output circuit is open-loop control, which will cause the problem of cross-regulation rate. When the voltage of one channel needs to be adjusted due to load changes, the voltage of other output terminals will also fluctuate accordingly, which will not meet the system's requirements for power supply, affect system performance, and even cause the system to malfunction. The DAB converter can achieve multi-port independent control through phase shift control, avoiding the problem of cross-regulation rate, but it has a large number of switches, and at least two switches are added for each additional output, which is costly. Summary of the invention

[0003] The present invention provides a multi-port full-range soft-switching converter and a control method thereof, the purpose of which is to solve the problem of cross-regulation rate caused by the inability of each output end of a traditional converter to independently control the closed loop in multi-output situations, the problem of increased cost due to the large number of switching tubes, and the problem of low efficiency caused by hard switching of switching tubes and diodes.

[0004] In order to achieve the above object, the present invention provides a multi-port full-range soft switching converter, comprising: Multi-winding transformer, primary input circuit, multiple sets of secondary output circuits; The multi-winding transformer includes a primary winding, which is used to connect to the output end of the primary input circuit; The multi-winding transformer includes a plurality of secondary windings, each of which is connected to a set of secondary output circuits; Each set of secondary output circuits includes leakage inductance, clamping capacitor, output port switch tube, diode, load capacitor, and load resistor; The first end of the leakage inductance is connected to the first end of the secondary winding, the second end of the leakage inductance is respectively connected to the anode of the diode and the drain of the output end switch tube, the second end of the secondary winding is respectively connected to the first end of the clamping capacitor, the second end of the load capacitor, and the second end of the load resistor, the second end of the clamping capacitor is connected to the source of the output port switch tube, and the cathode of the diode is respectively connected to the first end of the load capacitor and the first end of the load resistor.

[0005] Further, the primary input circuit includes a power supply, a first switch tube, a second switch tube, and a first capacitor; The positive electrode of the power supply is respectively connected to the first end of the first capacitor and the first end of the primary winding, the second end of the first capacitor is connected to the drain of the second switch tube, the source of the second switch tube is respectively connected to the second end of the primary winding and the drain of the first switch tube, and the source of the first switch tube is connected to the negative electrode of the power supply.

[0006] Furthermore, the secondary winding of the multi-winding transformer is expanded according to the number of secondary output circuits, and the number of secondary output circuits is at least 2 groups, namely a first group of secondary output circuits and a second group of secondary output circuits.

[0007] The present invention also provides a control method for a multi-port full-range soft switching converter, which is applied to the multi-port full-range soft switching converter. The control method includes: Step 1, collecting the input voltage of the primary input circuit and the output voltages of all secondary output circuits to obtain an input voltage sampling value and multiple output voltage sampling values; Step 2, by setting the expected output voltage value of the multi-port full-range soft switching converter, calculating the difference between the expected output voltage value and each output voltage sampling value, obtaining multiple differences, and assigning a digital PI regulator and a limiter to each difference, inputting each difference into the digital PI regulator and the limiter for limiting processing, and obtaining the shift phase of the multi-port full-range soft switching converter; Step 3, according to the input voltage sampling value, the expected output voltage value, the turns ratio of the multi-winding transformer and the maximum voltage stress that the switch tube in the primary input circuit can withstand, the duty cycle of the input primary input circuit and the secondary output circuit is calculated to obtain the duty cycle of the primary input circuit and the secondary output circuit; Step 4, input the shift phase ratio and duty cycle into the drive signal generating unit, generate multiple drive signals by adjusting the shift phase ratio and duty cycle control drive signal generating unit, and input the multiple drive signals into the primary input circuit and each group of secondary output circuits respectively, so as to control the output power of the multi-port full-range soft switching converter.

[0008] Furthermore, the shift phase ratio of the multi-port full-range soft-switching converter includes multiple phase ratios, each set of secondary output circuits corresponds to a shift phase ratio, and the shift phase ratio value is .

[0009] More specifically, the duty cycle includes: The duty cycle of the first switch , its calculation expression is: ; The duty cycle of the second switch , its calculation expression is: Duty cycle of the output port switch , its calculation expression is: in, Indicates the input voltage sampling value, Indicates the maximum voltage stress that the switch tube in the primary input circuit can withstand. represents the voltage transfer ratio, , Indicates the output voltage value, It represents the turns ratio of the secondary winding to the primary winding. Indicates the input voltage value.

[0010] Further, the driving signal includes at least four channels; The first driving signal is complementary to the second driving signal, and the first driving signal is input to the gate of the first switch tube; The second driving signal is input to the gate of the second switch tube; The third driving signal and the fourth driving signal are respectively input to the gate of the output port switch tube in one group of secondary output circuits among the multiple groups of secondary output circuits.

[0011] Further, the output power of the multi-port full-range soft switching converter is controlled, including: When the input voltage sampling value remains unchanged, the duty cycle of all the switch tubes remains unchanged. When the output voltage sampling value of the first group of secondary output circuits decreases and the output voltage sampling value of the second group of secondary output circuits remains unchanged, the shift ratio between the output port switch tube in the first group of secondary output circuits and the second switch tube increases, so that the output power of the first group of secondary output circuits increases and the output power of the second group of secondary output circuits remains unchanged. When the output voltage sampling value of the first group of secondary output circuits increases and the output voltage sampling value of the second group of secondary output circuits remains unchanged, the shift ratio between the output port switch tube in the first group of secondary output circuits and the second switch tube decreases, so that the output power of the first group of secondary output circuits decreases and the output power of the second group of secondary output circuits remains unchanged.

[0012] Further, the output power of the multi-port full-range soft switching converter is controlled, including: When the input voltage sampling value remains unchanged, the duty cycle of all the switch tubes remains unchanged. When the output voltage sampling value of the second group of secondary output circuits decreases and the output voltage sampling value of the first group of secondary output circuits remains unchanged, the shift ratio between the output port switch tube in the second group of secondary output circuits and the second switch tube increases, so that the output power of the second group of secondary output circuits increases and the output power of the first group of secondary output circuits remains unchanged. When the output voltage sampling value of the second group of secondary output circuits increases and the output voltage sampling value of the first group of secondary output circuits remains unchanged, the shift ratio between the output port switch tube and the second switch tube in the second group of secondary output circuits decreases, so that the output power of the second group of secondary output circuits decreases and the output power of the first group of secondary output circuits remains unchanged.

[0013] The above scheme of the present invention has the following beneficial effects: The multi-port full-range soft-switching converter provided by the present invention comprises a multi-winding transformer, a primary input circuit, and multiple groups of secondary output circuits; the multi-winding transformer comprises a primary winding, and the primary winding is used to be connected to the output end of the primary input circuit; the multi-winding transformer comprises multiple secondary windings, and each secondary winding is correspondingly connected to a group of secondary output circuits; each group of secondary output circuits comprises a leakage inductance, a clamping capacitor, an output port switch tube, a diode, a load capacitor, and a load resistor; compared with the existing half-bridge DAB converter and control method, the present invention replaces a switch tube of the secondary half bridge with a diode, thereby avoiding the problem of high cost; by decoupling the duty cycle and the shift ratio, not only is the control simple, but also the independent control of multiple output ports is realized, thereby avoiding the problem of cross-regulation rate in the case of multiple output ports, and all switch tubes can be turned on at zero voltage, and all diodes can be turned off at zero current, thereby improving the control efficiency.

[0014] Other beneficial effects of the present invention will be described in detail in the subsequent specific implementation section. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a circuit structure diagram of an embodiment of the present invention; Figure 2 is a control flow chart of an embodiment of the present invention; Figure 3 is a control block diagram of an embodiment of the present invention; Figure 4 Schematic diagram of the principle of the embodiment of the present invention. DETAILED DESCRIPTION

[0016] In order to make the technical problems, technical solutions and advantages to be solved by the present invention clearer, the following will be described in detail with reference to the accompanying drawings and specific embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0017] In the description of the present invention, it should be noted that the terms “first”, “second” and “third” are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0018] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a locking connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0019] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0020] In view of the existing problems, the present invention provides a multi-port full-range soft switching converter and a control method thereof.

[0021] like Figure 1 As shown, an embodiment of the present invention provides a multi-port full-range soft switching converter, comprising: Multi-winding transformer, primary input circuit, multiple sets of secondary output circuits; The multi-winding transformer includes a primary winding, which is used to connect to the output end of the primary input circuit; The multi-winding transformer includes a plurality of secondary windings, each of which is connected to a set of secondary output circuits; Each secondary output circuit includes a leakage inductor , Clamping Capacitor , output port switch tube ,diode , load capacitance , load resistance ; Leakage Inductance The first end of the secondary winding is connected to the first end of the secondary winding, and the leakage inductance The second end of the diode Anode, output switch tube The drain of the secondary winding is connected to the clamp capacitor The first end of the load capacitor The second end of the load resistor The second end of the clamp capacitor is connected The second end of the output port switch tube The source connection of the diode The cathode and load capacitance The first end of the load resistor The first end of the connection.

[0022] Specifically, the primary input circuit includes the power supply , the first switch tube , the second switch tube , the first capacitor ; power supply The positive electrode of the primary winding is connected to the first end of the primary winding, and the second end of the primary winding is connected to the second switch tube. The source of the first switch tube The drain connection of the first capacitor The first end of the second switch tube The drain connection, power supply The negative electrode of the first switch tube The source of the first capacitor The second end of the connection.

[0023] like Figure 1 As shown, in the embodiment of the present invention, the primary winding of the multi-winding transformer is connected in parallel with an excitation inductor, the secondary winding is 2, and the turns ratio of the multi-winding transformer is .

[0024] Specifically, the secondary winding of the multi-winding transformer can be expanded according to the number of secondary output circuits. The number of secondary output circuits is at least 2 groups, namely, the first group of secondary output circuits and the second group of secondary output circuits. Then, the secondary winding of the multi-winding transformer is at least 2, such as Figure 1 As shown, where: The first set of secondary output circuits include leakage inductance , Clamping Capacitor , output port switch tube ,diode , load capacitance , load resistance ; Leakage Inductance The first end of the secondary winding is connected to the first end of the secondary winding, and the leakage inductance The second end of the diode Anode, output switch tube The drain of the secondary winding is connected to the clamp capacitor The first end of the load capacitor The second end of the load resistor The second end of the clamp capacitor is connected The second end of the output port switch tube The source connection of the diode The cathode and load capacitance The first end of the load resistor A first end is connected; The second set of secondary output circuits include leakage inductance , Clamping Capacitor , output port switch tube ,diode , load capacitance , load resistance ; Leakage Inductance The first end of the secondary winding is connected to the first end of the secondary winding, and the leakage inductance The second end of the diode Anode, output switch tube The drain of the secondary winding is connected to the clamp capacitor The first end of the load capacitor The second end of the load resistor The second end of the clamp capacitor is connected The second end of the output port switch tube The source connection of the diode The cathode and load capacitance The first end of the load resistor The first end of the connection.

[0025] like Figure 2 and Figure 3 As shown, the present invention also provides a control method for a multi-port full-range soft switching converter, which is applied to a multi-port full-range soft switching converter. The control method includes: Step 1: Collect the input voltage of the primary input circuit and the output voltage of all secondary output circuits to obtain the input voltage sampling value. and multiple output voltage sampling values ; Step 2: By setting the expected output voltage of the multi-port full-range soft-switching converter , calculate the expected output voltage Each output voltage sampling value The difference of , and for each difference Assign a digital PI regulator (corresponding to Figure 3 Each difference is input into the digital PI regulator and the limiter for limiting processing, and the shift ratio of the multi-port full-range soft switching converter is obtained. ; Step 3: According to the input voltage sampling value , Output voltage expected value , the turns ratio of the multi-winding transformer and the maximum voltage stress that the switch tube in the primary input circuit can withstand , calculate the duty cycle of the input primary input circuit and the secondary output circuit, and get the duty cycle of the primary input circuit and the secondary output circuit ; Step 4: Move the and duty cycle Input drive signal generating unit, by adjusting the shift ratio and duty cycle The control driving signal generating unit generates multiple driving signals, and inputs the multiple driving signals to the primary input circuit and each group of secondary output circuits respectively, so as to control the output power of the multi-port full-range soft switching converter.

[0026] Specifically, in the embodiment of the present invention, the plurality of output voltage sampling values ​​include the output voltage sampling values ​​of the first group of secondary output circuits. and the output voltage sampling value of the second group of secondary output circuits ; The plurality of output voltage expected values ​​include the output voltage expected value of the first group of secondary output circuits and the expected output voltage of the second set of secondary output circuits The plurality of difference values ​​include the difference between the output voltage sampled value of the first group of secondary output circuits and the output voltage expected value of the first group of secondary output circuits and the difference between the output voltage sampling value of the second group of secondary output circuits and the output voltage expected value of the second group of secondary output circuits .

[0027] Most preferably, the shift phase of the multi-port full-range soft switching converter is Each secondary output circuit has a corresponding shift phase. , where the output port switch tube in the first set of secondary output circuits With the second switch The shift ratio between , the output port switch tube in the second set of secondary output circuit With the second switch The shift ratio between , compared with , The value of , .

[0028] Specifically, the duty cycle include: The first switch Duty cycle , its calculation expression is: ; The second switch Duty cycle , its calculation expression is: Output port switch Duty cycle The output port switch tube of the first secondary output circuit is included Duty cycle and the output port switch tube in the second secondary output circuit Duty cycle , its calculation expression is:

[0029] in, Indicates the input voltage sampling value, Indicates the first switch The maximum voltage stress that can be tolerated, represents the voltage transfer ratio, , Indicates the output voltage value, Pick , , It represents the turns ratio of the secondary winding to the primary winding. Pick , , Indicates the input voltage value.

[0030] Most preferably, the driving signal includes at least four paths; The first driving signal is complementary to the second driving signal, and the first driving signal is input to the first switch tube. The gate of The second driving signal is input to the second switch tube The gate of The third driving signal and the fourth driving signal are respectively input to the gate of the output port switch tube in one group of secondary output circuits among the multiple groups of secondary output circuits.

[0031] In the embodiment of the present invention, the third driving signal is input to the output port switch tube of the first group of secondary output circuits. The fourth drive signal is input to the output port switch tube of the second group of secondary output circuits. of the gate.

[0032] It should be noted that one driving signal corresponds to only the gate of one switching tube.

[0033] Specifically, the output power of a multi-port full-range soft-switching converter is controlled, including: At the input voltage sampling value Under the condition of no change, the duty cycle of all switch tubes , , , When the output voltage sampling value of the first set of secondary output circuits is The output voltage sampling value of the second set of secondary output circuits decreases. When the output port switch tube in the first set of secondary output circuits is unchanged, With the second switch Compared with the shift increases, so that the output power of the first group of secondary output circuits increases, and the output power of the second group of secondary output circuits remains unchanged; When the output voltage sampling value of the first set of secondary output circuits Increase the output voltage sampling value of the second set of secondary output circuits When the output port switch tube in the first set of secondary output circuits is unchanged, With the second switch Compared with the shift The output power of the first group of secondary output circuits is reduced, so that the output power of the second group of secondary output circuits remains unchanged.

[0034] Further, the output power of the multi-port full-range soft switching converter is controlled, including: At the input voltage sampling value Under the condition of no change, the duty cycle of all switch tubes , , , When the output voltage sampling value of the second set of secondary output circuits is The output voltage sampling value of the first group of secondary output circuits decreases. When the output port switch tube in the second set of secondary output circuits is unchanged, With the second switch Compared with the shift increases, so that the output power of the second group of secondary output circuits increases, and the output power of the first group of secondary output circuits remains unchanged; When the output voltage sampling value of the second set of secondary output circuits Increase, the output voltage sampling value of the first group of secondary output circuit When the output port switch tube in the second set of secondary output circuits is unchanged, With the second switch Compared with the shift The output power of the second group of secondary output circuits is reduced, so that the output power of the first group of secondary output circuits is reduced, and the output power of the first group of secondary output circuits remains unchanged.

[0035] Specifically, if Figure 4 As shown, the working process of the active clamp forward converter under the control of the above control method is as follows: Before t0, the output port switch transistor in the first secondary output circuit and the output port switch tube in the second secondary output circuit Conductivity; At t0, the input current , the first switch Zero voltage conduction; During the time period from t0 to t1, the leakage current and Increase linearly in the positive direction; At t1, the output port switch tube in the second secondary output circuit Shut down; During the period from t1 to t2, the diode in the second secondary output circuit At this time, the diode The current is equal to the leakage current , current Continue to increase linearly in the positive direction; At t2, the output port switch tube in the first secondary output circuit Shut down; During the period from t2 to t3, the diode in the first secondary output circuit At this time, the diode The current is equal to the leakage current ; At t3, the first switch Shut down; During the time period from t3 to t4, the first switch The junction capacitance is charged, and the second switch tube The junction capacitance is discharged; At t4, the input current , the second switch tube Zero voltage switch-on; During the period from t4 to t5, the diode in the first secondary output circuit The current starts to decrease linearly and is equal to the leakage inductance current , the diode in the second secondary output circuit The current starts to decrease linearly and is equal to the leakage inductance current ; At t5, the diode in the second secondary output circuit Current drops to 0, the diode Zero current shutdown; During the period from t5 to t6, the output port switch tube in the second secondary output circuit The junction capacitance is discharged, and the output port switch tube in the second secondary output circuit is known. The anti-parallel diode is turned on, and the output port switch tube in the second secondary output circuit Achieve zero voltage switching; At t6, the output port switch tube in the second secondary output circuit Open; During the period from t6 to t7, the diode in the first secondary output circuit Current Starts to decrease linearly, equal to the leakage current ; The diode in the second secondary output circuit No conduction, leakage current To the clamp capacitor in the second secondary output circuit Charge; At t7, the diode in the first secondary output circuit Current drops to 0, the diode in the first secondary output circuit Zero current shutdown; During the period from t7 to t8, the output port switch transistor in the first secondary output circuit The junction capacitance is discharged until the output port switch tube in the first secondary output circuit is The anti-parallel diode is turned on, and the output port switch tube in the first secondary output circuit Achieve zero voltage switching; At t8, the output port switch tube in the first secondary output circuit Open; During the period from t8 to t9, the diode in the first secondary output circuit No conduction, leakage current To the clamp capacitor in the second secondary output circuit Charge; At t9, the second switch tube Shut down; t9 to t 10 Time period, the first switch The junction capacitance is discharged, and the second switch tube The junction capacitance is charged.

[0036] The multi-port full-range soft switching converter provided by the embodiment of the present invention includes a multi-winding transformer, a primary input circuit, and multiple groups of secondary output circuits; the multi-winding transformer includes a primary winding, which is used to be connected to the output end of the primary input circuit; the multi-winding transformer includes multiple secondary windings, and each secondary winding is correspondingly connected to a group of secondary output circuits; each group of secondary output circuits includes leakage inductance, clamping capacitors, output port switches, diodes, load capacitors, and load resistors; compared with the existing half-bridge DAB converter and control method, the present invention replaces a switch tube of the secondary half bridge with a diode, thereby avoiding the problem of high cost; by decoupling the duty cycle and the shift ratio, not only is the control simple, but also the independent control of multiple output ports is realized, avoiding the problem of cross-regulation rate in the case of multiple output ports, and all switches can be turned on at zero voltage, and all diodes can be turned off at zero current, thereby improving the control efficiency.

[0037] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A multi-port full-range soft switching converter, characterized in that: include: Multi-winding transformer, primary input circuit, multiple sets of secondary output circuits; The multi-winding transformer comprises a primary winding, and the primary winding is used to be connected to the output end of the primary input circuit; The multi-winding transformer comprises a plurality of secondary windings, each of which is connected to a set of secondary output circuits; Each group of the secondary side output circuits includes a leakage inductor, a clamping capacitor, an output port switch tube, a diode, a load capacitor, and a load resistor; The first end of the leakage inductor is connected to the first end of the secondary winding, the second end of the leakage inductor is respectively connected to the anode of the diode and the drain of the output-end switch tube, the second end of the secondary winding is respectively connected to the first end of the clamping capacitor, the second end of the load capacitor, and the second end of the load resistor, the second end of the clamping capacitor is connected to the source of the output port switch tube, and the cathode of the diode is respectively connected to the first end of the load capacitor and the first end of the load resistor.

2. The multi-port full-range soft switching converter according to claim 1, characterized in that: The primary input circuit includes a power supply, a first switch tube, a second switch tube, and a first capacitor; The positive electrode of the power supply is connected to the first end of the primary winding, the second end of the primary winding is connected to the source of the second switch tube and the drain of the first switch tube, the first end of the first capacitor is connected to the drain of the second switch tube, and the negative electrode of the power supply is respectively connected to the source of the first switch tube and the second end of the first capacitor.

3. The multi-port full-range soft switching converter according to claim 2, characterized in that: The secondary winding of the multi-winding transformer is expanded according to the number of the secondary output circuits, and the number of the secondary output circuits is at least 2 groups, namely a first group of secondary output circuits and a second group of secondary output circuits.

4. A control method for a multi-port full-range soft switching converter, characterized in that: Applied to the multi-port full-range soft switching converter according to any one of claims 1 to 3, the control method comprises: Step 1, collecting the input voltage of the primary input circuit and the output voltages of all secondary output circuits to obtain an input voltage sampling value and multiple output voltage sampling values; Step 2, by setting the output voltage expected value of the multi-port full-range soft switching converter, calculating the difference between the output voltage expected value and each of the output voltage sampling values, obtaining multiple differences, and assigning a digital PI regulator and a limiter to each difference, inputting each difference into the digital PI regulator and the limiter for limiting processing, and obtaining the shift phase of the multi-port full-range soft switching converter; Step 3, calculating the duty cycle of the primary input circuit and the secondary output circuit according to the input voltage sampling value, the output voltage expected value, the turns ratio of the multi-winding transformer, and the maximum voltage stress that the switch tube in the primary input circuit can withstand, to obtain the duty cycle of the primary input circuit and the secondary output circuit; Step 4, inputting the shift phase ratio and the duty cycle into a driving signal generating unit, controlling the driving signal generating unit to generate multiple driving signals by adjusting the shift phase ratio and the duty cycle, and inputting the multiple driving signals into the primary input circuit and each group of the secondary output circuits respectively, so as to control the output power of the multi-port full-range soft switching converter.

5. The control method of a multi-port full-range soft switching converter according to claim 4, characterized in that: The multi-port full-range soft-switching converter comprises a plurality of phase shift ratios, each group of secondary output circuits corresponds to a phase shift ratio, and the phase shift ratio is set to .

6. The control method of a multi-port full-range soft switching converter according to claim 4, characterized in that: The duty cycle includes: The duty cycle of the first switch , its calculation expression is: ； The duty cycle of the second switch , its calculation expression is: Duty cycle of the output port switch , its calculation expression is: in, Indicates the input voltage sampling value, Indicates the maximum voltage stress that the switch tube in the primary input circuit can withstand. represents the voltage transfer ratio, , Indicates the output voltage value, It represents the turns ratio of the secondary winding to the primary winding. Indicates the input voltage value.

7. The control method of a multi-port full-range soft switching converter according to claim 4, characterized in that: The driving signal includes at least four channels; The first driving signal is complementary to the second driving signal, and the first driving signal is input to the gate of the first switch tube; The second driving signal is input to the gate of the second switch tube; The third driving signal and the fourth driving signal are respectively input to the gate of the output port switch tube in one group of secondary output circuits among the multiple groups of secondary output circuits.

8. The control method of a multi-port full-range soft switching converter according to claim 7, characterized in that: Controlling the output power of the multi-port full-range soft switching converter includes: When the input voltage sampling value remains unchanged, the duty cycle of all switch tubes remains unchanged. When the output voltage sampling value of the first group of secondary output circuits decreases and the output voltage sampling value of the second group of secondary output circuits remains unchanged, the shift ratio between the output port switch tube in the first group of secondary output circuits and the second switch tube increases, so that the output power of the first group of secondary output circuits increases and the output power of the second group of secondary output circuits remains unchanged. When the output voltage sampling value of the first group of secondary output circuits increases and the output voltage sampling value of the second group of secondary output circuits remains unchanged, the shift ratio between the output port switch tube in the first group of secondary output circuits and the second switch tube decreases, so that the output power of the first group of secondary output circuits decreases and the output power of the second group of secondary output circuits remains unchanged.

9. The control method of a multi-port full-range soft switching converter according to claim 7, characterized in that: Controlling the output power of the multi-port full-range soft switching converter includes: When the input voltage sampling value remains unchanged, the duty cycle of all switch tubes remains unchanged. When the output voltage sampling value of the second group of secondary output circuits decreases and the output voltage sampling value of the first group of secondary output circuits remains unchanged, the shift ratio between the output port switch tube in the second group of secondary output circuits and the second switch tube increases, so that the output power of the second group of secondary output circuits increases and the output power of the first group of secondary output circuits remains unchanged. When the output voltage sampling value of the second group of secondary output circuits increases and the output voltage sampling value of the first group of secondary output circuits remains unchanged, the shift ratio between the output port switch tube in the second group of secondary output circuits and the second switch tube decreases, so that the output power of the second group of secondary output circuits decreases and the output power of the first group of secondary output circuits remains unchanged.

Images