CN113489339A - Hybrid modulation dual-output DC-DC converter and control method thereof - Google Patents

Hybrid modulation dual-output DC-DC converter and control method thereof Download PDF

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CN113489339A
CN113489339A CN202110864498.6A CN202110864498A CN113489339A CN 113489339 A CN113489339 A CN 113489339A CN 202110864498 A CN202110864498 A CN 202110864498A CN 113489339 A CN113489339 A CN 113489339A
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switching tube
output
driving signal
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source electrode
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张正
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Shenzhen Wanzheng Xinyuan Co ltd
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Shenzhen Wanzheng Xinyuan Co ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
    • 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
    • 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

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)

Abstract

A hybrid modulation dual-output DC-DC converter and a control method thereof. The converter comprising a flying capacitor C1Three-level bridge arm and flying capacitor C2The bridge comprises a half-bridge arm, a first output rectifying and filtering circuit, a blocking capacitor, a high-frequency isolation transformer and a second output rectifying and filtering circuit. The control method that can be used is: the duty ratio of a driving signal of the first switching tube is 0.5; the driving signal of the third switching tube is the same as that of the first switching tube; the driving signals of the second switching tube and the fourth switching tube are complementary with the driving signal of the first switching tube; the duty ratio of a driving signal of the sixth switching tube is also 0.5, the phase lag of the driving signal of the sixth switching tube is lagged behind the phase of the driving signal of the first switching tube, the lag angle is phi, and phi is more than or equal to 0 and less than or equal to 180 degrees; the driving signal of the fifth switching tube is complementary with the driving signal of the sixth switching tube. Hair brushObviously has double-output function, has less magnetic elements and is beneficial to improving the power density. The two paths of outputs are suitable for working in high voltage reduction ratio application occasions, the conversion efficiency is high, and the cross regulation rate is not existed.

Description

Hybrid modulation dual-output DC-DC converter and control method thereof
Technical Field
The invention relates to the technical field of power electronics, in particular to a hybrid modulation dual-output DC-DC converter and a control method thereof.
Background
With the development of electric vehicle technology, vehicle-mounted power technology, communication power supply, power electronic system and the like, the power supply requirements required by many novel electric devices are higher and higher, and sometimes two or even multiple low-voltage direct-current power supplies are required to be used for supplying power to an auxiliary system, a control system and the like. For example, in an electric vehicle, power is supplied to auxiliary systems and devices of the vehicle while charging a power battery. The simplest method is that two or more independent power supplies are adopted for supplying power to the electric equipment, but the cost and the volume of the system are increased, and the integration of the whole power supply system is not facilitated. Some power supply systems can realize two-way or multi-way output, but the outputs are not independent, so that not only the high-efficiency control of each output cannot be realized, but also the problem of cross adjustment rate exists among the outputs, namely, when the output of one main control path is regulated, the outputs of other paths are inevitably influenced.
There are also schemes that can implement independent control of two-way output, such as patent application CN 108365760A, which discloses a hybrid modulation isolation type two-way output DC-DC converter. The topology includes: an input power supply; two parallel half-bridge LLC resonant circuits, adopting frequency modulation mode LLC converter output voltage; and the phase-shifting full-bridge circuit is connected between two bridge arms of the parallel half-bridge LLC resonant circuit, adjusts the phase mode phase-shifting direct-current output voltage between the two bridge arms, and switches off two-way input for the full-wave rectification circuit structure on the secondary side. The technology uses two control means of frequency modulation and phase shift, can realize the independent control of two paths of outputs, and the two paths of outputs are electrically isolated, so that the problems of cross regulation rate and the like existing in the two paths of outputs are solved. However, this solution has the following disadvantages: because two resonant networks and two high-frequency transformers are used, the total number of the resonant networks and the two high-frequency transformers comprises four magnetic elements, and the excessive number of the magnetic elements usually causes the volume of the whole system to be large, which is not beneficial to improving the power density; secondly, when the converter works in an application of high voltage reduction ratio, such as a 48V to 1V system in a communication power supply, the problem of excessive turns of the transformer winding exists for two paths of output in the scheme, and the increase of the turns of the transformer not only can increase the loss of the transformer, but also can further increase the volume of the magnetic element; secondly, in such working occasions, the LLC resonant converter often works in an over-resonant state, which further reduces the efficiency of the output of the branch in which the resonant converter is located.
Disclosure of Invention
The invention aims to provide a hybrid modulation dual-output DC-DC converter and a control method thereof.
The technical scheme for realizing the purpose of the invention is as follows:
a mixed modulation double-output DC-DC converter comprises a first switch tube, a second switch tube, a third switch tube and a fourth switch tube which are sequentially connected in series, wherein the drain electrode of the first switch tube is connected to a power supply, and the source electrode of the fourth switch tube is grounded; the first flying capacitor is bridged on the source electrodes of the first switching tube and the third switching tube, and the second flying capacitor is bridged on the source electrodes of the second switching tube and the fourth switching tube; the drain electrode of the fifth switching tube is connected to the drain electrode of the third switching tube, the source electrode of the fifth switching tube is connected to the drain electrode of the sixth switching tube, and the source electrode of the sixth switching tube is connected to the source electrode of the fourth switching tube; the circuit also comprises a first output branch and a second output branch; the first output branch comprises a filter inductor and an output capacitor; one end of the filter inductor is connected to the source electrode of the third switching tube, and the other end of the filter inductor is connected to the first load; the output capacitor is connected to the first load in parallel; the second output branch comprises a blocking capacitor, a high-frequency isolation transformer and a rectifying and filtering circuit which are connected in sequence; the input end of the blocking capacitor is connected to the source electrode of the third switching tube, the output end of the blocking capacitor is connected to one end of the primary electrode of the high-frequency isolation transformer, and the other end of the primary electrode of the high-frequency isolation transformer is connected to the source electrode of the fifth switching tube.
The other hybrid modulation dual-output DC-DC converter comprises a first switching tube, a second switching tube, a third switching tube and a fourth switching tube which are sequentially connected in series, wherein the drain electrode of the first switching tube is connected to a power supply, and the source electrode of the fourth switching tube is grounded; the first flying capacitor is bridged on the source electrodes of the first switching tube and the third switching tube, and the second flying capacitor is bridged on the source electrodes of the second switching tube and the fourth switching tube; the drain electrode of the fifth switching tube is connected to the drain electrode of the first switching tube, the source electrode of the fifth switching tube is connected to the drain electrode of the sixth switching tube, and the source electrode of the sixth switching tube is connected to the source electrode of the second switching tube; the circuit also comprises a first output branch and a second output branch; the first output branch comprises a filter inductor and an output capacitor; one end of the filter inductor is connected to the source electrode of the third switching tube, and the other end of the filter inductor is connected to the first load; the output capacitor is connected to the first load in parallel; the second output branch comprises a blocking capacitor, a high-frequency isolation transformer and a rectifying and filtering circuit which are connected in sequence; the input end of the blocking capacitor is connected to the source electrode of the first switch tube, the output end of the blocking capacitor is connected to one end of the primary electrode of the high-frequency isolation transformer, and the other end of the primary electrode of the high-frequency isolation transformer is connected to the source electrode of the fifth switch tube.
The control method of the two converters comprises the following steps: applying a driving signal to all the switching tubes; the duty ratio of a driving signal of the first switching tube is 0.5; the driving signal of the third switching tube is the same as that of the first switching tube; the driving signals of the second switching tube and the fourth switching tube are complementary with the driving signal of the first switching tube; the duty ratio of a driving signal of the sixth switching tube is also 0.5, the phase lag of the driving signal of the sixth switching tube is lagged behind the phase of the driving signal of the first switching tube, the lag angle is phi, and phi is more than or equal to 0 and less than or equal to 180 degrees; the driving signal of the fifth switching tube is complementary with the driving signal of the sixth switching tube.
Compared with the prior art, the invention has the beneficial effects that:
1. the converter has a double-output function, has few magnetic elements and is beneficial to improving the power density.
2. The two flying capacitors have 0.5 time of input bias voltage, the first-path converter realizes 0.25 time of voltage reduction gain with 0.5 duty ratio, and the conversion efficiency of the first-path output is effectively improved.
3. For the second output, the amplitude of the square wave voltage input by the phase-shifted full-bridge circuit is reduced to be half of the input voltage, so that the voltage reduction function is half of the input voltage, and the voltage reduction circuit is more suitable for occasions with high voltage reduction ratio application. Meanwhile, compared with the traditional scheme, the number of turns of the transformer is halved, and the conversion efficiency and the power density of the second output are facilitated.
4. The problem of output cross regulation rate does not exist, and when the second path of output voltage is output, only the phase shift angle between the half-bridge arm and the three-level arm is controlled, so that the operation of the first path of circuit cannot be influenced.
Drawings
Fig. 1 is a first hybrid modulation dual-output DC-DC converter topology structure diagram.
Fig. 2 is a second hybrid modulation dual-output DC-DC converter topology structure diagram.
Fig. 3 is an embodiment of the control method, and a steady-state operation waveform diagram under the embodiment.
Fig. 4 is an equivalent circuit diagram of the first hybrid modulation dual-output DC-DC converter in the operating mode 1.
Fig. 5 is an equivalent circuit diagram of the first hybrid modulation dual-output DC-DC converter in the operating mode 2.
Fig. 6 is an equivalent circuit diagram of the first hybrid modulation dual-output DC-DC converter in the operating mode 3.
Fig. 7 is an equivalent circuit diagram of the first hybrid modulation dual-output DC-DC converter in the operating mode 4.
Main symbol names in the drawings: vIN: a power supply voltage is input. S1、S2、S2、S3、S4、S5、S6: and a switch tube. C1、C2: a flying capacitor. L is01: the first path outputs a filter inductor. C01: the first path outputs a filter capacitor. RL1: the first path outputs load. V01: the first path outputs voltage. CB: and a DC blocking capacitor. L isr: and (4) high-frequency isolation of the leakage inductance of the transformer. L ism: high frequency isolation transformer excitation inductance. TR: a high frequency isolation transformer. D1、D2: the second path outputs a rectifying diode. L is02: the second path outputs a filter inductor. C02: the second path outputs a filter capacitor. RL2: and the second path outputs a load. V02: the second path outputs voltage. VA: the A point is connected to the ground voltage. VAB: voltage between point a and point B. Vgs_S1、Vgs_S2、Vgs_S3、Vgs_S4、Vgs_S5、Vgs_S6: the switching tube drives the waveform. i.e. iLr: the leakage inductance current waveform of the transformer. i.e. iL01、iL02: and outputting a filtered inductor current waveform.I01: the first path of average output current. I is02: the second path average output current. D: switching tube duty cycle. T iss: and switching period of the switching tube. Phi: and the phase shift angle of the switching tube.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
As shown in figures 1 and 2, the two mixed modulation dual-output DC-DC converters comprise flying capacitors C1Three-level bridge arm and flying capacitor C2The bridge comprises a half-bridge arm, a first output rectifying and filtering circuit, a blocking capacitor, a high-frequency isolation transformer and a second output rectifying and filtering circuit. The converter has a double-path output function, has few magnetic elements and is beneficial to improving the power density.
Fig. 3 shows a specific embodiment of a control method that can be used by the hybrid modulation dual-output DC-DC converter. The duty ratio of a driving signal of the first switching tube is 0.5; the driving signal of the third switching tube is the same as that of the first switching tube; the driving signals of the second switching tube and the fourth switching tube are complementary with the driving signal of the first switching tube; the duty ratio of a driving signal of the sixth switching tube is also 0.5, the phase lag of the driving signal of the sixth switching tube is lagged behind the phase of the driving signal of the first switching tube, the lag angle is phi, and phi is more than or equal to 0 and less than or equal to 180 degrees; the driving signal of the fifth switching tube is complementary with the driving signal of the sixth switching tube. The first output works in an open loop mode, and the voltage gain is 0.25, that is, the first output voltage is 1/4 constant as the input voltage. When the lag angle phi is 0 DEG, the second output reaches the maximum value
Figure BDA0003186835610000031
When the hysteresis angle Φ is 180 °, the second output reaches a minimum value of 0.
In the embodiment, by utilizing the characteristic that the efficiency is higher when the duty ratio of the Buck converter is larger, the 0.25-time voltage reduction gain of the input voltage is realized by the bias voltage of the two flying capacitors and the duty ratio of 0.5, and the conversion efficiency of the first output is effectively improved; meanwhile, for the second output, the amplitude of the square wave voltage input by the phase-shifted full-bridge circuit is reduced to be half of the input voltage, so that the voltage reduction function is half of the input voltage, and the voltage reduction circuit is more suitable for occasions with high voltage reduction ratio. Meanwhile, compared with the traditional scheme, the number of turns of the transformer is halved, and the conversion efficiency of the second output path and the system power density are improved. In addition, the two paths do not have the problem of output cross regulation rate, and only the phase shift angle between the half-bridge arm and the three-level arm is controlled when the second path of output voltage is applied, so that the operation of the first path of circuit is not influenced.
Before performing a detailed modal analysis, the following assumptions are made:
1. two flying capacitor voltages C1And C1Is stabilized at 0.5VINThe voltage can be regarded as a constant value in one switching period;
2. the two output voltages can be regarded as constant values within one switching period without considering two output voltage ripples, and are respectively V01And V02；
3. The converter works in a steady state, and the two output filter inductance currents are in a continuous mode;
4. to simplify the analysis, the dead space between the tubes was not considered.
Therefore, the hybrid modulation isolation type dual-output DC-DC converter provided by the invention can be divided into 4 working modes in one switching period, and when the converter works in a steady state, the waveforms of all key voltages and currents are shown in figure 3.
The specific working principle is as follows:
(1) operating state 1, as shown in fig. 4: 0<t<t1And (5) stage. At time 0, S1And S3Is turned on and S5Is still in the conducting state, so the voltage V at the point AAIs 0.5VINThe voltage at point AB is 0. For the first path load: the inductor L is heavily output due to the application of the first load0The voltage at both ends is 0.5VIN-V01So that the inductor current is changed from the minimum value to (0.5V)IN-V0)/L0Is increased linearly, during this phase, the input passes through the flying capacitor C1And energy is transferred to the filter inductor and the output in the first path of load. For the second load: since the voltage applied between the two points AB is 0,output inductor L at this time02Inductance follow current forced secondary side diode D1And D2And simultaneously conducting to ensure that the voltage of a secondary winding of the transformer TR is zero, the voltage of a primary winding is correspondingly zero, and the leakage inductance L of the transformer TR isrAnd a blocking capacitor CBOperating in a resonant state. Output inductor L02The voltage at both ends is-V02So that the inductive current is set to V02/L02The slope of (a) decreases linearly.
(2) Operating state 2, as shown in fig. 5: t is t1<t<t2And (5) stage. At t1Time of day, S5Off and S6Is turned on and S1And S3Is still in the conducting state, so the voltage at the point A is still VAIs 0.5VINVoltage, but AB two-point voltage VABInto a capacitance C2Voltage across, also equal to 0.5VIN. For the first path load: output inductor L01The voltage at both ends is 0.5VIN-V01Therefore, the inductor current is still at (0.5V)IN-V01)/L01The slope of (a) increases linearly. For the second load: the voltage of the two points is changed into 0.5V by applying ABINSo that the leakage inductance LrCurrent line type of (D) is increased so that the secondary side diode D1Is conducted and applied to the output inductor L02The voltage across the terminals is ((0.5V)IN)/n-V02) Therefore, the inductive current is still ((0.5V)IN)/n-V02)/L02The slope of (a) increases linearly.
(3) Operating state 3, as shown in fig. 6: t is t2<t<t3And (5) stage. At t2Time of day, S1And S3Simultaneous turn-off, S2And S4Are simultaneously turned on, and S6Is still in the conducting state, so the voltage V at the point AAThe voltage becomes 0 and the voltage page at the two points AB is 0. For the first path load: the inductor L is heavily output due to the application of the first load01The voltage at both ends is-V01So that the inductor current is decreased from the minimum value to (-V)01)/L01The slope of the first path load is linearly reduced, and in the stage, the filter inductor L is arranged in the first path load01Through a switching tube S4Freewheeling simultaneously transfers energy to the output.For the second load: similar to mode 1, since the voltage applied between points AB and AB is 0, the output inductance L is now equal to02Inductance follow current forced secondary side diode D1And D2And simultaneously conducting to ensure that the voltage of a secondary winding of the transformer TR is zero, the voltage of a primary winding is correspondingly zero, and the leakage inductance L of the transformer TR isrAnd a blocking capacitor CBOperating in a resonant state. Output inductor L02The voltage at both ends is-V02So that the inductive current is set to V02/L02The slope of (a) decreases linearly.
(4) Operating state 4, as shown in fig. 7: t is t3<t<TsAnd (5) stage. At t3Time of day, S6Off and S5Is turned on and S2And S4Is still in the conducting state, so the voltage V at the point AAIs still 0 voltage, but two points AB and the capacitor C1And C2Are reversely connected in parallel, so the size is-0.5VIN. For the first path load: applying the first load heavy output inductance L01The voltage at both ends is-V01So that the inductor current is decreased from the minimum value to (-V)01)/L01The slope of the first path load is linearly reduced, and in the stage, the filter inductor L is arranged in the first path load01Through a switching tube S4Freewheeling simultaneously transfers energy to the output. For the second load: the voltage of the two points is changed into-0.5V by applying ABINSo that the leakage inductance LrThe current line of (D) is increased in a reverse line type, so that the secondary side diode D is increased2Is conducted and applied to the output inductor L02The voltage across the terminals is ((0.5V)IN)/n-V02) Therefore, the inductive current is still ((0.5V)IN)/n-V02)/L02The slope of (a) increases linearly.
In conclusion, the novel high-voltage-reduction-ratio hybrid modulation isolation type double-output DC-DC converter has a double-output function, has few magnetic elements and is beneficial to improving the power density. When the control method of the embodiment is adopted, all the switching tubes work in a driving mode with the duty ratio D of 0.5, the control mode is simple and easy to realize, and the two paths of output are electrically isolated. The larger the duty ratio of the Buck converter is, the higher the efficiency is, the 0.25-time voltage reduction gain of the input voltage is realized by the aid of the bias voltages of the two flying capacitors and the duty ratio of 0.5, and the conversion efficiency of the first output is effectively improved. For the second output, the amplitude of the square wave voltage input by the phase-shifted full-bridge circuit is reduced to be half of the input voltage, so that the voltage reduction function is half of the input voltage, and the voltage reduction circuit is more suitable for occasions with high voltage reduction ratio application. Meanwhile, compared with the traditional scheme, the number of turns of the transformer is halved, and the conversion efficiency and the power density of the second output are facilitated. The converter does not have the problem of output cross regulation rate, and only controls the phase shift angle between the half-bridge arm and the three-level arm when outputting the second path of output voltage, so that the operation of the first path of circuit cannot be influenced.

Claims (4)

1. A mixed modulation dual-output DC-DC converter is characterized by comprising a first switch tube, a second switch tube, a third switch tube and a fourth switch tube which are sequentially connected in series, wherein the drain electrode of the first switch tube is connected to a power supply, and the source electrode of the fourth switch tube is grounded; the first flying capacitor is bridged on the source electrodes of the first switching tube and the third switching tube, and the second flying capacitor is bridged on the source electrodes of the second switching tube and the fourth switching tube; the drain electrode of the fifth switching tube is connected to the drain electrode of the third switching tube, the source electrode of the fifth switching tube is connected to the drain electrode of the sixth switching tube, and the source electrode of the sixth switching tube is connected to the source electrode of the fourth switching tube; the circuit also comprises a first output branch and a second output branch; the first output branch comprises a filter inductor and an output capacitor; one end of the filter inductor is connected to the source electrode of the third switching tube, and the other end of the filter inductor is connected to the first load; the output capacitor is connected to the first load in parallel; the second output branch comprises a blocking capacitor, a high-frequency isolation transformer and a rectifying and filtering circuit which are connected in sequence; the input end of the blocking capacitor is connected to the source electrode of the third switching tube, the output end of the blocking capacitor is connected to one end of the primary electrode of the high-frequency isolation transformer, and the other end of the primary electrode of the high-frequency isolation transformer is connected to the source electrode of the fifth switching tube.
2. The control method of a hybrid modulation dual-output DC-DC converter according to claim 1, characterized in that the driving signals are applied to all the switching tubes; the duty ratio of a driving signal of the first switching tube is 0.5; the driving signal of the third switching tube is the same as that of the first switching tube; the driving signals of the second switching tube and the fourth switching tube are complementary with the driving signal of the first switching tube; the duty ratio of a driving signal of the sixth switching tube is also 0.5, the phase lag of the driving signal of the sixth switching tube is lagged behind the phase of the driving signal of the first switching tube, the lag angle is phi, and phi is more than or equal to 0 and less than or equal to 180 degrees; the driving signal of the fifth switching tube is complementary with the driving signal of the sixth switching tube.
3. A mixed modulation dual-output DC-DC converter is characterized by comprising a first switch tube, a second switch tube, a third switch tube and a fourth switch tube which are sequentially connected in series, wherein the drain electrode of the first switch tube is connected to a power supply, and the source electrode of the fourth switch tube is grounded; the first flying capacitor is bridged on the source electrodes of the first switching tube and the third switching tube, and the second flying capacitor is bridged on the source electrodes of the second switching tube and the fourth switching tube; the drain electrode of the fifth switching tube is connected to the drain electrode of the first switching tube, the source electrode of the fifth switching tube is connected to the drain electrode of the sixth switching tube, and the source electrode of the sixth switching tube is connected to the source electrode of the second switching tube; the circuit also comprises a first output branch and a second output branch; the first output branch comprises a filter inductor and an output capacitor; one end of the filter inductor is connected to the source electrode of the third switching tube, and the other end of the filter inductor is connected to the first load; the output capacitor is connected to the first load in parallel; the second output branch comprises a blocking capacitor, a high-frequency isolation transformer and a rectifying and filtering circuit which are connected in sequence; the input end of the blocking capacitor is connected to the source electrode of the first switch tube, the output end of the blocking capacitor is connected to one end of the primary electrode of the high-frequency isolation transformer, and the other end of the primary electrode of the high-frequency isolation transformer is connected to the source electrode of the fifth switch tube.
4. The control method of a hybrid modulation dual-output DC-DC converter according to claim 3, characterized in that the driving signals are applied to all the switching tubes; the duty ratio of a driving signal of the first switching tube is 0.5; the driving signal of the third switching tube is the same as that of the first switching tube; the driving signals of the second switching tube and the fourth switching tube are complementary with the driving signal of the first switching tube; the duty ratio of a driving signal of the sixth switching tube is also 0.5, the phase lag of the driving signal of the sixth switching tube is lagged behind the phase of the driving signal of the first switching tube, the lag angle is phi, and phi is more than or equal to 0 and less than or equal to 180 degrees; the driving signal of the fifth switching tube is complementary with the driving signal of the sixth switching tube.
CN202110864498.6A 2021-07-29 2021-07-29 Hybrid modulation dual-output DC-DC converter and control method thereof Pending CN113489339A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113938013A (en) * 2021-10-21 2022-01-14 江南大学 Bidirectional buck-boost direct current converter and working parameter configuration method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113938013A (en) * 2021-10-21 2022-01-14 江南大学 Bidirectional buck-boost direct current converter and working parameter configuration method
CN113938013B (en) * 2021-10-21 2023-08-01 江南大学 Bidirectional buck-boost direct current converter and working parameter configuration method

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