CN108599554A - A kind of bipolarity buck-boost direct current converter - Google Patents
A kind of bipolarity buck-boost direct current converter Download PDFInfo
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- CN108599554A CN108599554A CN201810438070.3A CN201810438070A CN108599554A CN 108599554 A CN108599554 A CN 108599554A CN 201810438070 A CN201810438070 A CN 201810438070A CN 108599554 A CN108599554 A CN 108599554A
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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
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
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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
- H02M1/14—Arrangements for reducing ripples from dc input or output
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
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- Dc-Dc Converters (AREA)
Abstract
The invention discloses a kind of bipolarity buck-boost direct current converters, anode lifting die block and cathode including common ground connection setting lift die block, and the anode lifting die block includes the positive switch power supply unit being connected in turn between power input and ground, positive filter unit and positive load resistance R1；The cathode lifting die block includes the negative switch power supply unit being connected in turn between power input and ground, cathode filter unit and cathode load resistance R2.The present invention has transfer efficiency higher, and voltage ripple is small, and stability and reliability are preferable, it is easy to accomplish the advantages that miniaturization and lightweight.
Description
Technical field
The present invention relates to the DC voltage converter technical fields using on-off mode, in particular to a kind of bipolarity liter
Step down DC converter.
Background technology
It is higher and higher to the performance requirement of power supply with information-based extensive universal and electronic equipment fast development,
Requirement to its power density and transfer efficiency is also higher and higher；The high frequency of power electronic devices is the inexorable trend of development,
High frequency makes the power density higher of device, miniaturization, the lightweight of realization device.The frequency of converting means is improved to improving
Working efficiency and energy conservation and environmental protection have far reaching significance.High frequency is but also power electronic technique is deep into more fields.But it crosses
High frequency will produce larger switching loss and switching noise, while can be brought to prime control signal generating circuit serious
Electromagnetic interference.Voltage and frequency can be fluctuated in the conversion of electric energy so that the efficiency of conversion is not fully up to expectations, with product
Requirement to frequency is higher and higher, and traditional technology does transformation of electrical energy using Schottky diode and IGBT and has been unable to meet performance
It is required that the frequency that uses of mainstream for 600KHZ hereinafter, its frequency also has prodigious development space.
Gallium nitride device chemical stability is good, high temperature resistant, and thermal diffusivity is good, is suitble in high-power lower work, gallium nitride material
Research and application be current semiconductor applications hot spot, frequency and the far super silicon of power characteristic, silicon carbide and other are all partly
Conductor device, gallium nitride chip is small, and integrated level is high, can greatly improve transfer efficiency, is applied in power electronic technique
Various fields, such as Switching Power Supply, inverter, rectifier, frequency converter.For regular tap device MOSFET, nitrogen
Change the reflected low on state resistance of gallium, push power electronics industry high frequency without advantages such as backward dioded, high frequencies
Development, but different from for routine MOSFET, gallium nitride needs positive/negative-pressure driving circuit, current positive/negative-pressure driving circuit to exist
The problems such as volume is big, reliability is low, this runs in the opposite direction with the high power density brought after power electronic equipment high frequency, because
How this, provide that transfer efficiency is higher, and voltage ripple is small, and stability and reliability are preferable, it is easy to accomplish miniaturization and lightweight
Positive/negative-pressure driving circuit become urgent problem to be solved.
Invention content
In view of the above shortcomings of the prior art, the technical problem to be solved by the present invention is to：How a kind of conversion effect is provided
Rate is higher, and voltage ripple is small, and stability and reliability are preferable, it is easy to accomplish the bipolarity buck direct current of miniaturization and lightweight
Converter.
In order to solve the above-mentioned technical problem, present invention employs the following technical solutions：
A kind of bipolarity buck-boost direct current converter, which is characterized in that the anode lifting pressing mold including common ground connection setting
Block and cathode lift die block, and the anode lifting die block includes that the anode being connected in turn between power input and ground is opened
Powered-down source unit, positive filter unit and positive load resistance R1；The positive switch power supply unit includes switching tube Q1, institute
The poles D for stating switching tube Q1 are connected to power input, and the inductance L1 being arranged in parallel and capacitance C1, institute are connected between the poles S and ground
It states and is in series with switching tube Q2 on capacitance C1, the poles D of the switching tube Q2 are connected with the capacitance C1, and the poles S are connected to the ground；It is described just
Pole filter unit includes the inductance L2 being arranged in series with the anode load resistance R1, and simultaneously with the positive load resistance R1
Join the capacitance C2 of setting, the other end of the inductance L2 is connected to the poles D of the switching tube Q2；
Cathode lifting die block include the negative switch power supply unit being connected in turn between power input and ground,
Cathode filter unit and cathode load resistance R2；The negative switch power supply unit includes the electricity being connected on power input
Feel L4, the poles the D connection of the switching tube Q3 being arranged in parallel and capacitance C4, the switching tube Q3 are connected between the inductance L4 and ground
To the inductance L4, the poles S ground connection；The poles the D ground connection of switching tube Q4, the switching tube Q4, the connection of the poles S are in series on the capacitance C4
To the capacitance C4；The cathode filter unit includes the inductance L3 being arranged in series with the cathode load resistance R2, the electricity
The other end of sense L3 is connected to the poles S of the switching tube Q4；The cathode filter unit further includes and the cathode load resistance
The capacitance C3 that R2 is arranged in parallel.
Using the above structure, in use, die block is lifted for anode, in the situation that the electric current of inductance L1 and L2 are all continuous
Under, circuit undergoes two on off states in succession in one cycle, and first on off state is switching tube Q1 conductings, switching tube Q2
Cut-off, power input is by switching tube Q1 to inductance L1 energy storage at this time, and in thermal energy storage process, the electric current of inductance L1 and inductance L2 are equal
Increase.Second on off state is switching tube Q1 cut-offs, and switching tube Q2 conductings, inductance L1 is through switching tube Q2 and capacitance C1 structures at this time
At oscillation circuit, the energy transfer of storage is to capacitance C1, up to the energy on the current over-zero of oscillation circuit, inductance L1 is whole
After being transferred on capacitance C1, conversion repeats above-mentioned thermal energy storage process to first on off state, meanwhile, capacitance C1 through inductance L2 to
Load supplying generates output voltage at the both ends of positive load resistance.
And die block is lifted for cathode, and end in switching tube Q3, under first on off state of switching tube Q4 conductings, electricity
One end level V1 for holding C4 connection inductance L4 has been charged to Vp, and the switching tube Q4 clampers that the level V2 of the other end is switched on arrive
Ground potential.And under second on off state that switching tube Q3 and switching tube Q4 are both turned on, one end of capacitance C4 connection inductance L4
Because the switching tube Q3 of conducting is connected to ground so that the level V1 at the end drastically drops to zero.Since capacitance voltage cannot be mutated, make
The current potential V2 for obtaining the capacitance C4 other ends also drastically declines equal amplitude, and then makes the electric current linear rise on inductance L4, energy storage
Increase.And capacitance C4 serves as accumulator, and electric current connects one end of inductance L4 from it and triggers, and flows through switching tube Q3 and cathode load
Resistance R2, then return to by inductance L3 the other end of C4.The energy being stored on capacitance C4 and inductance L3 has just passed to cathode
Load resistance R2, while by output filter capacitor reverse charging to-V (i.e. relatively be negative potential).Then it converts to switching tube
Q3 ends, and first on off state of switching tube Q4 conductings, one end level V1 of capacitance C4 connection inductance L4 rises to positive voltage
The level V2 of Vp, the capacitance C4 other ends rise therewith, but as described above, it can only reach switching tube Q4 clampers switched on
Zero potential.One end of the poles S of inductance L3 connecting valves pipe Q4 is ground potential at this time, and the other end is-V0(i.e. negative potential), inductance L3
On electric current just flow through switching tube Q4 and cathode load resistance R2 from one end of the poles S of inductance L3 connecting valve pipes Q4 after return to L3
The other end.This way it is possible to realize bipolarity is powered.And by positive filter unit and cathode filter unit respectively to just
Pole switching power supply and negative switch power supply unit are filtered so that the ripple voltage of output is small, stability and reliability
Preferably.
Further, the anode lifting die block further includes single for controlling the first driving of the switching tube Q1 break-makes
Member, first driving unit includes triode Q5 and triode Q6, the triode Q5 are NPN type triode, three pole
Pipe Q6 is PNP type triode；The collector of the triode Q5 is connected to power input, the emitter of the triode Q5 with
The emitter of the triode Q6 is connected, and the base stage of the triode Q5 and triode Q6 is respectively connected with PWM H+ pulsewidth tune
Signal processed；The collector of the triode Q6 is extremely connected with the S of the switching tube Q1；The poles G of the switching tube Q1 pass through resistance
R4 is connected to the emitter of the emitter and the triode Q6 of the triode Q5；Between the poles G and the poles S of the switching tube Q1
It is connected with resistance R3.
Further, first driving unit further includes the collector for being connected to the triode Q5 and the triode Q6
Collector between capacitance C5；It is in series with diode D1 and resistance between the collector and power input of the triode Q5
The anode of R5, the diode D1 are connected to the power input.
Further, the anode lifting die block further includes single for controlling the second driving of the switching tube Q2 break-makes
Member, second driving unit includes triode Q7 and triode Q8, the triode Q7 are NPN type triode, three pole
Pipe Q8 is PNP type triode；The collector of the triode Q7 is connected to power input, the emitter of the triode Q7 with
The emitter of the triode Q8 is connected, and the base stage of the triode Q7 and triode Q8 is respectively connected with PWM L+ pulsewidth tune
Signal processed, the grounded collector of the triode Q8；The poles G of the switching tube Q2 are connected to the triode Q7 by resistance R6
Emitter and the triode Q8 emitter；It is connected with resistance R7 between the poles G and the poles S of the switching tube Q2.
Further, the cathode lifting die block further includes driving list for controlling the third of the switching tube Q4 break-makes
Member, the third driving unit includes triode Q9 and triode Q10, the triode Q9 are NPN type triode, three pole
Pipe Q10 is PNP type triode；The collector of the triode Q9 is connected to power input, the emitter of the triode Q9
It is connected with the emitter of the triode Q10, the base stage of the triode Q9 and triode Q10 is respectively connected with PWM H- arteries and veins
Wide modulated signal；The collector of the triode Q10 is extremely connected with the S of the switching tube Q4；The poles G of the switching tube Q4 pass through
Resistance R9 is connected to the emitter of the emitter and the triode Q10 of the triode Q9；The poles G of the switching tube Q4 and S
Resistance R10 is connected between pole.
Further, the third driving unit further includes the collector for being connected to the triode Q9 and the triode
Capacitance C6 between the collector of Q10；Be in series between the collector and power input of the triode Q9 diode D2 and
Resistance R8, the anode of the diode D2 are connected to the power input.
Further, the cathode lifting die block further includes single for controlling the 4th driving of the switching tube Q3 break-makes
Member, the 4th driving unit include triode Q11 and triode Q12, and the triode Q12 is NPN type triode, and described three
Pole pipe Q11 is PNP type triode；The collector of the triode Q12 is connected to power input, the hair of the triode Q12
Emitter-base bandgap grading is connected with the emitter of the triode Q11, and the base stage of the triode Q12 and triode Q11 is respectively connected with PWM
L- pulse-width signals, the grounded collector of the triode Q11；The poles G of the switching tube Q3 are connected to institute by resistance R11
State the emitter of the emitter and the triode Q11 of triode Q12；It is connected with electricity between the poles G and the poles S of the switching tube Q3
Hinder R12.
Further, the PWM H+ pulse-width signals and PWM L+ pulse-width signals are that one group of complementation pulsewidth modulation is believed
Number.
Further, the PWM H- pulse-width signals and PWM L- pulse-width signals are that one group of complementation pulsewidth modulation is believed
Number.
In conclusion the present invention has transfer efficiency higher, voltage ripple is small, and stability and reliability are preferable, is easy to real
The advantages that existing miniaturization and lightweight.
Description of the drawings
Fig. 1 is the structural schematic diagram of the embodiment of the present invention.
Fig. 2 is a kind of summing circuit schematic diagram powered using bipolarity buck-boost direct current converter.
Fig. 3 is a kind of source electrode coupled differential formula amplifying circuit signal using the power supply of bipolarity buck-boost direct current converter
Figure.
Specific implementation mode
With reference to embodiment, the present invention is described in further detail.
When specific implementation：As shown in Figure 1, a kind of bipolarity buck-boost direct current converter, including common ground connection setting is just
Pole lifts die block and cathode lifts die block, and the anode lifting die block includes being connected to power input and ground in turn
Between positive switch power supply unit, positive filter unit and positive load resistance R1；The positive switch power supply unit includes
The poles D of switching tube Q1, the switching tube Q1 are connected to power input, and the inductance L1 being arranged in parallel is connected between the poles S and ground
With capacitance C1, switching tube Q2 is in series on the capacitance C1, and the poles D of the switching tube Q2 are connected with the capacitance C1, the poles S and ground
It is connected；It is described anode filter unit include the inductance L2 being arranged in series with the anode load resistance R1, and with the anode
The capacitance C2 that load resistance R1 is arranged in parallel, the other end of the inductance L2 are connected to the poles D of the switching tube Q2；
Cathode lifting die block include the negative switch power supply unit being connected in turn between power input and ground,
Cathode filter unit and cathode load resistance R2；The negative switch power supply unit includes the electricity being connected on power input
Feel L4, the poles the D connection of the switching tube Q3 being arranged in parallel and capacitance C4, the switching tube Q3 are connected between the inductance L4 and ground
To the inductance L4, the poles S ground connection；The poles the D ground connection of switching tube Q4, the switching tube Q4, the connection of the poles S are in series on the capacitance C4
To the capacitance C4；The cathode filter unit includes the inductance L3 being arranged in series with the cathode load resistance R2, the electricity
The other end of sense L3 is connected to the poles S of the switching tube Q4；The cathode filter unit further includes and the cathode load resistance
The capacitance C3 that R2 is arranged in parallel.
The anode lifting die block further includes the first driving unit for controlling the switching tube Q1 break-makes, and described the
One driving unit includes triode Q5 and triode Q6, the triode Q5 are NPN type triode, and the triode Q6 is PNP
Type triode；The collector of the triode Q5 is connected to power input, the emitter of the triode Q5 and three pole
The emitter of pipe Q6 is connected, and the base stage of the triode Q5 and triode Q6 is respectively connected with PWM H+ pulse-width signals；
The collector of the triode Q6 is extremely connected with the S of the switching tube Q1；The poles G of the switching tube Q1 are connected to by resistance R4
The emitter of the emitter of the triode Q5 and the triode Q6；It is connected with electricity between the poles G and the poles S of the switching tube Q1
Hinder R3.
First driving unit further includes the current collection of the collector and the triode Q6 that are connected to the triode Q5
Capacitance C5 between pole；Diode D1 and resistance R5, institute are in series between the collector and power input of the triode Q5
The anode for stating diode D1 is connected to the power input.
The anode lifting die block further includes the second driving unit for controlling the switching tube Q2 break-makes, and described the
Two driving units include triode Q7 and triode Q8, the triode Q7 are NPN type triode, and the triode Q8 is PNP
Type triode；The collector of the triode Q7 is connected to power input, the emitter of the triode Q7 and three pole
The emitter of pipe Q8 is connected, and the base stage of the triode Q7 and triode Q8 is respectively connected with PWM L+ pulse-width signals,
The grounded collector of the triode Q8；The poles G of the switching tube Q2 are connected to the transmitting of the triode Q7 by resistance R6
The emitter of pole and the triode Q8；It is connected with resistance R7 between the poles G and the poles S of the switching tube Q2.
Cathode lifting die block further includes the third driving unit for controlling the switching tube Q4 break-makes, and described the
Three driving units include triode Q9 and triode Q10, the triode Q9 are NPN type triode, and the triode Q10 is
PNP type triode；The collector of the triode Q9 is connected to power input, the emitter of the triode Q9 and described three
The emitter of pole pipe Q10 is connected, and the base stage of the triode Q9 and triode Q10 is respectively connected with PWM H- pulsewidth modulations letter
Number；The collector of the triode Q10 is extremely connected with the S of the switching tube Q4；The poles G of the switching tube Q4 are connected by resistance R9
It is connected to the emitter of the emitter and the triode Q10 of the triode Q9；Connect between the poles G and the poles S of the switching tube Q4
It is connected to resistance R10.
The third driving unit further includes the current collection of the collector and the triode Q10 that are connected to the triode Q9
Capacitance C6 between pole；Diode D2 and resistance R8, institute are in series between the collector and power input of the triode Q9
The anode for stating diode D2 is connected to the power input.
Cathode lifting die block further includes the 4th driving unit for controlling the switching tube Q3 break-makes, and described the
Four driving units include triode Q11 and triode Q12, the triode Q12 are NPN type triode, and the triode Q11 is
PNP type triode；The collector of the triode Q12 is connected to power input, the emitter of the triode Q12 with it is described
The emitter of triode Q11 is connected, and the base stage of the triode Q12 and triode Q11 is respectively connected with PWM L- pulsewidth tune
Signal processed, the grounded collector of the triode Q11；The poles G of the switching tube Q3 are connected to the triode by resistance R11
The emitter of the emitter of Q12 and the triode Q11；It is connected with resistance R12 between the poles G and the poles S of the switching tube Q3.
The PWM H+ pulse-width signals and PWM L+ pulse-width signals are one group of complementation pulse-width signal.
The PWM H- pulse-width signals and PWM L- pulse-width signals are one group of complementation pulse-width signal.
Using the above structure, in use, lifting die block for anode, which passes through in succession in one cycle in circuit
Go through two on off states.When PWM H+ are high level, PWM L+ are low level, and triode Q5 is connected at this time, the grid source of mos pipes Q1
Voltage is bootstrap capacitor C5 both end voltages, and mos pipes Q1 is connected, while triode Q8 is also switched on, and the gate source voltage of mos pipes Q2 is
The Q2 cut-offs of zero, mos pipe, this state are on off state 1, and for power supply through mos pipes Q1 to inductance L1 energy storage, capacitance C1 passes through mos pipes Q1
It to inductance L2 energy storage and powers to the load, inductance L1 and inductance L2 electric currents increase.When PWM H+ are low level, PWM L+ are height
Level, triode Q6 conductings at this time, mos pipe Q1 gate source voltages are the Q1 cut-offs of zero, mos pipes, while triode Q7 is also switched on, mos
Pipe Q2 gate source voltages are VCC voltages, and mos pipes Q2 conducting, this state is on off state 2, at this time power supply VCC by diode D1 and
Resistance R5 charges to bootstrap capacitor C5, and inductance L1 constitutes oscillation circuit through mos pipes Q2 and capacitance C1, and the energy transfer of storage is extremely
Capacitance C1, inductance L2 release energy, power to the load.In on off state 1, the voltage of inductance L1 and inductance L2 are respectively：
UL1=Ui
UL2=Ui+UC1—Uo
In on off state 2, the voltage of inductance L1 and inductance L2 are respectively：
UL1=-UC1
UL2=-Uo
By the voltage-second balance of inductance：
UiDT+(—UC1) (1-D) T=0
(Ui+UC1—Uo)DT+(—Uo) (1-D) T=0
The input voltage of anode lifting die block and the expression formula of output voltage are as follows：
In above formula, UoFor input voltage, UiFor output voltage, UC1For capacitance C1 both end voltages, D is PWM H+ duty ratios, T
For the period of PWM H+.
And die block is lifted for cathode, which undergoes two on off states in succession in one cycle in circuit.When
PWM L- are high level, and PWM H- are low level, and triode Q12 is connected at this time, and mos pipe Q3 gate source voltages are VCC voltages, mos
Pipe Q3 conductings, while triode Q10 conductings, mos pipe Q4 gate source voltages are the Q4 cut-offs of zero, mos pipes, this state is on off state 3,
Power supply VCC charges to inductance L4, and the energy transfer of capacitance C4 storages powers to the load to inductance L3.When PWMH- is high electricity
Flat, PWM L- are low level, and triode Q9 is connected at this time, and mos pipe Q4 gate source voltages are bootstrap capacitor C6 both end voltages, mos pipes
Q4 is connected, while triode Q11 conductings, and mos pipe Q3 gate source voltages are the Q3 cut-offs of zero, mos pipes, are on off state 4, at this point, electric
Feel L4 and capacitance C4 and oscillation circuit is constituted by mos pipes Q4, the energy transfer that inductance L4 is stored to capacitance C4, inductance L3 passes through
Mos pipes Q4 releases energy, and powers to the load.
In on off state 3, the voltage of inductance L4 and inductance L3 are respectively：
UL4=Ui
UL3=UC4+Uo
It is respectively in the voltage of the inductance L4 and inductance L3 of on off state 4：
UL4=Ui—UC4
UL3=Uo
By the voltage-second balance of inductance：
UiDT+(Ui—UC4) (1-D) T=0
(UC4+Uo)DT+Uo(1-D) T=0
The input voltage of cathode lifting die block and the expression formula of output voltage are as follows：
In above formula, UoFor input voltage, UiFor output voltage, UC4For capacitance C4 both end voltages, D is the duty of PWM L-
Than T is the period of PWM L-.
In the present embodiment, power input terminal voltage is 6.5V, and inductance L1, L2, L3 and L4 are 100uH, capacitance C1,
C2, C3 and C4 are 10uF, and the resistance value of positive load resistance R1 and cathode load resistance R2 are 100 Europe.
Operational amplifier is to need to power in negative and positive dual power, can build summing circuit using operational amplifier, ask poor
Circuit, differential circuit and integrating circuit etc..If Fig. 2 is a typical summing circuit, OUT+ and OUT- is respectively connected in figure
The power output end of the anode lifting die block and cathode lifting die block of bipolarity buck-boost direct current converter.It is transported using ideal
The characteristic put has empty short vp-vn=0, ii=0 and virtual earth vnFollowing equation can be written to reversed input node in=0 concept：
It can thus be concluded that：
Work as R18=R19=R20, then becomes：
-vo=vi1+vi2
If accessing level-one negative circuit again in output end, negative sign can be eliminated, realization complies fully with conventional arithmetic and adds
Method.
If Fig. 3 is a source electrode coupled differential formula amplifying circuit, OUT+ and OUT- is respectively connected to bipolarity lifting in figure
The power output end of the anode lifting die block and cathode lifting die block of straightening current converter.When input signal is zero, i.e.,
vi1=vi2=0, since circuit is full symmetric, RC1=RC2=RC, VBE1=VBE2=0.7V, at this moment iC1=iC2=IC, RC1IC1=
RC2IC2, VCE1=VCE2=VOUT+-ICRC+ 0.7V, VC1=VC2=VOUT+-RCIC, vo=vo1-vo2=0.Therefore, input signal electricity
When pressure is zero, output signal voltage is also zero.
When two input terminals of circuit respectively add an equal in magnitude, opposite polarity voltage signal, i.e. vi1=-vi2, one
Tube current increases, and another tube current then reduces, so differential mode output signal voltage vod=vo1-vo2≠ 0, i.e. output end has output
Signal voltage.
When common-mode signal is added in two input terminals, i.e. vi1=vi2=vic, the collector current of two pipes and corresponding current collection
Pole tension changes identical, i.e. vocl=voc2, vo=vocl-voc2=0.
As difference mode signal vidWith common-mode signal vicWhen inputting simultaneously, both-end output voltage is the superposition of both the above situation,
That is vo=vo1-vo2=vOd,It can be seen that it is full symmetric ideally, the difference mode signal that circuit only amplifies, and inhibit common mode
Signal.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not limitation, all essences in the present invention with the present invention
All any modification, equivalent and improvement etc., should all be included in the protection scope of the present invention made by within refreshing and principle.
Claims (9)
1. a kind of bipolarity buck-boost direct current converter, which is characterized in that the anode lifting die block including common ground connection setting
Die block is lifted with cathode, the anode lifting die block includes the positive switch being connected in turn between power input and ground
Power supply unit, positive filter unit and positive load resistance R1；The positive switch power supply unit includes switching tube Q1, described
The poles D of switching tube Q1 are connected to power input, and the inductance L1 being arranged in parallel and capacitance C1 is connected between the poles S and ground, described
Switching tube Q2 is in series on capacitance C1, the poles D of the switching tube Q2 are connected with the capacitance C1, and the poles S are connected to the ground；The anode
Filter unit includes the inductance L2 being arranged in series with the anode load resistance R1, and in parallel with the anode load resistance R1
The capacitance C2 of setting, the other end of the inductance L2 are connected to the poles D of the switching tube Q2；
The cathode lifting die block includes negative switch power supply unit, the cathode being connected in turn between power input and ground
Filter unit and cathode load resistance R2；The negative switch power supply unit includes the inductance being connected on power input
L4, is connected with the switching tube Q3 being arranged in parallel and capacitance C4 between the inductance L4 and ground, the poles D of the switching tube Q3 are connected to
The inductance L4, the poles S ground connection；The poles the D ground connection of switching tube Q4, the switching tube Q4 are in series on the capacitance C4, the poles S connect
It is connected to the capacitance C4；The cathode filter unit includes the inductance L3 being arranged in series with the cathode load resistance R2, described
The other end of the inductance L3 be connected to the poles S of the switching tube Q4；The cathode filter unit further includes and the cathode
The capacitance C3 that load resistance R2 is arranged in parallel.
2. bipolarity buck-boost direct current converter as described in claim 1, which is characterized in that the anode lifting die block is also
Include the first driving unit for controlling the switching tube Q1 break-makes, first driving unit includes triode Q5 and three poles
Pipe Q6, the triode Q5 are NPN type triode, and the triode Q6 is PNP type triode；The collector of the triode Q5
It is connected to power input, the emitter of the triode Q5 is connected with the emitter of the triode Q6, the triode Q5
It is respectively connected with PWM H+ pulse-width signals with the base stage of the triode Q6；The collector of the triode Q6 and the switch
The S of pipe Q1 is extremely connected；The poles G of the switching tube Q1 are connected to the emitter of the triode Q5 and three pole by resistance R4
The emitter of pipe Q6；It is connected with resistance R3 between the poles G and the poles S of the switching tube Q1.
3. bipolarity buck-boost direct current converter as claimed in claim 2, which is characterized in that first driving unit also wraps
Include the capacitance C5 between the collector for being connected to the triode Q5 and the collector of the triode Q6；The triode Q5's
Diode D1 and resistance R5 are in series between collector and power input, the anode of the diode D1 is connected to the power supply
Input terminal.
4. bipolarity buck-boost direct current converter as claimed in claim 2, which is characterized in that the anode lifting die block is also
Include the second driving unit for controlling the switching tube Q2 break-makes, second driving unit includes triode Q7 and three poles
Pipe Q8, the triode Q7 are NPN type triode, and the triode Q8 is PNP type triode；The collector of the triode Q7
It is connected to power input, the emitter of the triode Q7 is connected with the emitter of the triode Q8, the triode Q7
It is respectively connected with PWM L+ pulse-width signals, the grounded collector of the triode Q8 with the base stage of the triode Q8；It is described
The poles G of switching tube Q2 are connected to the emitter of the emitter and the triode Q8 of the triode Q7 by resistance R6；It is described
It is connected with resistance R7 between the poles G and the poles S of switching tube Q2.
5. bipolarity buck-boost direct current converter as described in claim 1, which is characterized in that the cathode lifting die block is also
Include the third driving unit for controlling the switching tube Q4 break-makes, the third driving unit includes triode Q9 and three poles
Pipe Q10, the triode Q9 are NPN type triode, and the triode Q10 is PNP type triode；The current collection of the triode Q9
Pole is connected to power input, and the emitter of the triode Q9 is connected with the emitter of the triode Q10, the triode
The base stage of the Q9 and triode Q10 is respectively connected with PWM H- pulse-width signals；The collector of the triode Q10 with it is described
The S of switching tube Q4 is extremely connected；The poles G of the switching tube Q4 are connected to the emitter of the triode Q9 and described by resistance R9
The emitter of triode Q10；It is connected with resistance R10 between the poles G and the poles S of the switching tube Q4.
6. bipolarity buck-boost direct current converter as claimed in claim 5, which is characterized in that the third driving unit also wraps
Include the capacitance C6 between the collector for being connected to the triode Q9 and the collector of the triode Q10；The triode Q9
Collector and power input between be in series with diode D2 and resistance R8, the anode of the diode D2 is connected to the electricity
Source input terminal.
7. bipolarity buck-boost direct current converter as claimed in claim 5, which is characterized in that the cathode lifting die block is also
Include the 4th driving unit for controlling the switching tube Q3 break-makes, the 4th driving unit includes triode Q11 and three
Pole pipe Q12, the triode Q12 are NPN type triode, and the triode Q11 is PNP type triode；The triode Q12's
Collector is connected to power input, and the emitter of the triode Q12 is connected with the emitter of the triode Q11, described
The base stage of the triode Q12 and triode Q11 is respectively connected with PWM L- pulse-width signals, the current collection of the triode Q11
Pole is grounded；The poles G of the switching tube Q3 are connected to the emitter of the triode Q12 and the triode Q11 by resistance R11
Emitter；It is connected with resistance R12 between the poles G and the poles S of the switching tube Q3.
8. bipolarity buck-boost direct current converter as claimed in claim 4, which is characterized in that the PWM H+ pulsewidth modulations letter
Number and PWM L+ pulse-width signals be one group of complementation pulse-width signal.
9. bipolarity buck-boost direct current converter as claimed in claim 7, which is characterized in that the PWM H- pulsewidth modulations letter
Number and PWM L- pulse-width signals be one group of complementation pulse-width signal.
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| CN201810438070.3A CN108599554A (en) | 2018-05-09 | 2018-05-09 | A kind of bipolarity buck-boost direct current converter |
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| CN201810438070.3A CN108599554A (en) | 2018-05-09 | 2018-05-09 | A kind of bipolarity buck-boost direct current converter |
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