CN107147299A - A kind of DC DC circuit design methods of changeable phase shifting control and pulse-width controlled - Google Patents
A kind of DC DC circuit design methods of changeable phase shifting control and pulse-width controlled Download PDFInfo
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- CN107147299A CN107147299A CN201710433134.6A CN201710433134A CN107147299A CN 107147299 A CN107147299 A CN 107147299A CN 201710433134 A CN201710433134 A CN 201710433134A CN 107147299 A CN107147299 A CN 107147299A
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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
- H02M3/33576—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 having at least one active switching element at the secondary side of an isolation transformer
- H02M3/33592—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 having at least one active switching element at the secondary side of an isolation transformer having a synchronous rectifier circuit or a synchronous freewheeling circuit at the secondary side of an isolation transformer
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a kind of DC DC circuit design methods of changeable phase shifting control and pulse-width controlled, load is detected first, then judge the size of load, PWM control modes or phase-shift control mode are used to DC DC circuits according to different loads, following steps are specifically included：1) test is trained, is determined to carry out the switching threshold of phase-shifting full-bridge and PWM control mode switchings according to overall efficiency；2) load is detected；3) DSP can judge the size of load, it is determined that the control mode taken DC DC circuits；4) switching of PWM control modes and phase-shift control mode is carried out to DC DC circuits.The present invention effectively increases efficiency during the small load of server power supply, enhances the competitiveness of product.
Description
Technical field
The present invention relates to a kind of DC-DC circuit design method of changeable phase shifting control and pulse-width controlled, belong to general clothes
Business device power supply technique field.
Background technology
The energy problem in the whole world is increasingly severe at present, becomes increasingly to be paid attention in China's electrical problem.Server pair
Power-efficient specification requirement more and more higher, for power-efficient problem, Switching Power Supply topology DC-DC parts become from hard switching
Sofe Switch, the method that designer's raising power-efficient is developed now is mainly reflected in the lifting of device performance.
But, modification of the current engineer to electric source topology in itself is few, it is impossible under the conditions of meeting low-load
Requirement of the server to power-efficient.Therefore, in the urgent need to a kind of DC-DC circuit that can improve efficiency under the conditions of low-load is set
Meter method.
The content of the invention
In view of the shortcomings of the prior art, the invention provides the DC-DC of a kind of changeable phase shifting control and pulse-width controlled electricity
Road design method, it is possible to increase the efficiency under the conditions of low-load.
The present invention solves its technical problem and adopted the technical scheme that：A kind of changeable phase shifting control and pulse-width controlled
DC-DC circuit design method, it is characterized in that, load is detected first, the size of load is then judged, is born according to different
Carry and PWM control modes or phase-shift control mode are used to DC-DC circuit.
Further, described method comprises the following steps：
1) test is trained, is determined to carry out the switching threshold of phase-shifting full-bridge and PWM control mode switchings according to overall efficiency
Value；
2) load is detected；
3) DSP can judge the size of load, it is determined that the control mode taken DC-DC circuit；
4) switching of PWM control modes and phase-shift control mode is carried out to DC-DC circuit.
Further, it is described to determine that the control mode process taken DC-DC circuit is：If the load of detecting is small
PWM control modes are then used in switching threshold, if the load of detecting uses phase-shift control mode more than switching threshold.
Further, when carrying out the switching of PWM control modes and phase-shift control mode to DC-DC circuit, if detecting
Load phase-shift control mode is then switched into PWM control modes when being less than the difference of switching threshold and return difference value, if detectd
Phase-shift control mode is then switched phase-shift control mode by the load of survey when being more than switching threshold with return difference value sum.
Further, the DC-DC circuit includes phase-shifting full-bridge, transformer T1 and load LOAD, the phase-shifting full-bridge bag
Metal-oxide-semiconductor Q1, metal-oxide-semiconductor Q2, metal-oxide-semiconductor Q3 and metal-oxide-semiconductor Q4, the metal-oxide-semiconductor Q1 and metal-oxide-semiconductor Q2 is included to constitute leading-bridge and pass through inductance
One end of Lr connection transformer T1 primary sides, the metal-oxide-semiconductor Q3 and metal-oxide-semiconductor Q4 constitute lagging leg and connect transformer primary
The other end；One end of the load LOAD is connected with inductance Lo one end, and the inductance Lo other end is respectively through diode D1
With the two ends of diode D2 connection transformer T1 primary sides, the load LOAD other end connects the center of transformer T1 primary sides
Point；Described metal-oxide-semiconductor Q1, metal-oxide-semiconductor Q2, metal-oxide-semiconductor Q3 and metal-oxide-semiconductor Q4 is the metal-oxide-semiconductor of PWM mode control.
Further, the two ends of load electric capacity C also in parallel.
The beneficial effects of the invention are as follows：
The present invention proposes the DC-DC full-bridge circuits that a kind of phase shifting control and pulse width modulation controlled mutually switch, complete at this
In bridge translation circuit, for different loading conditions, be respectively adopted PWM controls and phase shifting control, two kinds of control modes it is mutual
With reference to can effectively reduce the current stress and switching loss of switching tube under small load condition, so as to ensure that gamut is loaded
In the case of have higher efficiency.
By introducing the design method of the present invention in server power supply, when effectively increasing the small load of server power supply
Efficiency, enhances the competitiveness of product.
Brief description of the drawings
With reference to Figure of description, the present invention will be described.
Fig. 1 is flow chart of the method for the present invention；
Fig. 2 is DC-DC circuit schematic diagram of the invention.
Embodiment
For the technical characterstic for illustrating this programme can be understood, below by embodiment, and its accompanying drawing is combined, to this hair
It is bright to be described in detail.Following disclosure provides many different embodiments or example is used for realizing the different knots of the present invention
Structure.In order to simplify disclosure of the invention, hereinafter the part and setting of specific examples are described.In addition, the present invention can be with
Repeat reference numerals and/or letter in different examples.This repetition is that for purposes of simplicity and clarity, itself is not indicated
Relation between various embodiments are discussed and/or set.It should be noted that part illustrated in the accompanying drawings is not necessarily to scale
Draw.Present invention omits the description to known assemblies and treatment technology and process to avoid being unnecessarily limiting the present invention.
A kind of DC-DC circuit design method of changeable phase shifting control and pulse-width controlled of the present invention, is carried out to load first
Detecting, then judges the size of load, and PWM control modes or phase shifting control side are used to DC-DC circuit according to different loads
Formula.
As shown in figure 1, method of the present invention comprises the following steps：
1) test is trained, is determined to carry out the switching threshold of phase-shifting full-bridge and PWM control mode switchings according to overall efficiency
Value；
2) load is detected；
3) DSP can judge the size of load, it is determined that the control mode taken DC-DC circuit；
4) switching of PWM control modes and phase-shift control mode is carried out to DC-DC circuit.
In the above method, the control mode process that the determination is taken DC-DC circuit is：If the load of detecting
PWM control modes are then used less than switching threshold, if the load of detecting uses phase-shift control mode more than switching threshold.
In the above method, when carrying out the switching of PWM control modes and phase-shift control mode to DC-DC circuit, if detectd
Phase-shift control mode is then switched to PWM control modes by the load of survey when being less than the difference of switching threshold and return difference value, if
Phase-shift control mode is then switched phase-shift control mode by the load of detecting when being more than switching threshold with return difference value sum.
As shown in Fig. 2 DC-DC circuit of the present invention includes phase-shifting full-bridge, transformer T1 and load LOAD, the shifting
Phase full-bridge includes metal-oxide-semiconductor Q1, metal-oxide-semiconductor Q2, metal-oxide-semiconductor Q3 and metal-oxide-semiconductor Q4, the metal-oxide-semiconductor Q1 and metal-oxide-semiconductor Q2 and constitutes leading-bridge simultaneously
By one end of inductance Lr connection transformer T1 primary sides, the metal-oxide-semiconductor Q3 and metal-oxide-semiconductor Q4 constitute lagging leg and connect transformation
The other end of device primary side；One end of the load LOAD is connected with inductance Lo one end, the inductance Lo other end respectively through
Diode D1 and diode D2 connection transformer T1 primary sides two ends, load LOAD other end connection transformer T1 primary sides
Central point；Described metal-oxide-semiconductor Q1, metal-oxide-semiconductor Q2, metal-oxide-semiconductor Q3 and metal-oxide-semiconductor Q4 is the metal-oxide-semiconductor of PWM mode control；It is described negative
The two ends of load electric capacity C also in parallel.
The loss of the full-bridge DC/DC converter of phase-shifting full-bridge control has circulation loss, turn-on consumption, turn-off power loss etc.；PWM
The loss of the full-bridge converter of control has turn-on consumption, turn-off power loss etc..Under the conditions of underloading, the loss of PWM mode converter will
It is slightly less than the converter of PS control modes.Under PWM control modes, the loss of converter will increase with the increase of load.
Due to the influence of phase-shifting full-bridge dcdc converter resonant inductance, with the increase of load, resonant inductance and switch junction capacitance
Oscillation amplitude also increases therewith, and the loss turned on and off is also accordingly increased.When reach some load point, PWM mode
Loss will be greater than the loss of phase-shifting full-bridge control mode.
Compared with prior art, the invention has the characteristics that：
1) different loading conditions is directed to, PWM controls or phase shifting control is respectively adopted；Due to circulation loss and open, close
Breakdown consume consumption is difficult accurately to extract, therefore PWM and the switching point of phase-shifting full-bridge control are determined by judging overall efficiency.It is real
The overall efficiency of gamut is tested on border, it is determined that phase-shifting full-bridge and the switching point of PWM control modes.In order to avoid both of which
Frequent switching, leaves appropriate return difference, and last software exchange action is that load is less than certain carrying capacity for PWM mode, and load is more than
Certain carrying capacity is phase-shifting full-bridge mode.It is fairly easy that this control mode is realized using DSP.DSP first can judge load
Size, it is determined that the control mode taken, it is PWM mode that load, which is less than certain carrying capacity, and it is that phase shift is complete that load, which is more than certain carrying capacity,
Bridge mode.
2) efficiency of server power supply low-load scope is improved, and the raising of so-called gamut internal efficiency is to be directed to full model
In enclosing it is all the server power supply of phase shifting control, therefore introduces the load smaller than switching point and controlled using PWM.
3) in order to avoid the frequent switching of both of which, appropriate return difference is left, last software exchange action is load
It is PWM mode less than certain carrying capacity, it is phase-shifting full-bridge mode that load, which is more than certain carrying capacity,.This control mode is realized using DSP is
It is fairly easy.DSP first can judge the size (according to load detecting point signal) of load, it is determined that the controlling party taken
Formula, Q1, Q2, Q3 and Q4 control mode are PWM mode (traditional full-bridge control mode), load when load is less than certain carrying capacity
Q1, Q2, Q3 and Q4 control mode are phase-shifting full-bridge mode during more than certain carrying capacity.
Simply the preferred embodiment of the present invention described above, for those skilled in the art,
Without departing from the principles of the invention, some improvements and modifications can also be made, these improvements and modifications are also regarded as this hair
Bright protection domain.
Claims (6)
1. the DC-DC circuit design method of a kind of changeable phase shifting control and pulse-width controlled, it is characterized in that, load is carried out first
Detecting, then judges the size of load, and PWM control modes or phase shifting control side are used to DC-DC circuit according to different loads
Formula.
2. the DC-DC circuit design method of a kind of changeable phase shifting control and pulse-width controlled according to claim 1, it is special
Levying is, described method comprises the following steps：
1) test is trained, is determined to carry out the switching threshold of phase-shifting full-bridge and PWM control mode switchings according to overall efficiency；
2) load is detected；
3) DSP can judge the size of load, it is determined that the control mode taken DC-DC circuit；
4) switching of PWM control modes and phase-shift control mode is carried out to DC-DC circuit.
3. the DC-DC circuit design method of a kind of changeable phase shifting control and pulse-width controlled according to claim 2, it is special
Levying is, the control mode process that the determination is taken DC-DC circuit is：If the load of detecting is less than switching threshold
Using PWM control modes, if the load of detecting uses phase-shift control mode more than switching threshold.
4. the DC-DC circuit design method of a kind of changeable phase shifting control and pulse-width controlled according to claim 3, it is special
Levying is, when carrying out the switching of PWM control modes and phase-shift control mode to DC-DC circuit, if the load of detecting is small
Phase-shift control mode is then switched into PWM control modes when the difference of switching threshold and return difference value, if the load of detecting
Phase-shift control mode is then switched into phase-shift control mode during more than switching threshold and return difference value sum.
5. the DC-DC circuit of a kind of changeable phase shifting control and pulse-width controlled according to Claims 1-4 any one is set
Meter method, it is characterized in that, the DC-DC circuit includes phase-shifting full-bridge, transformer T1 and load LOAD, and the phase-shifting full-bridge includes
Metal-oxide-semiconductor Q1, metal-oxide-semiconductor Q2, metal-oxide-semiconductor Q3 and metal-oxide-semiconductor Q4, the metal-oxide-semiconductor Q1 and metal-oxide-semiconductor Q2 constitute leading-bridge and pass through inductance Lr
One end of transformer T1 primary sides is connected, the metal-oxide-semiconductor Q3 and metal-oxide-semiconductor Q4 constitute lagging leg and connect transformer primary
The other end；One end of the load LOAD is connected with inductance Lo one end, the inductance Lo other end respectively through diode D1 and
The two ends of diode D2 connection transformer T1 primary sides, the load LOAD other end connects the central point of transformer T1 primary sides；
Described metal-oxide-semiconductor Q1, metal-oxide-semiconductor Q2, metal-oxide-semiconductor Q3 and metal-oxide-semiconductor Q4 is the metal-oxide-semiconductor of PWM mode control.
6. the DC-DC circuit design method of a kind of changeable phase shifting control and pulse-width controlled according to claim 5, it is special
Levying is, the two ends electric capacity C also in parallel of the load.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710433134.6A CN107147299A (en) | 2017-06-09 | 2017-06-09 | A kind of DC DC circuit design methods of changeable phase shifting control and pulse-width controlled |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710433134.6A CN107147299A (en) | 2017-06-09 | 2017-06-09 | A kind of DC DC circuit design methods of changeable phase shifting control and pulse-width controlled |
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| CN107147299A true CN107147299A (en) | 2017-09-08 |
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| CN201710433134.6A Pending CN107147299A (en) | 2017-06-09 | 2017-06-09 | A kind of DC DC circuit design methods of changeable phase shifting control and pulse-width controlled |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1555128A (en) * | 2003-12-19 | 2004-12-15 | 艾默生网络能源有限公司 | Control method and device for series resonant 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 |
| CN103683999A (en) * | 2013-12-30 | 2014-03-26 | 四川英杰电气股份有限公司 | Grid connected inverter and output filtering method thereof |
-
2017
- 2017-06-09 CN CN201710433134.6A patent/CN107147299A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1555128A (en) * | 2003-12-19 | 2004-12-15 | 艾默生网络能源有限公司 | Control method and device for series resonant 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 |
| CN103683999A (en) * | 2013-12-30 | 2014-03-26 | 四川英杰电气股份有限公司 | Grid connected inverter and output filtering method thereof |
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Application publication date: 20170908 |