CN101834518A - Mode switching control method and switching control circuit of full-bridge converter - Google Patents
Mode switching control method and switching control circuit of full-bridge converter Download PDFInfo
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Abstract
The invention discloses a mode switching control method of a full-bridge converter. The method comprises the following steps of: a, acquiring a signal which reflects the load weight of the full-bridge converter; b, analyzing whether the signal belongs to the pre-defined signal which reflects heavy load; if the signal belongs to the pre-defined signal, entering the step c; and if the signal does not belong to the pre-defined signal, entering the step d; c, controlling the full-bridge converter to work under a phase shifting mode; and d, controlling the full-bridge converter to work under a limited bipolar mode. The invention also discloses a mode switching control circuit of the full-bridge converter. Due to the adoption of the mode switching control method and the mode switching control circuit of the full-bridge converter, a control mode is adjusted according to the load weight condition and the switching efficiency of the full-bridge converter can be effectively improved.
Description
Technical field
The present invention relates to the DC converting technology, particularly relate to a kind of phase shift and finite both mode switch control method and control switching circuit of full-bridge converter.
Background technology
Along with the development of power electronic technology, be that the Switching Power Supply of core is used more and more widely with the DC converter, simultaneously, require more and more higher to the efficient of converter.As a kind of DC converter topology, the phase-shifting full-bridge topology can realize the zero voltage switch of switching tube, greatly reduces switching loss, can satisfy user demand preferably.
Shown in Fig. 1～4 several phase whole-bridging circuit schematic diagrams that can realize zero voltage switch.
Wherein, diode D1～D4 is respectively endophyte diode or the external diode of switching tube Q1～Q4, and capacitor C 1～C4 is respectively parasitic capacitance or the external capacitor of Q1～Q4.Lr is a resonant inductance, and it has comprised the leakage inductance of transformer.Lo is an output afterflow inductance.Discharge and recharge for the junction capacitance of switching tube by resonant inductance Lr and afterflow inductance L o, thereby realize switching tube Q1～Q4 zero voltage switch.
In existing practical application, the driving of switching tube is generally provided by special chip, as UCC2875, UCC2895 etc.Be the inside theory diagram of UCC2895 and the sequential chart of output (these contents are incorporated the present invention into) thereof shown in Fig. 5～6:
Wherein, phase shift output signal OUTA, OUTB, OUTC, OUTD be driving switch pipe Q1, Q2, Q3, Q4 respectively.Under the phase-shift control mode, switching tube Q1 and Q2 take turns conducting, each conducting 180 degree angle, and switching tube Q3 and Q4 also are like this.But switching tube Q1 and Q4 be conducting simultaneously not, if the conducting of switching tube Q4 elder generation, and conducting behind the switching tube Q1, both differ an angle, i.e. phase shifting angle, so, switching tube Q3 and Q4 just form leading arm, and switching tube Q1 and Q2 form lagging leg.By regulating the adjustable size joint output voltage of phase shifting angle.
When load current was big, four switching tubes of full-bridge circuit can be realized soft switch.But when load current less (＜50% nominal load current), the electric current in resonant inductance and the afterflow inductance is less, and its energy shortage is with the electric charge on the junction capacitance of taking the switching tube that will open away, therefore, when this switching tube is opened, just can't realize that no-voltage is open-minded, its switching loss strengthens.Along with further reducing of load current, switching loss further strengthens, especially the switching loss of lagging leg.Near zero load the time, the voltage on the switching tube is near Vin, and the energy on its junction capacitance is:
(wherein, C is the junction capacitance capacity of switching tube or the capacity of external capacitor or the equivalent capacity of both parallel connections).When switching tube is opened, in the whole consumption of the energy on the junction capacitance and this switching tube.And in traditional PWM pattern, the voltage of switching tube only is Vin/2.Therefore, when underloading, the switching loss of phase shift pattern is four times of PWM pattern.
In sum, present phase whole-bridging circuit can't realize thoroughly that when underloading the no-voltage of switching tube is open-minded, and during especially near zero load, switching loss sharply increases.The increase of switching loss is unfavorable for the heat radiation of switching tube on the one hand; On the other hand, be unfavorable for that converter obtains higher efficient in the loading range of broad.
Summary of the invention
Main purpose of the present invention is exactly at the deficiencies in the prior art, and a kind of mode switch control method and control switching circuit are provided, and can make full-bridge converter obtain more high efficiency.
For achieving the above object, the present invention is by the following technical solutions:
A kind of mode switch control method of full-bridge converter may further comprise the steps:
A. gather the signal of the load weight of the described full-bridge converter of reflection;
B. analyze described signal and whether belong to the heavy duty signal of the reflection of defining in advance, be then to enter step c, otherwise enter steps d;
C. controlling described full-bridge converter works under the phase shift pattern;
D. controlling described full-bridge converter works under the finite both pattern.
Preferably, among the step a, the signal of the load weight of the described full-bridge converter of described reflection is a load current signal; Among the step b, the load current that collects enters steps d during less than 50% nominal load current.
Step b comprises:
B1. described signal is carried out filtering, processing and amplifying;
B2. relatively amplified signal value and preset reference value are if described amplified signal value greater than described fiducial value then enter described step c, otherwise enters described steps d.
Among the step c, the described control under the described phase shift pattern comprises:
Make in the described full-bridge converter first switching tube on first brachium pontis and second switch pipe take turns the conducting half period, the 3rd switching tube on second brachium pontis and the 4th switching tube take turns the conducting half period, the conducting of the described second switch pipe of the conduction ratio correspondence of described the 3rd switching tube differs a phase shifting angle, and the conducting of described first switching tube of the conduction ratio correspondence of described the 4th switching tube also differs a phase shifting angle.
In the steps d, the described control under the described finite both pattern comprises:
Make in the described full-bridge converter first switching tube on first brachium pontis and second switch pipe take turns the conducting half period, the 3rd switching tube and the 4th switching tube on second brachium pontis are worked under the PWM pattern, and described the 3rd switching tube and corresponding described conducting a period of time second switch pipe while, described the 4th switching tube and corresponding described conducting a period of time first switching tube while.
A kind of mode switch control circuit of full-bridge converter comprises:
Acquisition Circuit is used to gather the signal of the load weight of the described full-bridge converter of reflection;
Analysis circuit is used to analyze described signal and whether belongs to the heavy duty signal of the reflection of defining in advance;
Commutation circuit, be used for described analysis circuit provide be as a result the time make described full-bridge converter switch to the work of phase shift pattern, and described analysis circuit provide not as a result the time make described full-bridge converter switch to the work of finite both pattern.
Preferably, described Acquisition Circuit is to gather load current signal, and described analysis circuit is whether to analyze load current greater than 50% nominal load current.
Described analysis circuit comprises:
Filter circuit is used for described signal is carried out Filtering Processing;
Amplifying circuit is used for described signal is carried out processing and amplifying;
Comparison circuit is used for amplified signal value and preset reference value are compared, when described amplified signal value greater than described fiducial value time output high level signal, otherwise output low level signal.
Described full-bridge converter comprises first brachium pontis and second brachium pontis, described first brachium pontis comprises first switching tube and second switch pipe, described second brachium pontis comprises the 3rd switching tube and the 4th switching tube, described first switching tube and described the 4th switching tube are corresponding on ON time, and described second switch pipe and described the 3rd switching tube are corresponding on ON time;
Described commutation circuit comprises first or logical circuit, second or logical circuit, the 3rd with logical circuit and the 4th and logical circuit, described first or the output of one of the logical circuit described comparison circuit of input termination, described first or another input termination first drive signal of logical circuit, described second or the output of one of the logical circuit described comparison circuit of input termination, described second or another input termination second drive signal of logical circuit, the described the 3rd with the output of one of logical circuit input termination described second or logical circuit, the described the 3rd with another input termination the 3rd drive signal of logical circuit, the described the 4th with the output of one of logical circuit input termination described first or logical circuit, the described the 4th with the moving signal of another input termination 4 wheel driven of logical circuit, described first drive signal and described second drive signal offer first switching tube on first brachium pontis and second switch pipe in the described full-bridge converter respectively, the described the 3rd with logic circuit output signal offer the 3rd switching tube on second brachium pontis in the described full-bridge converter, the described the 4th with logic circuit output signal offer the 4th switching tube on second brachium pontis in the described full-bridge converter.
The described the 3rd is first through processing and amplifying before sending to described the 3rd switching tube with logic circuit output signal, and the described the 4th is first through processing and amplifying before sending to described the 4th switching tube with logic circuit output signal.
Beneficial technical effects of the present invention is:
The present invention is according to the mode of operation of the corresponding switching full-bridge converter of load weight of full-bridge converter, when being judged as heavy duty, full-bridge converter is worked under the phase shift pattern, and when being judged as underload, full-bridge converter switched under the finite both pattern work, thereby when underload, can effectively reduce the switching loss of switching tube, make converter can in wideer loading range, obtain higher efficient.
Description of drawings
Fig. 1～4 are several phase whole-bridging circuit schematic diagrams that can realize zero voltage switch;
Fig. 5 is the inside theory diagram of chip for driving UCC2895 that is used for the switching tube of phase whole-bridging circuit;
Fig. 6 is the sequential chart of drive signal output that is used for the switching tube of phase whole-bridging circuit;
Fig. 7 is the flow chart of a phase shift of the present invention and an embodiment of finite both method for handover control;
Fig. 8 is the structure chart of a phase shift of the present invention and an embodiment of finite both control switching circuit.
Embodiment
In conjunction with the accompanying drawings the present invention is further described in detail by the following examples.
The present invention is switched the control model of adjusting full-bridge converter according to the load weight situation of full-bridge converter, when load is heavier is that load current is when big, make full-bridge converter work in conventional phase shift pattern, and when load gentlier be load current hour, make full-bridge circuit work in the finite both pattern.Under the less situation of load current, full-bridge converter can effectively reduce switching loss with the work of finite both pattern, thereby improves overall efficiency.
As shown in Figure 7, in one embodiment, a kind of mode switch control method of full-bridge converter may further comprise the steps:
A. gather the signal of the load weight of the described full-bridge converter of reflection;
B. analyze described signal and whether belong to the heavy duty signal of the reflection of defining in advance, be then to enter step c, otherwise enter steps d;
C. controlling described full-bridge converter works under the phase shift pattern;
D. controlling described full-bridge converter works under the finite both pattern.
In a preferred embodiment, among the step a, the signal of the load weight of the described full-bridge converter of described reflection is a load current signal; Among the step b, the load current that collects enters steps d during less than 50% nominal load current.
In a preferred embodiment, step b comprises:
B1. described signal is carried out filtering, processing and amplifying;
B2. relatively amplified signal value and preset reference value are if described amplified signal value greater than described fiducial value then enter step c, otherwise enters steps d.
Please refer to Fig. 1-4, the full-bridge converter of a plurality of embodiment comprises first brachium pontis and second brachium pontis, and described first brachium pontis comprises the first switching tube Q1 and second switch pipe Q2, and described second brachium pontis comprises the 3rd switching tube Q3 and the 4th switching tube Q4.As full-bridge circuit, described first switching tube Q1 and described the 4th switching tube Q4 are corresponding on ON time, and described second switch pipe Q2 and described the 3rd switching tube Q3 are corresponding on ON time.
Among the step c, the described control under the phase shift pattern comprises:
Make in the described full-bridge converter the first switching tube Q1 on first brachium pontis and second switch pipe Q2 take turns i.e. 180 degree of conducting half period, the 3rd switching tube Q3 on second brachium pontis and the 4th switching tube Q4 take turns the conducting half period, and the conducting of the conducting of described the 3rd switching tube Q3 and described second switch pipe Q2 differs a phase shifting angle, and the conducting of the conducting of described the 4th switching tube Q4 and the described first switching tube Q1 also differs a phase shifting angle.Be not conducting simultaneously of switching tube Q2 and Q3, switching tube Q1 and Q4 be conducting simultaneously not.If the conducting of switching tube Q4 elder generation and conducting behind the switching tube Q1, both differ a phase shifting angle, and then switching tube Q3 and Q4 just form leading arm, and switching tube Q1 and Q2 form lagging leg.By regulating the adjustable size joint output voltage of phase shifting angle.When load current was big, four switching tubes of full-bridge converter can be realized soft switch.At this moment, discharge and recharge for the junction capacitance of switching tube, thereby realize switching tube Q1～Q4 zero voltage switch by resonant inductance Lr and afterflow inductance L o.
In the steps d, the described control under the described finite both pattern comprises:
Make in the described full-bridge converter first switching tube on first brachium pontis and second switch pipe take turns the conducting half period, the 3rd switching tube and the 4th switching tube on second brachium pontis are worked under the PWM pattern, and described the 3rd switching tube and corresponding described conducting a period of time second switch pipe while, described the 4th switching tube and corresponding described conducting a period of time first switching tube while.
Please refer to Fig. 1-4, the finite both control mode is to allow two switching tubes of a brachium pontis such as switching tube Q1 and Q2 take turns the conducting half period, the switching tube of another brachium pontis such as switching tube Q3 and Q4 are PWM work, wherein but switching tube Q4 is in the just conducting of switching tube Q1 conduction period, but switching tube Q3 is in the just conducting of switching tube Q2 conduction period, switching tube Q4 and switching tube Q1 be the conducting Ton time simultaneously, and Q3 and Q2 be conducting Ton time while also.Because switching tube Q3 and Q4 work in the PWM pattern when load is light, it compares the switching loss that can reduce switching tube Q3 and Q4 with the phase shift pattern.
Please refer to Fig. 8, according to one embodiment of present invention, a kind of mode switch control circuit of full-bridge converter comprises Acquisition Circuit, analysis circuit and commutation circuit.Wherein, Acquisition Circuit is used to gather the signal of the load weight that reflects described full-bridge converter; Analysis circuit is used to analyze described signal and whether belongs to the heavy duty signal of the reflection of defining in advance; Commutation circuit be used for described analysis circuit provide be as a result the time make described full-bridge converter switch to the work of phase shift pattern, and described analysis circuit provide not as a result the time make described full-bridge converter switch to the work of finite both pattern.The signal of the reflected load weight of Acquisition Circuit collection can be the feedback signal of load current signal, circuit and input current signal etc.For gathering load current, whether analysis circuit can provide the result who is or denys greater than 50% nominal load current according to load current.
Described analysis circuit preferably includes filter circuit, amplifying circuit and comparison circuit.Wherein, filter circuit is used for described signal is carried out Filtering Processing; Amplifying circuit is used for described signal is carried out processing and amplifying; Comparison circuit is used for amplified signal value IO and preset reference value Ref are compared, when described amplified signal value greater than described fiducial value time output high level signal, otherwise output low level signal.The control model of full-bridge circuit is determined in the output of comparison circuit, if the output high level signal then makes full-bridge circuit work in the phase shift pattern; If the output low level signal then makes full-bridge circuit work in the finite both pattern.
Please refer to Fig. 9, described commutation circuit preferably includes first or logical circuit A, second or logical circuit B, the 3rd with logical circuit C and the 4th with logical circuit D, described first or the output of one of logical circuit A input termination comparison circuit, described first or another input termination first drive signal OUTA of logical circuit A, described second or the output of one of the logical circuit B described comparison circuit of input termination, described second or another input termination second drive signal OUTB of logical circuit B, the described the 3rd with the output of one of logical circuit C input termination described second or logical circuit B, the described the 3rd with another input termination the 3rd drive signal OUTC of logical circuit C, the described the 4th with the output of one of logical circuit D input termination described first or logical circuit A, the described the 4th with the moving signal OUTD of another input termination 4 wheel driven of logical circuit D.Wherein, described first drive signal OUTA and the described second drive signal OUTB offer first switching tube Q1 on first brachium pontis and second switch pipe Q2 in the described full-bridge converter respectively, the 3rd with logical circuit C output signal OUTC1 offer the 3rd switching tube Q3 on second brachium pontis in the described full-bridge converter, the described the 4th with logical circuit D output signal OUTD1 offer the 4th switching tube Q4 on second brachium pontis in the full-bridge converter.
More preferably, the described the 3rd is first through processing and amplifying before sending to the 3rd switching tube Q3 with logical circuit C output signal OUTC1, and the described the 4th is first through processing and amplifying before sending to described the 4th switching tube Q4 with logical circuit D output signal OUTD1.
Please refer to Fig. 9, the principle of switching by the commutation circuit implementation pattern is as follows:
Among phase shift output OUTA, the OUTB of full-bridge chip, OUTC, the OUTD, output OUTA, OUTB be (or after the amplification of overdriving) difference driving switch pipe Q1 and switching tube Q2 directly.And output OUTC, the OUTD of full-bridge chip do following processing respectively: output OUTA, OUTB respectively by first or logical circuit and second or logical circuit carry out exclusive disjunction with the output of circuit relatively, obtain first or logical circuit and second or output signal OUTA1, the OUTB1 of logical circuit; To export again OUTC and signal OUTB1 by the 3rd with logical circuit with after, the signal OUTC1 of generation is used for directly (or after the amplification of overdriving) driving switch pipe Q3; To export OUTD and signal OUTA1 by the 4th with logical circuit with after, the signal OUTD1 of generation is used for directly (or after the amplification of overdriving) driving switch pipe Q4.
Above content be in conjunction with concrete preferred implementation to further describing that the present invention did, can not assert that concrete enforcement of the present invention is confined to these explanations.For the general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, can also make some simple deduction or replace, all should be considered as belonging to protection scope of the present invention.
Claims (10)
1. the mode switch control method of a full-bridge converter is characterized in that, may further comprise the steps:
A. gather the signal of the load weight of the described full-bridge converter of reflection;
B. analyze described signal and whether belong to the heavy duty signal of the reflection of defining in advance, be then to enter step c, otherwise enter steps d;
C. controlling described full-bridge converter works under the phase shift pattern;
D. controlling described full-bridge converter works under the finite both pattern.
2. control method as claimed in claim 1 is characterized in that, among the step a, the signal of the load weight of the described full-bridge converter of described reflection is a load current signal; Among the step b, the load current that collects enters steps d during less than 50% nominal load current.
3. control method as claimed in claim 1 is characterized in that step b comprises:
B1. described signal is carried out filtering, processing and amplifying;
B2. relatively amplified signal value and preset reference value are if described amplified signal value greater than described fiducial value then enter step c, otherwise enters steps d.
4. control method as claimed in claim 1 is characterized in that, among the step c, the described control under the described phase shift pattern comprises:
Make in the described full-bridge converter first switching tube on first brachium pontis and second switch pipe take turns the conducting half period, the 3rd switching tube on second brachium pontis and the 4th switching tube take turns the conducting half period, the conducting of the described second switch pipe of the conduction ratio correspondence of described the 3rd switching tube differs a phase shifting angle, and the conducting of described first switching tube of the conduction ratio correspondence of described the 4th switching tube also differs a phase shifting angle.
5. as each described control method in the claim 1 to 4, it is characterized in that in the steps d, the described control under the described finite both pattern comprises:
Make in the described full-bridge converter first switching tube on first brachium pontis and second switch pipe take turns the conducting half period, the 3rd switching tube and the 4th switching tube on second brachium pontis are worked under the PWM pattern, and described the 3rd switching tube and corresponding described conducting a period of time second switch pipe while, described the 4th switching tube and corresponding described conducting a period of time first switching tube while.
6. the mode switch control circuit of a full-bridge converter is characterized in that, comprising:
Acquisition Circuit is used to gather the signal of the load weight of the described full-bridge converter of reflection;
Analysis circuit is used to analyze described signal and whether belongs to the heavy duty signal of the reflection of defining in advance;
Commutation circuit, be used for described analysis circuit provide be as a result the time make described full-bridge converter switch to the work of phase shift pattern, and described analysis circuit provide not as a result the time make described full-bridge converter switch to the work of finite both pattern.
7. control method as claimed in claim 6 is characterized in that, described Acquisition Circuit is to gather load current signal, and described analysis circuit is whether to analyze load current greater than 50% nominal load current.
8. mode switch control circuit as claimed in claim 6 is characterized in that, described analysis circuit comprises:
Filter circuit is used for described signal is carried out Filtering Processing;
Amplifying circuit is used for described signal is carried out processing and amplifying;
Comparison circuit is used for amplified signal value and preset reference value are compared, when described amplified signal value greater than described fiducial value time output high level signal, otherwise output low level signal.
9. mode switch control circuit as claimed in claim 8 is characterized in that,
Described full-bridge converter comprises first brachium pontis and second brachium pontis, described first brachium pontis comprises first switching tube and second switch pipe, described second brachium pontis comprises the 3rd switching tube and the 4th switching tube, described first switching tube and described the 4th switching tube are corresponding on ON time, and described second switch pipe and described the 3rd switching tube are corresponding on ON time;
Described commutation circuit comprises first or logical circuit, second or logical circuit, the 3rd with logical circuit and the 4th and logical circuit, described first or the output of one of the logical circuit described comparison circuit of input termination, described first or another input termination first drive signal of logical circuit, described second or the output of one of the logical circuit described comparison circuit of input termination, described second or another input termination second drive signal of logical circuit, the described the 3rd with the output of one of logical circuit input termination described second or logical circuit, the described the 3rd with another input termination the 3rd drive signal of logical circuit, the described the 4th with the output of one of logical circuit input termination described first or logical circuit, the described the 4th with the moving signal of another input termination 4 wheel driven of logical circuit, described first drive signal and described second drive signal offer first switching tube on first brachium pontis and second switch pipe in the described full-bridge converter respectively, the described the 3rd with logic circuit output signal offer the 3rd switching tube on second brachium pontis in the described full-bridge converter, the described the 4th with logic circuit output signal offer the 4th switching tube on second brachium pontis in the described full-bridge converter.
10. mode switch control circuit as claimed in claim 9, it is characterized in that, the described the 3rd is first through processing and amplifying before sending to described the 3rd switching tube with logic circuit output signal, and the described the 4th is first through processing and amplifying before sending to described the 4th switching tube with logic circuit output signal.
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| CN201010171716A CN101834518B (en) | 2010-05-13 | 2010-05-13 | Mode switching control method and switching control circuit of full-bridge converter |
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Cited By (7)
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| CN103066881A (en) * | 2013-01-12 | 2013-04-24 | 华南理工大学 | Switching circuit of phase shift and limited bipolar control manner and control method thereof |
| CN103078506A (en) * | 2013-01-12 | 2013-05-01 | 华南理工大学 | Switching circuit for switching power supply control modes and control method for switching circuit |
| CN103259394A (en) * | 2013-05-31 | 2013-08-21 | 东莞铭普光磁股份有限公司 | Adjunct circuit of frequency-conversion and phase-shifted full-bridge converter |
| CN103457477A (en) * | 2013-09-23 | 2013-12-18 | 武汉中原电子集团有限公司 | Control method of phase shift soft switching converter |
| CN108390570A (en) * | 2018-02-12 | 2018-08-10 | 南京舜唐科技有限公司 | The control method and circuit of dcdc converter |
| CN110932556A (en) * | 2019-11-20 | 2020-03-27 | 合肥科威尔电源系统股份有限公司 | Phase-shifted full-bridge circuit topology low-voltage output mechanism and low-voltage output method |
| CN112886801A (en) * | 2021-01-11 | 2021-06-01 | 合肥科威尔电源系统股份有限公司 | Method and system for improving voltage and current overshoot during switching of PWM mode and phase-shift mode |
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| GB2396441B (en) * | 2002-12-20 | 2005-11-30 | Motorola Inc | Circuit and method for supplying an electrical a.c. load |
| CN100421339C (en) * | 2005-09-29 | 2008-09-24 | 艾默生网络能源有限公司 | Control method and control circuit for switching phase-shift full-bridge and PWM full-bridge in converter |
| CN1897426A (en) * | 2006-06-21 | 2007-01-17 | 艾默生网络能源有限公司 | Control of phase whole-bridging circuit and its control circuit |
| CN101355308B (en) * | 2008-08-29 | 2010-07-21 | 浙江大学 | Magnetic-integrated zero-voltage zero-current soft switch full bridge circuit |
| CN101618472B (en) * | 2009-08-06 | 2012-07-04 | 唐山松下产业机器有限公司 | Soft switching inversion welding machine |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103066881A (en) * | 2013-01-12 | 2013-04-24 | 华南理工大学 | Switching circuit of phase shift and limited bipolar control manner and control method thereof |
| CN103078506A (en) * | 2013-01-12 | 2013-05-01 | 华南理工大学 | Switching circuit for switching power supply control modes and control method for switching circuit |
| CN103259394A (en) * | 2013-05-31 | 2013-08-21 | 东莞铭普光磁股份有限公司 | Adjunct circuit of frequency-conversion and phase-shifted full-bridge converter |
| CN103457477A (en) * | 2013-09-23 | 2013-12-18 | 武汉中原电子集团有限公司 | Control method of phase shift soft switching converter |
| CN108390570A (en) * | 2018-02-12 | 2018-08-10 | 南京舜唐科技有限公司 | The control method and circuit of dcdc converter |
| CN110932556A (en) * | 2019-11-20 | 2020-03-27 | 合肥科威尔电源系统股份有限公司 | Phase-shifted full-bridge circuit topology low-voltage output mechanism and low-voltage output method |
| CN112886801A (en) * | 2021-01-11 | 2021-06-01 | 合肥科威尔电源系统股份有限公司 | Method and system for improving voltage and current overshoot during switching of PWM mode and phase-shift mode |
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