CN106253673A - A kind of DC voltage changer - Google Patents
A kind of DC voltage changer Download PDFInfo
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- CN106253673A CN106253673A CN201610921730.4A CN201610921730A CN106253673A CN 106253673 A CN106253673 A CN 106253673A CN 201610921730 A CN201610921730 A CN 201610921730A CN 106253673 A CN106253673 A CN 106253673A
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- voltage
- outfan
- branch road
- rectification branch
- feedback
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- 239000000411 inducer Substances 0.000 claims abstract description 14
- 230000005611 electricity Effects 0.000 claims description 14
- 230000005669 field effect Effects 0.000 claims description 14
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- 238000004146 energy storage Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 230000000087 stabilizing effect Effects 0.000 description 5
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- 101100140580 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) REF2 gene Proteins 0.000 description 3
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- 101000806846 Homo sapiens DNA-(apurinic or apyrimidinic site) endonuclease Proteins 0.000 description 2
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- 238000009825 accumulation Methods 0.000 description 1
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- 230000001276 controlling effect Effects 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
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Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
Abstract
The open a kind of DC voltage changer of the embodiment of the present invention, including: inducer, switching device, the first Voltage Feedback control circuit, the first rectification branch road, at least one the second rectification branch roads and at least one the second feedback control circuits；First Voltage Feedback control circuit, for obtaining the first rectification branch road outfan to the first the first outfan output voltage loaded as the first feedback voltage, controls the first switch terminals and the on or off of second switch end of switching device according to the first feedback voltage；Second feedback control circuit, for obtaining the second corresponding rectification branch road outfan to the second the second outfan output voltage loaded as the second feedback voltage, controls the resistance of the controlled resistor circuit of the second rectification branch road according to the second feedback voltage.The embodiment of the present invention, is provided with independent Voltage Feedback control circuit to the outfan of each rectification branch road, thus ensures the constant voltage performance of the outfan of each rectification branch road.
Description
Technical field
The present invention relates to electric correlative technology field, particularly a kind of D. C-D. C voltage converter.
Background technology
Current a large amount of electronics, electrical equipment and product employing battery are as power supply, but the output voltage of battery is non-constant
And voltage is relatively low.Therefore boosting voltage stabilizing technique arises at the historic moment the most in a large number.But existing booster circuit output feedback
Can only follow the tracks of a road output, when there is output multi load, between load, noise crosstalk interference is serious, output ripple big suppression difficulty；Cannot be real
Now the independent noise of each output loading is controlled；When multiple different loads voltage literary composition ripple requires, need multiple completely isolated straight
Stream boosting unit, causes repetition and the waste of element cost of circuit design.
As it is shown in figure 1, illustrate the DC boosting DC-DC voltage changer of a kind of boost topological structure.Its function is
Relatively low direct voltage source is transformed to the DC source that output voltage is higher；Meanwhile, output loading electricity in specified scope is ensured
During rheology, output voltage is default steady state value.L' is energy storage inductor, and Vin' is direct voltage source.When it normally works,
When switching tube Q' opens (when turning on over the ground), and inductive current flows back to the negative pole of Vin' power supply by switching tube Q' and earth-return.This
Time, L' coil inside have accumulated certain energy.When Q' turns off, the energy in L' is discharged into negative by commutation diode D1'
Carry 12.Now complete the switch in a cycle.When switching tube Q' with some fixed switching frequency and dutycycle (ON time/
Switch periods) running hours, the power of input is transferred effectively to outfan, the filter capacitor of outfan simultaneously
Cout' passes through discharge and recharge voltage stabilizing, when load current is stablized, the pulse current that switch on and off produces is changed into steady voltage
Vout' exports electric current.And during this inductance L' discharges, create at inductance two ends and Vin' forward pressure in the same direction
Difference, therefore at the output end voltage of rectifier tube D' higher than the input voltage of Vin'.And work as Q' switching frequency and the setting of dutycycle,
Input and the output voltage that just can make above-mentioned booster converter reach a stable ratio, it is achieved the mesh of DC boosting conversion
's.
In order to realize constant voltage output, prior art adds a negative feedback control circuit 11 in above-mentioned DC-DC circuit, makes
The duty cycle of switching real-time change of Q', falls in order to compensate the output end voltage Vout' caused when load current increase, from
And produce constant voltage output effect.
But, inventor finds during realizing inventing, and in side circuit design application, a large amount of needs are isolated
Multi output end DC-DC voltage boosting converter, as in figure 2 it is shown, load 21 and load 22 carries are at two separate voltages
On outfan.The outfan of one public energy storage inductor L' connects the positive pole of D1' and D2' of commutation diode respectively.And D1'
Filter capacitor C1' and C2' and load 21 and 22 is each connected with the negative pole of D2'.Interference between load is pressed down by this double output ends
It is shaped with significant effect.But simultaneously as above-mentioned dual output voltage conversion circuit only one of which Voltage Feedback, therefore can only be to one
Output voltage carries out dynamic compensation, i.e. Vout1' has stable voltage to export；And due to the C-V characteristic of D1' commutation diode,
When loading 21 electric currents and fluctuation occurring, the tube voltage drop of D1' fluctuates the most simultaneously, causes going out of no-voltage regulating power to hold Vout2' to produce
Raw voltage pulsation, loses constant voltage performance.
Summary of the invention
Based on this, it is necessary to constant voltage performance cannot be realized between the multi load device for the same voltage source of prior art
Technical problem, it is provided that a kind of D. C-D. C voltage converter.
The embodiment of the present invention provides a kind of D. C-D. C voltage converter, including: inducer, switching device, the first voltage
Feedback control circuit, the first rectification branch road, at least one the second rectification branch roads and at least one the second feedback control circuits；
Described inducer one end for being connected with direct voltage source, the other end respectively with the input of described first rectification branch road
End, the first switch terminals of the input of described second rectification branch road and described switching device connect, the of described switching device
Two switch terminals ground connection, described first rectification branch road outfan is for the first load supplying, described second rectification branch road outfan
For to the second load supplying；
Described first Voltage Feedback control circuit, for obtaining described first rectification branch road outfan the to the first load
One outfan output voltage, as the first feedback voltage, controls the first of described switching device according to described first feedback voltage and opens
Guan Duan and the on or off of second switch end；
Every described second rectification branch road includes a controlled resistor connected with the outfan of described second rectification branch road
Circuit, and every described second rectification branch road is corresponding with second feedback control circuit；
Described second feedback control circuit, for obtaining the described second rectification branch road outfan of correspondence to the second load
Second outfan output voltage, as the second feedback voltage, controls described second rectification branch road according to described second feedback voltage
The resistance of controlled resistor circuit.
Further, described second feedback control circuit, specifically for:
Obtain the second outfan output voltage of corresponding described second rectification branch road outfan as the second feedback voltage,
Obtain the first outfan output voltage of described first rectification branch road outfan as the first feedback voltage；
Described first feedback voltage is compared with the second reference voltage preset and obtains bias voltage, by described second
Feedback voltage and described bias voltage compare and obtain the second voltage error signal, according to described second voltage error signal control
Make the resistance of the controlled resistor circuit of described second rectification branch road.
Further, described second feedback control circuit, including: the second error amplifier, the second biased amplifier and
Second reference voltage source, an input of described second biased amplifier is connected, separately with the outfan of described first rectification branch road
One input and the second reference voltage source connect, an input of described second error amplifier and corresponding described second rectification
The outfan of branch road connects, and another input is connected with the outfan of described second biased amplifier, and described second error is amplified
The outfan of device is connected as controlled end with described controlled resistor circuit described in the outfan of the second feedback control circuit.
Further, described second feedback control circuit, specifically for:
Obtain the second outfan output voltage of corresponding described second rectification branch road outfan as the second feedback voltage,
Described second feedback voltage is compared obtain tertiary voltage error signal with the second reference voltage preset, according to described the
Three voltage error signals control the resistance of the controlled resistor circuit of described second rectification branch road.
Further, described second feedback control circuit, including: the second error amplifier and the second reference voltage source,
One input of described second error amplifier is connected with the outfan of described second rectification branch road, another input and the second base
Reference voltage source connects, and the outfan of described second error amplifier is controlled with described as the outfan of the second feedback control circuit
The controlled end of resistance circuit connects.
Further, every described controlled resistor circuit includes controlled current source and field effect transistor, described controlled current source
The end that controls be connected with the outfan of described second feedback control circuit, one end of described controlled current source and described field effect transistor
Grid connect, other end ground connection, the source electrode of described field effect transistor and drain electrode connect with the outfan of described second rectification branch road.
Further, one end of described controlled current source bridges controlled current flow with the outfan of described second rectification branch road
Source divider resistance.
Further:
Described first rectification branch road also includes and described first load the first bleeder circuit in parallel, described acquisition described the
First the first outfan output voltage loaded as the first feedback voltage, is specifically included by one rectification branch road outfan:
Obtain the described first outfan output voltage the first outfan branch pressure voltage after the first bleeder circuit dividing potential drop
As the first feedback voltage；
Described second rectification branch road also includes second bleeder circuit in parallel with described second load, and described acquisition is corresponding
Second the second outfan output voltage loaded as the second feedback voltage, is specifically wrapped by described second rectification branch road outfan
Include:
Obtain the corresponding described second rectification branch road outfan the second outfan after the second bleeder circuit dividing potential drop to divide
Piezoelectricity pressure is as described second feedback voltage.
Further, described first Voltage Feedback control circuit, specifically for:
Obtain the described first rectification branch road outfan the first outfan output voltage to the first load as the first feedback
Voltage, compares described first feedback voltage with the first reference voltage preset and obtains the first voltage error signal, to institute
State the first voltage error signal to be modulated, obtain being controlled by the pulse-width signal of described first voltage error signal, by institute
State pulse-width control signal to be converted to drive signal, use described driving signal to control first switch terminals and the of described switching device
The on or off of two switch terminals.
Further, described first Voltage Feedback control circuit, including: the first error amplifier, the first reference voltage
Source, pulse width modulator, sawtooth generator and switching signal drive circuit, an input of described first error amplifier and institute
The outfan stating the first rectification branch road connects, and another input and the first reference voltage source connect, the one of described pulse width modulator
Input is connected with the outfan of described first error amplifier, and another input connects with the outfan of described sawtooth generator
Connecing, the outfan of described pulse width modulator is connected with the input of described switching signal drive circuit, and described switching signal drives
The outfan of circuit is connected with the controlled end of described switching device as the outfan of the first feedback control circuit.
The embodiment of the present invention, is provided with independent Voltage Feedback control circuit to the outfan of each rectification branch road,
Thus ensure the constant voltage performance of the outfan of each rectification branch road.Emphasis solves multiple problems of prior art.First, it is achieved
The tracking voltage stabilizing output of two-way or multichannel, output channel is separate, noise crosstalk interference between isolation load.Second, each output is logical
Road ripple control excellent effect.3rd, it is achieved the feedback control that multiple-channel output voltage is independent or relevant, Power Management Design motility is non-
Chang great.4th, the design of single supply input stage many power supplys output stage, greatly reduce cost, and reduce circuit space.This
Invention application circuit is simple, i.e. can apply to IC design and can be used for separating element circuit design.
Accompanying drawing explanation
Fig. 1 is the electricity of the DC boosting DC-DC voltage changer of a kind of single outfan boost topological structure of prior art
Road schematic diagram；
Fig. 2 is the electricity of the DC boosting DC-DC voltage changer of a kind of double output ends boost topological structure of prior art
Road schematic diagram；
The circuit theory diagrams of a kind of D. C-D. C voltage converter that Fig. 3 provides for one embodiment of the invention；
The circuit theory diagrams of a kind of D. C-D. C voltage converter that Fig. 4 provides for another alternative embodiment of the present invention；
The operation principle sequential chart of a kind of D. C-D. C voltage converter that Fig. 5 provides for one embodiment of the invention.
Detailed description of the invention
The present invention will be further described in detail with specific embodiment below in conjunction with the accompanying drawings.
Embodiment one
It is illustrated in figure 3 the circuit theory diagrams of a kind of D. C-D. C voltage converter that one embodiment of the invention provides, bag
Include: inducer L, switching device Q1, first Voltage Feedback control circuit the 33, first rectification branch road 31, at least one the second rectifications
Branch road 32 and at least one the second feedback control circuits 34；
Described inducer L one end for being connected with direct voltage source Vin, the other end respectively with described first rectification branch road 31
Input, the input of described second rectification branch road 32 and described switching device Q1 first switch terminals Q11 connect, institute
Stating the second switch end Q12 ground connection of switching device Q1, described first rectification branch road 31 outfan is powered for loading 35 to first,
Described second rectification branch road 32 outfan is for the second load 36 power supply；
Described first Voltage Feedback control circuit 33, is used for obtaining described first rectification branch road 31 outfan to the first load
The first outfan output voltage Vout1 of 35, as the first feedback voltage, controls described switch according to described first feedback voltage
First switch terminals Q11 of device Q1 and the on or off of second switch end Q12；
Every described second rectification branch road 32 includes a controlled electricity connected with the outfan of described second rectification branch road
Resistance circuit 321, and every described second rectification branch road 3 is corresponding with second feedback control circuit 34；
Described second feedback control circuit 34, negative to second for obtaining described second rectification branch road 32 outfan of correspondence
Carry the second outfan output voltage Vout2 of 36 as the second feedback voltage, control described the according to described second feedback voltage
The resistance of the controlled resistor circuit 321 of two rectification branch roads 32.
Specifically, as it is shown on figure 3, the first rectification branch road 31 includes that the first rectifying device D1, the second rectification branch road 32 include
Second rectifying device D2.Inducer L1 is energy storage inductor, and its input is connected with voltage source Vin.Voltage source Vin is whole circuit
Power source.Switching device Q1 is chosen as nmos pass transistor and constitutes, and when it turns on, inductive current is flowed to by switching device Q1
Earth-return, now inducer L1 coil inside have accumulated energy.When switching device Q1 turns off, inducer L1 accumulation energy is at it
Internal generation electromotive force, inductive current discharges under its effect and flows to the first load 35 and the second load 36 respectively.With this electricity
The power of potential source Vin has been passed in the first load 35 and the second load 36.
Meanwhile, be connected with the outfan of the first rectification branch road 31 for the first feedback control circuit 33, and with the second rectification
What the outfan of branch road 32 connected is 34 for the second feedback control circuit.Can there be a second rectification branch road 32 or parallel connection
A plurality of second rectification branch road 32, every second rectification branch road 32 is all 34 to be connected with second feedback control circuit.Wherein, figure
In 3 as a example by a second rectification branch road 32.
The outfan of the first rectification branch road 31 is electric as the first feedback to the first output voltage Vout1 of the first load 35
Pressure, through the first voltage feedback circuit 33, is converted to fixed cycle switch and the control signal of variable duty ratio, in order to control
First switch terminals of switching device Q1 and the turn-on and turn-off of second switch end.Thus realize at power supply Vin, energy storage inductor L and
The pre-set constant voltage output of the first output voltage Vout1 of this passage of the first rectification branch road 31 series connection.Defeated for second
Go out to hold output voltage Vout2, then use the controlled resistor circuit 321 of adjustable internal resistance to be serially connected in output channel.
Second feedback control circuit 34 obtains described second rectification branch road 32 outfan of correspondence the to the second load 36
Two outfan output voltage Vout2, as the second feedback voltage, prop up for controlling described second rectification according to the second feedback voltage
The resistance of the controlled resistor circuit 321 on road 32.Therefore, the output circuit of the second rectification branch road 32 is flowing through controlled resistor circuit
The pressure drop produced when 321, can effectively realize output second loading the voltage stabilizing of the second outfan output voltage Vout2 of 36 certainly
Dynamic control.
The embodiment of the present invention, is provided with independent Voltage Feedback control circuit to the outfan of each rectification branch road,
Thus ensure the constant voltage performance of the outfan of each rectification branch road.
Embodiment two
A kind of D. C-D. C voltage converter that alternative embodiment of the present invention provides, including: inducer L, switching device
Q1, first Voltage Feedback control circuit the 33, first rectification branch road 31, at least one the second rectification branch roads 32 and at least one the
Two feedback control circuits 34.
Described inducer L one end for being connected with direct voltage source Vin, the other end respectively with described first rectification branch road 31
Input, the input of described second rectification branch road 32 and described switching device Q1 first switch terminals Q11 connect, institute
Stating the second switch end Q12 ground connection of switching device Q1, described first rectification branch road 31 outfan is powered for loading 35 to first,
Described second rectification branch road 32 outfan is for the second load 36 power supply.
Described first rectification branch road 31 also includes and described first load 35 first bleeder circuits 37 in parallel, described first
Voltage Feedback control circuit 33, specifically for:
Obtain the described first outfan output voltage Vout1 the first outfan after the first bleeder circuit 37 dividing potential drop to divide
Described first feedback voltage, as the first feedback voltage, is compared by piezoelectricity pressure VFB1 with the first reference voltage REF1 preset
Obtain the first voltage error signal Err1, described first voltage error signal Err1 is modulated, obtain being controlled by described
The pulse-width signal PWM-CTL of one voltage error signal Err1, is converted to described pulse-width control signal PWM-CTL drive letter
Number, use described driving signal to control first switch terminals Q11 of described switching device Q1 and the conducting of second switch end Q12 or pass
Disconnected.
Specifically, described first Voltage Feedback control circuit 33, including: first error amplifier the 331, first reference voltage
Source 332, pulse width modulator 333, sawtooth generator 334 and switching signal drive circuit 335, described first error amplifier
One input of 331 is connected with the outfan of described first rectification branch road 31, and another input and the first reference voltage source 332 are even
Connecing, alternatively, an input of the first error amplifier 331 is connected with the dividing potential drop outfan of described first bleeder circuit, described
One input of pulse width modulator 333 is connected with the outfan of described first error amplifier 331, another input and described saw
The outfan of tooth wave producer 334 connects, the outfan of described pulse width modulator 333 and described switching signal drive circuit 335
Input connect, the outfan of described switching signal drive circuit 335 as the first feedback control circuit 33 outfan with
The controlled end Q13 of described switching device Q1 connects.
First bleeder circuit 37 includes the resistance R1 and resistance R2 of series connection, and the first outfan branch pressure voltage VFB1 is resistance R1
Voltage with the junction point of resistance R2.
First Voltage Feedback control circuit 33, by the duty cycle of switching real-time change to switching device Q1, is worked as in order to compensate
What the first outfan output voltage Vout1 that load current increase causes was occurred falls, thus produces constant voltage output effect.As
Sampling the first outfan output voltage Vout1 and dividing potential drop in Fig. 3, the first bleeder circuit 37 exports VFB and amplifies to error
Device 331, carries out the first voltage of differential amplification output by mistake at the first reference voltage REF1 with the first reference voltage source 332 output
Difference signal Err1.First voltage error signal Err1 output signal PWM-CTL after pulse width modulator 333 is modulated is through driving
Galvanic electricity road 335 realizes the break-make to switching device Q1 and controls.Said process achieves the first outfan output voltage Vout1 voltage
Dynamic constant-pressure compensation controls.
Every described second rectification branch road 32 includes a controlled electricity connected with the outfan of described second rectification branch road
Resistance circuit 321, and every described second rectification branch road 3 is corresponding with second feedback control circuit 34；
Described second rectification branch road 32 also includes and described second load 36 second bleeder circuits 38 in parallel, described second
Voltage Feedback control circuit 34, specifically for:
Obtain the described first outfan output voltage Vout1 the first outfan after the first bleeder circuit 37 dividing potential drop to divide
Piezoelectricity pressure VFB1, as the first feedback voltage, obtains described second outfan output voltage Vout2 through the second bleeder circuit 38
The second outfan branch pressure voltage VFB2 after dividing potential drop is as the second feedback voltage, by described first feedback voltage and second preset
Reference voltage REF2 compares and obtains bias voltage REF3, is carried out with described bias voltage REF3 by described second feedback voltage
Relatively obtain the second voltage error signal, control the controlled electricity of described second rectification branch road according to described second voltage error signal
The resistance of resistance circuit.
Wherein, the first bleeder circuit 37 can use resistance R1 and R2 of series connection to realize, it is also possible to as it is shown on figure 3, use
Resistance R5 and R6 of series connection realizes.Second bleeder circuit 38 can use resistance R3 and R4 of series connection to realize.
Specifically, described second feedback control circuit 34, including: second error amplifier the 341, second biased amplifier
342 and second reference voltage source 343, an input of described second biased amplifier 342 and described first rectification branch road 31
Outfan connects, and another input and the second reference voltage source 343 connect, alternatively, and an input of the second biased amplifier 342
End is connected with the dividing potential drop outfan of described first bleeder circuit 37, and an input of described second error amplifier 341 is with corresponding
The outfan of described second rectification branch road 32 connect, the outfan of another input and described second biased amplifier 342 is even
Connecing, alternatively, an input of the second error amplifier 341 is connected with the dividing potential drop outfan of described second bleeder circuit 38, institute
State the outfan of the second error amplifier as described in the outfan of the second feedback control circuit with described controlled resistor circuit
Controlled end connects.
Every described controlled resistor circuit 321 includes controlled current source 322 and field effect transistor Q2, described controlled current source
The end that controls of 322 is connected with the outfan of described second feedback control circuit 34, and one end of described controlled current source 322 is with described
The grid of field effect transistor Q2 connects, the source electrode of field effect transistor Q2 described in other end ground connection and drain electrode and described second rectification branch road 32
Outfan series connection.
One end of described controlled current source 322 is electric with the outfan bridging controlled current source dividing potential drop of described second rectification branch road
Resistance R7.
Wherein, field effect transistor Q2 is to be operated in the P-MOS pipe of linear zone, by changing the grid voltage of field effect transistor Q2,
Realize the Linear Control of the internal resistance of the source-leakage to field effect transistor Q2.First, steady when the first outfan output voltage Vout1 voltage
After fixed output, the second biased amplifier 342 needs Vout1 through the first bleeder circuit 37, enters with the second reference voltage REF2
Row compares, and its effect is to make bias voltage REF3 and the first outfan output voltage Vout1 have dependency, the second biased amplifier
The output bias voltage REF3 of 342 inputs and the second outfan output voltage as the reference voltage of the second error amplifier 341
After the Vout2 the second outfan branch pressure voltage VFB2 after the second bleeder circuit 38 dividing potential drop compares, output it
Two voltage error signal V-ICL input as the control of controlled current source 322.When the second outfan output voltage Vout2 voltage
Slightly raising, through anti-second feedback control circuit 34, the electric current of controlled current source 322 increases, and the pressure drop of divider resistance R7 increases
Adding, cause the equivalent source-drain electrodes internal resistance of field effect transistor Q2 to increase, source-leakage pressure drop raises, the second outfan output voltage Vout2
Drop to predeterminated voltage.It should be explicitly made clear at this point, the first outfan output voltage Vout1 and the second outfan output voltage Vout2
Dependency realized by the second biased amplifier 342, by change resistance R1 and R2 resistance, adjust the first outfan
During the output voltage of output voltage Vout1, the second outfan output voltage Vout2 responds the most simultaneously and changes.
Fig. 5 illustrates the first load voltage being in stable state output before, after load current increases sudden change, and the second load
Voltage by variable-resistance regulation from newly returning to preset the process of the state of constant voltage.Whole automatic control process will be entered below
Line description.As above figure supposes that trigger condition is that the first outfan output electric current increases suddenly, due to the first volt-ampere arranging device
Characteristic, the most instantaneous first load voltage (the i.e. first outfan output voltage) falls.Now the first feedback voltage is put by error
Big circuit exports the first error voltage (dotted line in Fig. 5) and raises simultaneously.First error voltage is carried out with sawtooth waveforms as input
Pulse-width signal after modulation output modulation, controls Q1 switching tube through overdrive circuit, adds beating in the switching tube cycle
ETAD expected time of arrival and departure, energy storage inductor electric potential energy increases, and compensate for the first outfan output voltage fallen owing to load electricity electric current increases.
Now increasing due to the common port voltage of the output of energy storage device L, the voltage of the second output rectification branch road increases (assumes now the
Two outfan output electric currents are not changed in, and the second rectifying device two ends pressure reduction is not changed in).Now by the second outfan feedback
The bias voltage of control circuit and error amplifier, the control current source current of awarding in variable resistance circuit reduces, variable resistance
The grid voltage of PMOS increases, and control resistance two ends pressure reduction is awarded in source and drain level internal resistance increase to be increased, and counteracts the second outfan output defeated
Going out the increment of voltage, the second load terminal voltage being comes back to preset voltage value, and final realization exports electricity at the first outfan
Rheology is, the voltage stabilizing output of the first load voltage and the second load controls.
The embodiment of the present invention, is provided with independent Voltage Feedback control circuit to the outfan of each rectification branch road,
Thus ensure the constant voltage performance of the outfan of each rectification branch road.Meanwhile, also achieve the first outfan output voltage Vout1 and
Correlation properties between second outfan output voltage Vout2.It addition, the first bleeder circuit increased and the second bleeder circuit,
The output voltage to operational amplifier can be adjusted, to ensure that the output voltage to computing discharger is linearly by resistance
In amplification range.Divide it addition, the outfan of one end of controlled current source 322 and described second rectification branch road bridges controlled current source
Piezoresistance R7, it is simple to control field effect transistor Q2.
Embodiment three
The circuit being illustrated in figure 4 a kind of D. C-D. C voltage converter that another alternative embodiment of the present invention provides is former
Reason figure, including: inducer L, switching device Q1, first Voltage Feedback control circuit the 33, first rectification branch road 31, at least one the
Two rectification branch roads 32 and at least one the second feedback control circuits 34；
Described inducer L one end for being connected with direct voltage source Vin, the other end respectively with described first rectification branch road 31
Input, the input of described second rectification branch road 32 and described switching device Q1 first switch terminals Q11 connect, institute
Stating the second switch end Q12 ground connection of switching device Q1, described first rectification branch road 31 outfan is powered for loading 35 to first,
Described second rectification branch road 32 outfan is for the second load 36 power supply；
Described first Voltage Feedback control circuit 33, is used for obtaining described first rectification branch road 31 outfan to the first load
The first outfan output voltage Vout1 of 35, as the first feedback voltage, controls described switch according to described first feedback voltage
First switch terminals Q11 of device Q1 and the on or off of second switch end Q12；
Every described second rectification branch road 32 includes a controlled electricity connected with the outfan of described second rectification branch road
Resistance circuit 321, and every described second rectification branch road 3 is corresponding with second feedback control circuit 34；
Described second feedback control circuit 34, specifically for: obtain corresponding described second rectification branch road 32 outfan
Second outfan output voltage Vout2 is as the second feedback voltage, by described second feedback voltage and the second benchmark electricity preset
Pressure REF2 compares and obtains tertiary voltage error signal, controls described second rectification according to described tertiary voltage error signal and props up
The resistance of the controlled resistor circuit 321 on road 32.
Specifically, described second feedback control circuit 34, including: the second error amplifier 341 and the second reference voltage source
343, an input of described second error amplifier 341 is connected with the outfan of described second rectification branch road 32, another input
End is connected with the second reference voltage source 343, and the outfan of described second error amplifier 341 is as the second feedback control circuit 34
Outfan be connected with the controlled end of described controlled resistor circuit 321.
The embodiment of the present invention, is provided with independent Voltage Feedback control circuit to the outfan of each rectification branch road,
Thus ensure the constant voltage performance of the outfan of each rectification branch road.Meanwhile, also achieve the first outfan output voltage Vout1 and
Uncorrelated nature between second outfan output voltage Vout2.
Last it is noted that above example is only in order to illustrate the technical scheme of the embodiment of the present invention, rather than it is limited
System；Although being described in detail the embodiment of the present invention with reference to previous embodiment, those of ordinary skill in the art should
Understand: the technical scheme described in foregoing embodiments still can be modified by it, or to wherein portion of techniques feature
Carry out equivalent；And these amendments or replacement, do not make the essence of appropriate technical solution depart from various embodiments of the present invention skill
The spirit and scope of art scheme.
Claims (10)
1. a D. C-D. C voltage converter, it is characterised in that including: inducer, switching device, the first Voltage Feedback control
Circuit processed, include the first rectification branch road of the first rectifying device, at least one the second rectification branch road including the second rectifying device
And at least one the second feedback control circuits；
Described inducer one end for being connected with direct voltage source, the other end respectively with the input of described first rectification branch road,
The input of described second rectification branch road and the first switch terminals of described switching device connect, the second of described switching device
Switch terminals ground connection, described first rectification branch road outfan is for the first load supplying, and described second rectification branch road outfan is used
In to the second load supplying；
Described first Voltage Feedback control circuit, for obtaining first defeated to the first load of described first rectification branch road outfan
Go out to hold output voltage as the first feedback voltage, control the first switch terminals of described switching device according to described first feedback voltage
On or off with second switch end；
Every described second rectification branch road includes a controlled resistor circuit connected with the outfan of described second rectification branch road,
And every described second rectification branch road is corresponding with second feedback control circuit；
Described second feedback control circuit, for obtaining corresponding described second rectification branch road outfan second to the second load
Outfan output voltage, as the second feedback voltage, controls the controlled of described second rectification branch road according to described second feedback voltage
The resistance of resistance circuit.
D. C-D. C voltage converter the most according to claim 1, it is characterised in that described second feedback control circuit,
Specifically for:
Obtain the second outfan output voltage of corresponding described second rectification branch road outfan as the second feedback voltage, acquisition
First outfan output voltage of described first rectification branch road outfan is as the first feedback voltage；
Described first feedback voltage is compared with the second reference voltage preset and obtains bias voltage, by described second feedback
Voltage and described bias voltage compare and obtain the second voltage error signal, control institute according to described second voltage error signal
State the resistance of the controlled resistor circuit of the second rectification branch road.
D. C-D. C voltage converter the most according to claim 2, it is characterised in that described second feedback control circuit,
Including: the second error amplifier, the second biased amplifier and the second reference voltage source, an input of described second biased amplifier
End is connected with the outfan of described first rectification branch road, and another input and the second reference voltage source connect, described second error
One input of amplifier connects with the outfan of corresponding described second rectification branch road, another input and described second biasing
The outfan of amplifier connects, and the outfan of described second error amplifier is as described in the outfan of the second feedback control circuit
It is connected with the controlled end of described controlled resistor circuit.
D. C-D. C voltage converter the most according to claim 1, it is characterised in that described second feedback control circuit,
Specifically for:
Second outfan output voltage of the described second rectification branch road outfan that acquisition is corresponding is as the second feedback voltage, by institute
State the second feedback voltage and the second default reference voltage compares and obtains tertiary voltage error signal, according to described 3rd electricity
Hold up the resistance that difference signal controls the controlled resistor circuit of described second rectification branch road.
D. C-D. C voltage converter the most according to claim 4, it is characterised in that described second feedback control circuit,
Including the second error amplifier and the second reference voltage source, an input of described second error amplifier is second whole with described
The outfan of stream branch road connects, and another input and the second reference voltage source connect, the outfan of described second error amplifier
It is connected with the controlled end of described controlled resistor circuit as the outfan of the second feedback control circuit.
D. C-D. C voltage converter the most according to claim 1, it is characterised in that every described controlled resistor circuit
Including controlled current source and field effect transistor, the outfan controlling end and described second feedback control circuit of described controlled current source
Connecting, one end of described controlled current source is connected with the grid of described field effect transistor, other end ground connection, the source of described field effect transistor
Pole and drain electrode are connected with the outfan of described second rectification branch road.
D. C-D. C voltage converter the most according to claim 6, it is characterised in that one end of described controlled current source
Controlled current source divider resistance is bridged with the outfan of described second rectification branch road.
8. according to the D. C-D. C voltage converter described in any one of claim 1～7, it is characterised in that:
Described first rectification branch road also includes and described first load the first bleeder circuit in parallel, and described acquisition is described first whole
First the first outfan output voltage loaded as the first feedback voltage, is specifically included by stream branch road outfan:
Obtain the first outfan branch pressure voltage conduct after the first bleeder circuit dividing potential drop of the described first outfan output voltage
First feedback voltage；
Described second rectification branch road also includes and described second load the second bleeder circuit in parallel, corresponding described of described acquisition
Second the second outfan output voltage loaded as the second feedback voltage, is specifically included by the second rectification branch road outfan:
Obtain the corresponding described second rectification branch road outfan the second outfan dividing potential drop electricity after the second bleeder circuit dividing potential drop
Pressure is as described second feedback voltage.
9. according to the D. C-D. C voltage converter described in any one of claim 1～7, it is characterised in that described first voltage
Feedback control circuit, specifically for:
Obtain described first rectification branch road outfan to the first the first outfan output voltage loaded as the first feedback voltage,
Described first feedback voltage is compared with the first reference voltage preset and obtains the first voltage error signal, to described first
Voltage error signal is modulated, and obtains being controlled by the pulse-width signal of described first voltage error signal, by described pulsewidth
Control signal is converted to drive signal, uses described driving signal to control the first switch terminals and the second switch of described switching device
The on or off of end.
D. C-D. C voltage converter the most according to claim 9, it is characterised in that described first Voltage Feedback controls
Circuit, including: the first error amplifier, the first reference voltage source, pulse width modulator, sawtooth generator and switching signal drive
Circuit, an input of described first error amplifier is connected with the outfan of described first rectification branch road, another input with
First reference voltage source connects, and an input of described pulse width modulator is connected with the outfan of described first error amplifier,
Another input is connected with the outfan of described sawtooth generator, the outfan of described pulse width modulator and described switching signal
The input of drive circuit connects, and the outfan of described switching signal drive circuit is as the outfan of the first feedback control circuit
It is connected with the controlled end of described switching device.
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| CN201610921730.4A CN106253673B (en) | 2016-10-21 | 2016-10-21 | A kind of D. C-D. C voltage converter |
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| CN201610921730.4A CN106253673B (en) | 2016-10-21 | 2016-10-21 | A kind of D. C-D. C voltage converter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113271019A (en) * | 2021-06-28 | 2021-08-17 | 湖南宏微电子技术有限公司 | Microcircuit DC-DC converter and conversion method thereof |
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| US20100165670A1 (en) * | 2007-05-30 | 2010-07-01 | Mauro Piazzesi | Multi-output synchronous flyback converter |
| CN102570796A (en) * | 2012-01-20 | 2012-07-11 | 华为技术有限公司 | Multi-path output boosting converter |
| CN202435272U (en) * | 2011-11-30 | 2012-09-12 | 四川九洲电器集团有限责任公司 | Multi-output power module |
| CN206302341U (en) * | 2016-10-21 | 2017-07-04 | 法乐第(北京)网络科技有限公司 | A kind of DC voltage changer |
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2016
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US20100165670A1 (en) * | 2007-05-30 | 2010-07-01 | Mauro Piazzesi | Multi-output synchronous flyback converter |
| CN202435272U (en) * | 2011-11-30 | 2012-09-12 | 四川九洲电器集团有限责任公司 | Multi-output power module |
| CN102570796A (en) * | 2012-01-20 | 2012-07-11 | 华为技术有限公司 | Multi-path output boosting converter |
| CN206302341U (en) * | 2016-10-21 | 2017-07-04 | 法乐第(北京)网络科技有限公司 | A kind of DC voltage changer |
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| CN113271019A (en) * | 2021-06-28 | 2021-08-17 | 湖南宏微电子技术有限公司 | Microcircuit DC-DC converter and conversion method thereof |
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