CN107124104A - DC/DC conversion equipments - Google Patents
DC/DC conversion equipments Download PDFInfo
- Publication number
- CN107124104A CN107124104A CN201610104203.4A CN201610104203A CN107124104A CN 107124104 A CN107124104 A CN 107124104A CN 201610104203 A CN201610104203 A CN 201610104203A CN 107124104 A CN107124104 A CN 107124104A
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- Prior art keywords
- circuit
- switch
- voltage
- drive division
- direct current
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Classifications
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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
-
- 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
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/0048—Circuits or arrangements for reducing losses
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Abstract
The invention provides a kind of DCDC conversion equipments, including：The supply voltage of direct current is converted into direct current output by voltage conversion circuit, the voltage conversion circuit, including resonance circuit and makes supply voltage put on the resonance circuit in different directions to generate multiple power switch components of direct current output；Switch control drive division, switch control drive division controls being turned on or off for multiple power switch components, to generate direct current output to multiple power switch component output control signals；And converter section, the converter section is connected with switch control drive division, and be connected via voltage conversion circuit with supply voltage, in initial start up phase, converter section provides power supply using supply voltage to switch control drive division, in normal work stage, power supply is provided to switch control drive division using direct current output.Using the DCDC conversion equipments of the present invention, the overall power efficiency of DC-DC converter is improved, and reduces manufacturing cost, simplifies circuit structure.
Description
Technical field
The present invention relates to a kind of DC/DC conversion equipments, more particularly to one kind can be in initial start up phase
The DC/DC conversion equipments of operating voltage are provided using direct current power source voltage to switch drive control unit.
Background technology
In the prior art, Switching Power Supply is to utilize modern power electronics technology, controlling switch closure and
The time ratio of disconnection, maintains a kind of power supply of regulated output voltage, wherein, DC/DC conversion equipments are
DC-to-dc change-over circuit is a kind of DC input voitage to be efficiently converted into fixed direct current output
The voltage changer of voltage.In general, DC/DC conversion equipments are divided into three classes：Step-up DC/DC becomes
Parallel operation, voltage-dropping type DC/DC converters and buck-boost type DC/DC converters, can be used according to demand
Three classes are controlled.Specifically, using capacitor, the characteristic of the energy storage of inductor, gate-controlled switch is passed through
(MOSFET etc.) carries out the action of HF switch, by the electrical power storage of input in capacitor or inductor,
When the switches are opened, electric energy is released to load again to provide energy.Its export power or voltage with
The ratio in the cycle of dutycycle, i.e. switch conduction times with entirely switching is relevant.
However, with the high speed development of Power Electronic Technique, Switching Power Supply is proposed more high frequency,
The requirement such as high conversion efficiency, high power density, miniaturization and low noise.
Fig. 5 shows a kind of existing DC/DC conversion equipments for employing LLC full-bridge change-over circuits.Such as
Shown in Fig. 3, the DC/DC conversion equipments have the LC resonance circuits being made up of inductor Lr and capacitor Cr,
And the transformer being made up of inductor Tr1 and Tr2.In addition, in the DC/DC conversion equipments, in addition to
4 switch element Q1~Q4 of LLC full-bridge change-over circuits are constituted, by controlling each switch element
Q1~Q4 conducting and disconnection, it is electric from the primary side inductor Tr1 of transformer to secondary so as to control
The energy that sensor Tr2 is transmitted.
In the DC/DC conversion equipments shown in Fig. 5, switch element Q1~Q4 conducting and disconnection is by opening
Pass driver element, which is controlled, (eliminates the grid of switch drive unit and switch element Q2~Q4 in figure
Between connection).Switch drive unit in time carries out leading on/off by controlling switch element Q1~Q4
Switching is opened, with converting power source voltage-drop loading in the direction on LC resonant tanks, and then DC-DC is realized
Voltage transformation.As an example, N-channel MOS is all used there is illustrated switch element Q1~Q4
The situation of transistor.In the case, switch drive unit is by giving the G poles one of MOS transistor
High level signal so that switch is open-minded.
As shown in fig. 6, proposing a kind of similar LLC converter in patent document 1, wherein high side drives
Device Z1 controlling switch elements Q1 and Q2 are turned on and disconnected, so that DC voltage E is converted into wishing
The direct current output Vout of prestige.
But as shown in Figure 5 and Figure 6 in the prior art, DC-DC converter is extra outer usually using one
Portion's power supply is powered to switch driver element.For example, Fig. 5 switch drive unit is by extra external power source
It is powered, Fig. 6 high-side driver Z1 is then powered by extra power Vcc 1.
Prior art literature
Patent document
Patent document 1：Japanese Patent Laid-Open 2015-216720
The content of the invention
Invent problem to be solved
However, in these cases, the efficiency of external power source is generally not so good as the effect of DC-DC converter in itself
Rate is high, the use of external power source certainly bring a part of loss.On the other hand, external power source is set
The problems such as will also result in cost increase and complicated circuit structure.
Technological means for solving technical problem
The present invention designs to solve the above problems, and it is an object of the invention to provide one kind
DC/DC conversion equipments, can avoid using external power source, so as to improve the overall work(of DC-DC converter
Rate efficiency, and manufacturing cost is reduced, simplify circuit structure.
DCDC conversion equipments involved by first aspect present invention, including：Voltage conversion circuit, the electricity
The supply voltage of direct current is converted into direct current output by voltage conversion circuit, including resonance circuit and is made described
Multiple power that supply voltage puts on the resonance circuit to generate the direct current output in different directions are opened
Close element；And switch controls drive division, the switch controls drive division to the multiple power switch
Element output control signal, controls being turned on or off for the multiple power switch component, to generate
Direct current output is stated, the DCDC conversion equipments are characterised by, in addition to：Converter section, the converter section
It is connected with the switch control drive division, and via the voltage conversion circuit and the supply voltage
It is connected, in the initial start up phase of the DCDC conversion equipments, the converter section utilizes the power supply
Voltage controls drive division to provide power supply to the switch, in the normal work rank of the DCDC conversion equipments
Section, controls drive division to provide power supply using the direct current output to the switch.
In DC/DC conversion equipments involved by second aspect of the present invention, the resonance circuit includes resonance
Inductance, the converter section includes power supply inductance, by between the resonant inductance and the power supply inductance
Electromagnetic coupled, the converter section using the supply voltage to it is described switch control drive division provide electricity
Source.
In DC/DC conversion equipments involved by third aspect present invention, the voltage conversion circuit is also wrapped
Include：The transformer being connected in series with the resonance circuit；And it is connected to the resonance circuit and transformation
Switching circuit between the tie point of device (Tr) and ground connection, the converter section includes：Input lateral circuit,
The input lateral circuit control at least one power switch component in the multiple power switch component with
And the switching circuit is turned on or off；Lateral circuit is exported, the output lateral circuit includes power supply electricity
Sense, the power supply inductance and the resonant inductance electromagnetic coupled in the resonance circuit, thus using described
Supply voltage controls drive division to provide power supply to the switch.
In DC/DC conversion equipments involved by fourth aspect present invention, the input lateral circuit includes
Shake device, and the vibration generator receives power supply from the supply voltage, in the initial start up phase, described
The frequency for shaking device to set makes at least one described power switch component be turned on or off repeatedly, and makes
Switching circuit conducting, in the normal work stage, the vibration generator not to it is described at least one
Power switch component is controlled, and disconnects the switching circuit.
In DC/DC conversion equipments involved by fifth aspect present invention, the vibration generator is described initial
Startup stage also makes in the multiple power switch component in addition at least one described power switch component
Another power switch component conducting.
In DC/DC conversion equipments involved by sixth aspect present invention, in the vibration generator and the electricity
Power switch is set between the voltage of source, in the initial start up phase, the power switch closure, in institute
Normal work stage is stated, the power switch disconnects.
In DC/DC conversion equipments involved by seventh aspect present invention, the output lateral circuit also includes
Electric capacity and diode, the power supply inductance are in parallel with the electric capacity even with the series circuit of the diode
It is connected between the direct current output and ground connection, the cathode side of the diode and the DC output side phase
Connection, anode-side is connected with the ground side.
In DCDC conversion equipments involved by eighth aspect present invention, the output lateral circuit also includes inspection
The voltage check device of the voltage swing of the direct current output is surveyed, when the voltage check device is detected
Voltage swing more than a predetermined threshold when, from the initial start up phase enter the normal work rank
Section.
In DCDC conversion equipments involved by ninth aspect present invention, the switching circuit is opened including switching
Close the series circuit of element and diode, wherein the source electrode of the switching switch element be connected to it is described humorous
Shake the tie point of circuit and transformer, and the leakage of the anode of the diode and the switching switch element
Pole is connected, negative electrode and grounding connection.
The effect of invention
According to the present invention, due to directly using the output pair of DC-DC converter itself in normal work stage
Switch drive unit is powered, therefore, it is possible to improve the power efficiency that DC-DC converter is overall, and
Manufacturing cost is reduced, simplifies circuit structure.
Brief description of the drawings
Fig. 1 is showing for the general structure for the DC/DC conversion equipments for representing an embodiment of the invention
Meaning property block diagram.
Fig. 2 is the general structure for the DC/DC conversion equipments for representing another embodiment of the invention
Schematic block diagram.
Fig. 3 is the figure of the particular circuit configurations example for the DC/DC conversion equipments for representing Fig. 2.
Fig. 4 is the figure of another particular circuit configurations example for the DC/DC conversion equipments for representing Fig. 2.
Fig. 5 is the schematic diagram of the DC/DC conversion equipments of prior art.
Fig. 6 is the schematic diagram of the DC/DC conversion equipments of prior art.
Embodiment
Below, the DC/DC conversion equipments referring to the drawings involved by 1 pair of embodiments of the present invention are said
It is bright.
Fig. 1 is the schematic of the general structure for the DC/DC conversion equipments for representing embodiments of the present invention
Block diagram.As shown in figure 1, according to an embodiment of the invention, DC/DC conversion equipments have voltage
Change-over circuit 1, the direct current that the supply voltage of direct current is converted into different voltages by the voltage conversion circuit 1 is defeated
Go out Vout.The voltage conversion circuit 1 can generally be turned by such as LLC full-bridges change-over circuit or LLC half-bridges
The voltage conversion circuit comprising resonance circuit such as circuit is changed to constitute.The voltage conversion circuit 1 generally also includes
Supply voltage Vdd is set to put on the resonance circuit in different directions, to generate the multiple of direct current output Vout
Power switch component., hereinafter will also be further on the particular circuit configurations of the voltage conversion circuit 1
It is described in detail.
Also include switch control drive division 2 according to the DCDC conversion equipments of the present invention.Switch control is driven
Dynamic multiple power switch component output control signals of the portion 2 into voltage conversion circuit 1, control theirs
It is turned on or off, to generate above-mentioned direct current output Vout.
It is different from the important component of prior art as the present invention, the present invention is also provided with converter section
3, the converter section 3 is connected with switch control drive division 2, is powered to it.Meanwhile, the converter section 3 also via
Voltage conversion circuit 1 is connected with supply voltage Vdd.
In the initial start up phase of DCDC conversion equipments, converter section 3 utilizes supply voltage Vdd to switch
Drive division 2 is controlled to provide power supply Vin.And after DCDC conversion equipments terminate initial start up phase, enter
When entering normal work stage, then switch to direct current output Vout using DCDC conversion equipments to switch control
Drive division 2 provides power supply Vin.
Above, the initial start up phase of DCDC conversion equipments refers to that supply voltage Vdd is just applied
Voltage conversion circuit 1 is added to, its direct current output Vout not yet reaches that satisfaction switch control drive division 2 works
Stage before required level.In this stage, because direct current output Vout there is no method to cause switch to control
The normal work of drive division 2 processed, accordingly, it would be desirable to be designed so that converter section 3 can utilize supply voltage
Vdd is powered to switch control drive division 2.
And once direct current output Vout reaches the level met needed for switch control drive division 2 works, i.e.
Normal work stage is entered, then converter section 3 will just switch the power supply for controlling drive division 2 from supply voltage
Vdd switches to direct current output Vout.Therefore, compared with prior art (Fig. 5~6), switch control driving
Portion 2 does not simultaneously need extra external power source.In normal work stage, the power supply of switch control drive division 2
Source is the direct current output Vout of DCDC conversion equipments in itself, and its efficiency will be far above external power supply, because
And, using the design of the present embodiment, loss is smaller, and whole efficiency is higher.
In initial start up phase, although converter section 3 as shown in Figure 1 directly can provide supply voltage Vdd
It is powered to switch control drive division 2, but due to needing to consider the thing such as voltage matches or electrical isolation
, therefore it is preferable to use technical scheme as shown in Figure 2.That is, via in voltage conversion circuit 1
Component, indirectly by supply voltage Vdd be supplied to switch control drive division 2 be powered.In this way,
Then because the items such as above-mentioned electrical isolation make it that the overall stability of the DCDC conversion equipments of the present embodiment is higher.
Below, referring to the drawings 3, to a particular circuit configurations of the DC/DC conversion equipments shown in Fig. 2
Example is illustrated.It is readily appreciated by a person skilled in the art that particular circuit configurations example depicted herein
It is not from the limited effect, as long as it can be supplied using supply voltage Vdd to switch control drive division 2
Electricity, other circuit structures are also applied for the present invention.
As shown in figure 3, equivalent to the voltage conversion circuit 1 in Fig. 1 LLC full-bridges change-over circuit include by
Series resonant circuit and multiple switch element Q1~Q4 that resonant inductance Lr and resonant capacitance Cr is constituted.
Series resonant circuit is electrically connected via multiple switch element Q1~Q4 with supply voltage Vdd.Pass through switching
Multiple switch element Q1~Q4 conducting and disconnection, so as to make supply voltage Vdd and series resonance electricity
The electrical connection on road is turned on or off, and can make the side of supply voltage put on the series resonant circuit
Switch between different directions.Also gone here and there on the series resonant circuit being made up of inductance Lr and electric capacity Cr
Connection is connected with transformer primary side inductance Tr1.Transformer secondary inductance Tr2 and commutation diode P1, P2 with
And output capacitor Co etc. constitutes the output section of LLC full-bridge change-over circuits together.The output section is to load
RLExport direct current output Vout.Switch control drive division 2 is respectively to multiple switch element Q1~Q4 grid
Pole exports gate drive signal S1~S4 respectively, with controlling switch element Q1~Q4 ON/OFF.
Constituted above for the physical circuit of LLC full-bridge change-over circuits, with prior art (figure in the present invention
5) difference is had no, is repeated no more here.
As the important inventive point of the present invention, the present invention is provided with also in LLC full-bridge change-over circuits and cut
Change circuit 15.The switching circuit 15 includes switch element Q5 and diode D5 series circuit, wherein opening
The source electrode for closing element Q5 is connected to the same transformation of resonance circuit being made up of resonant inductance Lr and resonant capacitance Cr
On the tie point of device (Tr), and diode D5 anode is connected with switch element Q5 drain electrode, negative electrode
With grounding connection.That is, diode D5 polarity and switch element Q5 body diode opposite polarity.Thus
It can prevent reverse current from flowing through switch element Q5.Certainly, the present invention is not limited thereto, can also use
The channel type switch element opposite with switch element Q5 replaces diode D5, for example, this embodiment party
Switch element Q5 uses N-channel MOS FET in formula, then can be replaced with P-channel MOSFET
Diode D5.In addition, as long as ON/OFF loop can be played a part of, other circuit structures
It is equally applicable to the switching circuit 15 of the present invention.
In addition, being also provided with the conversion being made up of input lateral circuit 31 and output lateral circuit 32 in the present invention
Portion 3, to be powered to switch control drive division 2.Input lateral circuit 31 is used for controlling LLC full-bridge change-over circuits
Middle switch element Q1 and switching circuit 15 are turned on or off.Exporting lateral circuit 32 includes power supply inductance
Lraux, the power supply inductance Lraux and the resonant inductance Lr electromagnetic coupleds in resonance circuit, thus initial
Startup stage provides power supply Vin using supply voltage Vdd to switch control drive division 2.Export lateral circuit 32
Also it is connected via diode D7 with the direct current output Vout of LLC full-bridge change-over circuits, thus, via
Pol circuits, power supply Vin is provided using direct current output Vout to switch control drive division 2.The Pol circuits
It is a kind of voltage conversion device or circuit, Vout to be changed into required for switch control drive division 2
Voltage.That is, in initial start up phase, due to the input controlling switch element Q1 of lateral circuit 31 and
Switch element Q5 action so that the electric current on inductance Lr produces change, and then electric current can be because of electromagnetism
Inductive transfer is to the inductance Lraux of powering so that power supply Vin indirectly interim can drive to switch control
Dynamic portion 2 powers.
If in addition, directly using supply voltage Vdd as switch element Q1~4 operating voltage originate, this
The method of sample needs to cause the state of four switch element Q1~4 constantly to switch change simultaneously, due to electric
The each side reason such as environment, can produce certain noise, and this control to switch element Q1~4 can be produced
Influence.
In the present embodiment, switching circuit 15 is set, electric current transmission switch is controlled into drive division using inductance Lr
2 power supplies, input lateral circuit 31 is only needed to so that switch element Q1 state is constantly switched, now,
The state of switch element Q5 and Q2~4 does not change in initial start up phase, by the shadow of noise
Ringing can very little.
Certainly, control of the input lateral circuit 31 to switch element Q1, Q5 can have a variety of modes, example
Such as, controlling switch element Q5 is opened with certain frequency, disconnected, while controlling switch element Q1 is led always
Lead to, or controlling switch element Q1 conductings once disconnect afterwards, while controlling switch element Q5 is constantly on,
Or controlling switch element Q1, Q5 are opened with certain frequency, disconnected simultaneously.As long as it can cause
Electric current can produce the method for change on inductance Lr.
More specifically, input lateral circuit 31 includes vibration generator 10, the vibration generator 10 and power supply electricity
Vdd connections are pressed, the operating voltage for supply voltage Vdd obtain after partial pressure by resistance R1 and R2 is obtained.
It is specific that the raster data model letter being controlled to switch element Q1 and Q5 grid is exported by the vibration generator 10
Number G1 and G5.Inputting lateral circuit 31 also includes the voltage-regulator diode D6 and storage capacitor in parallel with resistance R2
C1, to stablize the power supply of vibration generator 10.Herein, in order to reduce cost, resistance in lateral circuit 31 is inputted
Caused by the elements such as R1 and R2 and supply voltage Vdd collective effects to vibration generator 10 and switch element Q1
Power supply itself efficiency with Q5 is general, but because the power supply exists only in initial start up phase, to DCDC
The influence of the overall efficiency of conversion equipment is smaller.
In addition, vibration generator 10 can be with chip type oscillator (such as 555 oscillators), Resonant tube circuit (such as
LC oscillator circuits etc.) level signal output is provided, it is with low cost, and as noted previously, as only need to
The state for controlling a switch element (such as switch element Q1) by level signal is changed repeatedly, DCDC
The noise resistance interference performance of conversion equipment is improved.In addition to the inductance Lraux that powers, lateral circuit is exported
32 also include electric capacity C2 and diode D8, power supply inductance Lraux and diode D8 series circuit and electricity
Hold C2 to be connected in parallel between direct current output Vout and ground connection.Diode D8 negative electrode and direct current output
Vout sides are connected, and anode is connected via power supply inductance Lraux with ground connection.Due in normal work stage,
Switch control drive division 2 can be powered by direct current output Vout, therefore two poles are set as described above
Pipe D8, can prevent direct current output Vout electric current to be back to resonant inductance Lr via power supply inductance Lraux.
The course of work to the DCDC conversion equipments of the present invention is illustrated below.
When DC-DC converter just starts (initial start up phase), supply voltage Vdd is just applied to
Voltage conversion circuit 1 (the LLC full-bridges change-over circuit in Fig. 3), now because of switch element Q1~Q4 still
Do not work, therefore the direct current output Vout of output section is 0, it is impossible to supplied to switch control drive division 2
Electricity.
Now, after supply voltage Vdd is via resistance R1, R2 partial pressure, powered to vibration generator 10.Vibration generator
10 export gate drive signal G1 with a setpoint frequency to switch element Q1 grid immediately, with the setting
Frequency ON/OFF switch element Q1 repeatedly.Meanwhile, vibration generator 10 is also to switch element Q5 grid
Gate drive signal G5 is exported, makes its constantly on.And switch element Q2~Q4 is driven due to switch control
Dynamic portion 2 is not powered, it is impossible to gate drive signal S2~S4 is provided to their grid, so being in
Off-state.
Thus, formd from supply voltage via switch element Q1, switch element Q5 up between ground connection
One loop, electric current is according to above-mentioned setpoint frequency, the fluctuating change on the loop.
Electric current on resonant inductance Lr can produce change, and be transferred in the output lateral circuit 32 of converter section 3
Power supply inductance Lraux sides.The induced electromotive force that power supply inductance Lraux is produced is used to switch control
Drive division 2 provides supply voltage Vin.The energy storage inductor C2 in parallel with power supply inductance Lraux is used to stabilization
Supply voltage Vin.Certainly, the insensitive feelings of fluctuation of the switch control drive division 2 to supply voltage Vin
Under condition, energy storage inductor C2 nor is it necessary that.In addition, the diode D8 quilts in output lateral circuit 32
For preventing output end current (electric current that Vout is produced) from reversely flowing to resonance via power supply inductance Lraux
Inductance Lr, so as to influence the work of resonance circuit.
After switch control drive division 2 is powered, start controlling switch element Q1~Q4 and moved according to set
It is switched on or off.Now, the direct current output Vout of the output section of voltage conversion circuit 1 can produce defeated
Go out voltage, and step up to the level that can be powered to the normal offer of switch control drive division 2.
When direct current output Vout is higher than a predetermined threshold, i.e., it is transferred to normal work from initial start up phase
Stage, switch control drive division 2 transfers to be powered by VD Vout.Now, starting of oscillation
Device 10 does not continue to be controlled power switch component Q1, and the switching circuit (15) is broken
Open.That is, power switch component Q1~Q4 control is given back into switch control drive division 2.Voltage turns
Circuit 1 is changed to turn beginning normal voltage that performs as prior art (Fig. 5) with switch control drive division 2
Move work.
After normal work stage is transferred to from initial start up phase, the work of vibration generator 10 can also be stopped,
To save meaningless power consumption.Here, as an example, show in supply voltage Vdd to vibration generator
Switch K1 is set on the path of 10 power supplies, the mode of electrical connection is disconnected when needed to stop vibration generator 10
Work.Above-mentioned disconnection switch K1 signal can be sent by switch control drive division 2.
Certainly the present invention is not limited thereto or by sending the letter being stopped to vibration generator 10
Number etc. stop its work.
As described above, above-mentioned threshold value, which should be greater than being equal to, ensure that the switch control normal work of drive division 2
The size of work.Previously according to the switch used the specification of drive division 2 can be controlled to set.Such as Fig. 3
It is shown, a voltage detector 12 can be set whether to enter direct current output Vout more than above-mentioned threshold value
Row judges.Certain judgement can also be carried out by switch control drive division 2 oneself.
In addition, in described above, vibration generator 10 only sends raster data model letter to switch element Q1 and Q5
Number G1 and G5, however, the vibration generator 10 of the present invention is preferably additionally coupled to Q4, and in initial start rank
Duan Xiangqi grids send gate drive signal G4, make its constantly on.By so, transformer Tr quilts
Short circuit, so, energy is not had and is transferred to secondary output by transformer Tr.
In addition, directly providing Vdd mode compared to Fig. 1, initially opened in Fig. 2 to Fig. 4 embodiment
The dynamic stage is to be powered by Lr and Lraux electromagnetic coupled to switch control drive division 2, so
One, by transmitting electric energy in a coupled manner across coil, the requirement of electrical isolation can be met.
That is, due to not having between the power generation circuit with electrical circuit and voltage conversion circuit 2 of switch control drive division 2
There is direct electrical connection, therefore, it is possible to reduce interfering between the two circuits.If for example, opening
Close control drive division 2 occurs in that the failures such as ground connection with electrical circuit side, if not using electrical isolation,
Directly be connected with power supply Vdd, then the power generation circuit of voltage conversion circuit 2 may be affected by it and
Cisco unity malfunction.
In addition, although the voltage conversion circuit 1 of the present invention is used as using LLC full-bridges change-over circuit in Fig. 3
Example is illustrated, but is not limited to this.Technology explanation more than, ordinary skill people
As long as member it is understood that comprising the series resonant circuit being made up of Lr and Cr mentioned as the present invention this
Sample it is resonance circuit, carry out the rectification of voltage transformation and rectification using the cyclically-varying of electric current
Circuit, may be suitable for the present invention.For example, it is suitable for shown in Fig. 4, pass through omit
LLC half-bridge change-over circuits formed by Q3 and Q4 in Fig. 3.
The present invention can carry out various implementations in the case where not departing from the broad spirit and scope of the present invention
Mode and deformation.In addition, above-mentioned embodiment is only used for, the present invention will be described, without to the present invention
Scope be defined.That is, the scope of the present invention is represented by the scope of claim, without by above-mentioned
Embodiment is represented.Also, within the scope of the claims and the scope with its equal invention meaning
Interior implemented various modifications are also considered as within the scope of the invention.
Label declaration
1 voltage conversion circuit
2 switch control drive divisions
3 converter sections
10 vibration generators
12 voltage detectors
15 switching circuits
31 input lateral circuits
32 output lateral circuits
Cr resonant capacitances
C1, C2 storage capacitor
D5, D7, D8, P1, P2 diode
D6 voltage-regulator diodes
G1, G4, G5, S1~S4 gate drive signals
K1 is switched
Lr resonant inductances
Lraux powers inductance
Q1~Q4 switch elements
R1, R2 divider resistance
RLLoad
Tr1 transformer primary side inductance
Tr2 transformer secondary inductance
Vdd supply voltages
Vout direct current outputs
Vin supply voltages.
Claims (9)
1. a kind of DCDC conversion equipments, including：
The supply voltage of direct current is converted into direct current output by voltage conversion circuit, the voltage conversion circuit,
Including resonance circuit and the supply voltage is set to put on the resonance circuit in different directions to generate
State multiple power switch components of direct current output；And
Switch control drive division, the switch control drive division is exported to the multiple power switch component
Control signal, controls being turned on or off for the multiple power switch component, defeated to generate the direct current
Go out,
The DCDC conversion equipments are characterised by, in addition to：
Converter section, the converter section is connected with the switch control drive division, and turns via the voltage
Circuit is changed with the supply voltage to be connected,
In the initial start up phase of the DCDC conversion equipments, the converter section utilizes the supply voltage
Drive division is controlled to provide power supply to the switch, in the normal work stage of the DCDC conversion equipments,
Drive division is controlled to provide power supply to the switch using the direct current output.
2. DCDC conversion equipments as claimed in claim 1, it is characterised in that the resonance circuit bag
Resonant inductance is included, the converter section includes power supply inductance, passes through the resonant inductance and power supply electricity
Electromagnetic coupled between sense, the converter section controls drive division using the supply voltage to the switch
Power supply is provided.
3. DCDC conversion equipments as claimed in claim 1, it is characterised in that the voltage conversion electricity
Road also includes：
The transformer being connected in series with the resonance circuit；And
The switching circuit between the resonance circuit and the tie point of transformer and ground connection is connected to,
The converter section includes：
Lateral circuit is inputted, the input lateral circuit controls at least one in the multiple power switch component
Individual power switch component and the switching circuit are turned on or off；
Export lateral circuit, the output lateral circuit include power supply inductance, the power supply inductance with it is described humorous
The resonant inductance electromagnetic coupled shaken in circuit, is thus driven using the supply voltage to the switch control
Dynamic portion provides power supply.
4. DCDC conversion equipments as claimed in claim 3, it is characterised in that the input lateral circuit
Including vibration generator, the vibration generator receives power supply from the supply voltage,
In the initial start up phase, the vibration generator makes at least one described power with the frequency set
Switch element is turned on or off repeatedly, and turns on the switching circuit,
In the normal work stage, the vibration generator does not enter at least one described power switch component
Row control, and disconnect the switching circuit.
5. the DCDC conversion equipments as described in claim 3 or 4, it is characterised in that the vibration generator exists
The initial start up phase also makes in the multiple power switch component except at least one described power switch
Another power switch component conducting outside element.
6. DCDC conversion equipments as claimed in claim 4, it is characterised in that in the vibration generator and
Power switch is set between the supply voltage, in the initial start up phase, the power switch is closed
Close, in the normal work stage, the power switch disconnects.
7. DCDC conversion equipments as claimed in claim 3, it is characterised in that the output lateral circuit
Also include electric capacity and diode,
The series circuit of the power supply inductance and the diode is connected in parallel described straight with the electric capacity
Between stream output and ground connection,
The cathode side of the diode is connected with the DC output side, anode-side and the ground side
It is connected.
8. DCDC conversion equipments as claimed in claim 3, it is characterised in that the output lateral circuit
Also include the voltage check device for detecting the voltage swing of the direct current output, when voltage detecting dress
When putting the voltage swing detected more than a predetermined threshold, from the initial start up phase enter it is described just
Normal working stage.
9. DCDC conversion equipments as claimed in claim 3, it is characterised in that the switching circuit bag
The series circuit of switching switch element and diode is included, wherein the source electrode connection of the switching switch element
In the resonance circuit and the tie point of transformer, and the anode of the diode is switched with the switching
The drain electrode connection of element, negative electrode and grounding connection.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610104203.4A CN107124104B (en) | 2016-02-25 | 2016-02-25 | DC/DC converter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610104203.4A CN107124104B (en) | 2016-02-25 | 2016-02-25 | DC/DC converter |
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| CN107124104A true CN107124104A (en) | 2017-09-01 |
| CN107124104B CN107124104B (en) | 2020-04-21 |
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| CN111181431A (en) * | 2020-01-15 | 2020-05-19 | 北京天岳京成电子科技有限公司 | Multi-level boost inverter |
| CN111181432A (en) * | 2020-01-15 | 2020-05-19 | 北京天岳京成电子科技有限公司 | Inverter circuit |
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| Publication number | Publication date |
|---|---|
| CN107124104B (en) | 2020-04-21 |
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