CN106253673B - A kind of D. C-D. C voltage converter - Google Patents
A kind of D. C-D. C voltage converter Download PDFInfo
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- CN106253673B CN106253673B CN201610921730.4A CN201610921730A CN106253673B CN 106253673 B CN106253673 B CN 106253673B CN 201610921730 A CN201610921730 A CN 201610921730A CN 106253673 B CN106253673 B CN 106253673B
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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
- H02M3/02—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 embodiment of the present invention discloses a kind of D. C-D. C voltage converter, comprising: inductor, switching device, first voltage feedback control circuit, the first rectification branch, at least one the second rectification branches and at least one second voltage feedback control circuit；First voltage feedback control circuit, for obtaining the first rectification branch output end to the first output end output voltage of the first load as the first feedback voltage, according to the on or off at the first switch end of the first feedback voltage control switch device and second switch end；Second voltage feedback control circuit, for obtaining corresponding second rectification branch output end to the second output terminal output voltage of the second load as the second feedback voltage, according to the resistance value of the controlled resistor circuit of the second feedback voltage control the second rectification branch.The embodiment of the present invention is provided with independent Voltage Feedback control circuit to the output end of each rectification branch, to guarantee the constant pressure performance of the output end of each rectification branch.
Description
Technical field
The present invention relates to electrical correlative technology field, especially a kind of D. C-D. C voltage converter.
Background technique
Current a large amount of electronics, electrical equipment and product use battery as power supply, but the output voltage of battery is non-constant
And voltage is lower.Therefore largely boosting voltage stabilizing technique comes into being in practical applications.But existing booster circuit output feedback
It can only track and export all the way, when there is output multi-load, noise crosstalk interference is serious between load, and the big inhibition of output ripple is difficult；It can not be real
Now the independent noise of each output loading is controlled；When a variety of different loads voltage text waves require, need multiple completely isolated straight
Boosting unit is flowed, the repetition of circuit design and the waste of element cost are caused.
As shown in Figure 1, illustrating a kind of DC boosting DC-DC voltage changer of boost topological structure.Its function is
Lower DC voltage source is transformed to the higher DC power supply of output voltage；Meanwhile ensureing output loading electricity in rated range
Output voltage is preset steady state value when rheology.L' is energy storage inductor, and Vin' is DC voltage source.In its normal work,
When switching tube Q' opens (when being connected over the ground), inductive current flows back to the cathode of Vin' power supply by switching tube Q' and earth-return.This
When, L' coil inside has accumulated certain energy.When Q' shutdown, the energy in L' is discharged into negative by rectifier diode D1'
Carry 12.The switch of a cycle is completed at this time.When switching tube Q' with some fixed switching frequency and duty ratio (turn-on time/
Switch periods) running hours, the power of input terminal is transferred effectively to output end, while the filter capacitor of output end
Cout' is by charge and discharge pressure stabilizing, and when load current is stablized, the pulse current that switch on and off generates is changed into steady voltage
Vout' exports electric current.And during this inductance L' electric discharge, the positive pressure in the same direction with Vin' is produced at inductance both ends
Difference, therefore it is higher than the input voltage of Vin' in the output end voltage of rectifying tube D'.And work as the setting to Q' switching frequency and duty ratio,
It so that the voltage that outputs and inputs of above-mentioned booster converter is reached a stable ratio, realize the mesh of DC boosting transformation
's.
In order to realize that a negative feedback control circuit 11 is added in above-mentioned DC-DC circuit, makes for constant voltage output, the prior art
The duty cycle of switching real-time change of Q' is fallen to compensate output end voltage Vout' caused by working as load current increase, from
And generate constant voltage output effect.
However, inventor has found during realizing invention, in actual circuit design application, largely need isolated
Multi output end DC-DC voltage boosting converter, as shown in Fig. 2, load 21 and 22 carries of load are in two mutually independent voltages
On output end.The output end of one public energy storage inductor L' is separately connected the anode of the D1' and D2' of rectifier diode.And D1'
Filter capacitor C1' and C2' and load 21 and 22 are respectively connected with the cathode of D2'.This double output ends press down the interference load
It is formed with significant effect.But simultaneously as above-mentioned only one Voltage Feedback of dual output voltage conversion circuit, therefore can only be to one
Output voltage carries out dynamic compensation, i.e. Vout1' has stable voltage output；And due to the C-V characteristic of D1' rectifier diode,
When 21 electric currents of load fluctuate, the tube voltage drop of D1' also fluctuates simultaneously, and the outlet Vout2' of no-voltage regulating power is caused to produce
Raw voltage fluctuation, loses constant pressure performance.
Summary of the invention
Based on this, it is necessary to cannot achieve constant pressure performance between the multi-load device of the same voltage source of the prior art
Technical problem provides 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, comprising: inductor, switching device, first voltage
Feedback control circuit, the first rectification branch, at least one the second rectification branches and at least one second voltage feedback control electricity
Road；
Described inductor one end with DC voltage source for connecting, the other end input with the first rectification branch respectively
The first switch end connection at end, the input terminal of the second rectification branch and the switching device, the of the switching device
Two switch terminals ground connection, the first rectification branch output end are used for the first load supplying, the second rectification branch output end
For to the second load supplying；
The first voltage feedback control circuit, for obtaining the first rectification branch output end to the of the first load
What one output end output voltage controlled the switching device as the first feedback voltage, according to first feedback voltage first opens
The on or off of Guan Duan and second switch end；
Every the second rectification branch includes the concatenated controlled resistor of output end of one with the second rectification branch
Circuit, and every the second rectification branch is corresponding with a second voltage feedback control circuit；
The second voltage feedback control circuit, it is negative to second for obtaining the corresponding second rectification branch output end
The second output terminal output voltage of load is as the second feedback voltage, according to second feedback voltage control the second rectification branch
The resistance value of the controlled resistor circuit on road.
Further, the second voltage feedback control circuit, is specifically used for:
The second output terminal output voltage of the corresponding second rectification branch output end is obtained as the second feedback voltage,
The first output end output voltage of the first rectification branch output end is obtained as the first feedback voltage；
First feedback voltage is compared to obtain bias voltage with preset second reference voltage, by described second
Feedback voltage is compared to obtain second voltage error signal with the bias voltage, according to the second voltage error signal control
Make the resistance value of the controlled resistor circuit of the second rectification branch.
Further, the second voltage feedback control circuit, comprising: the second error amplifier, the second biasing amplification
The output end of device and the second reference voltage source, an input terminal of second biased amplifier and the first rectification branch connects
It connects, another input terminal is connect with the second reference voltage source, an input terminal of second error amplifier and corresponding described
The output end connection of two rectification branches, another input terminal are connect with the output end of second biased amplifier, and described second misses
It is controlled with the controlled resistor circuit described in output end of the output end of poor amplifier as second voltage feedback control circuit
End connection.
Further, the second voltage feedback control circuit, is specifically used for:
The second output terminal output voltage of the corresponding second rectification branch output end is obtained as the second feedback voltage,
Second feedback voltage is compared to obtain tertiary voltage error signal with preset second reference voltage, according to described
Three voltage error signals control the resistance value of the controlled resistor circuit of the second rectification branch.
Further, the second voltage feedback control circuit, comprising: the second error amplifier and the second reference voltage
Source, an input terminal of second error amplifier are connect with the output end of the second rectification branch, another input terminal and the
The connection of two reference voltage sources, the output end of second error amplifier as second voltage feedback control circuit output end and
The controlled end of the controlled resistor circuit connects.
Further, every controlled resistor circuit includes controlled current source and field-effect tube, the controlled current source
Control terminal connect with the output end of the second voltage feedback control circuit, one end of the controlled current source and the field are imitated
Should pipe grid connection, the other end ground connection, the source electrode and drain electrode of the field-effect tube and it is described second rectification branch output end
Series connection.
Further, the output end of one end of the controlled current source and the second rectification branch bridges controlled current flow
Source divider resistance.
Further:
The first rectification branch further includes first bleeder circuit in parallel with first load, the acquisition described the
One rectification branch output end as the first feedback voltage, specifically includes the first output end output voltage of the first load:
Obtain first output end branch pressure voltage of the first output end output voltage after the first bleeder circuit partial pressure
As the first feedback voltage；
The second rectification branch further includes second bleeder circuit in parallel with second load, and the acquisition is corresponding
The second rectification branch output end is to the second output terminal output voltage of the second load as the second feedback voltage, specific packet
It includes:
Obtain second output terminal point of the corresponding second rectification branch output end after the second bleeder circuit partial pressure
Piezoelectricity pressure is used as second feedback voltage.
Further, the first voltage feedback control circuit, is specifically used for:
The first rectification branch output end is obtained to the first output end output voltage of the first load as the first feedback
First feedback voltage is compared to obtain first voltage error signal, to institute by voltage with preset first reference voltage
It states first voltage error signal to be modulated, the pulse-width signal for being controlled by the first voltage error signal is obtained, by institute
Stating pulse width modulated signal conversion is driving signal, and the first switch end and the of the switching device is controlled using the driving signal
The on or off of two switch terminals.
Further, the first voltage feedback control circuit, comprising: first error amplifier, the first reference voltage
Source, pulse width modulator, saw-toothed wave generator and switching signal driving circuit, an input terminal of the first error amplifier and institute
The output end connection of the first rectification branch is stated, another input terminal is connect with the first reference voltage source, and the one of the pulse width modulator
Input terminal is connect with the output end of the first error amplifier, and the output end of another input terminal and the saw-toothed wave generator connects
It connects, the output end of the pulse width modulator is connect with the input terminal of the switching signal driving circuit, the switching signal driving
The output end of circuit is connect as the output end of first voltage feedback control circuit with the controlled end of the switching device.
The embodiment of the present invention is provided with independent Voltage Feedback control circuit to the output end of each rectification branch,
To guarantee the constant pressure performance of each output end for rectifying branch.Emphasis solves the problems, such as the multiple of the prior art.First, it realizes
The tracking pressure stabilizing output of two-way or multichannel, output channel is mutually indepedent, noise crosstalk interference between isolation load.Second, each output is logical
Road ripple control excellent effect.Third realizes that multiple-channel output voltage is independent or relevant feedback control, power supply design flexibility are non-
Chang great.4th, the design of the more power supply output stages of single supply input stage greatly reduces cost, and reduce circuit space.This
Invention application circuit is simple, it can be used for separating element circuit design applied to IC design.
Detailed description of the invention
Fig. 1 is a kind of electricity of the DC boosting DC-DC voltage changer of single output end boost topological structure of the prior art
Road schematic diagram；
Fig. 2 is a kind of electricity of the DC boosting DC-DC voltage changer of double output ends boost topological structure of the prior art
Road schematic diagram；
Fig. 3 is a kind of circuit diagram for D. C-D. C voltage converter that one embodiment of the invention provides；
Fig. 4 is a kind of circuit diagram for D. C-D. C voltage converter that another alternative embodiment of the present invention provides；
Fig. 5 is a kind of working principle timing diagram for D. C-D. C voltage converter that one embodiment of the invention provides.
Specific embodiment
The present invention will be further described in detail in the following with reference to the drawings and specific embodiments.
Embodiment one
A kind of circuit diagram of D. C-D. C voltage converter of one embodiment of the invention offer, packet are provided
Include: inductor L, switching device Q1, first voltage feedback control circuit 33, first rectify branch 31, at least one the second rectifications
Branch 32 and at least one second voltage feedback control circuit 34；
For connecting with DC voltage source Vin, the other end rectifies branch 31 with described first respectively for the one end the inductor L
Input terminal, it is described second rectification branch 32 input terminal and the switching device Q1 the Q11 connection of first switch end, institute
The second switch end Q12 ground connection of switching device Q1 is stated, the first rectification 31 output end of branch is used for 35 power supply of the first load,
Second rectification, 32 output end of branch is used for 36 power supply of the second load；
The first voltage feedback control circuit 33 is loaded for obtaining first rectification 31 output end of branch to first
35 the first output end output voltage Vout1 controls the switch as the first feedback voltage, according to first feedback voltage
The on or off of the first switch end Q11 and second switch end Q12 of device Q1；
Every the second rectification branch 32 includes the concatenated controlled electricity of output end of one with the second rectification branch
Resistance circuit 321, and every the second rectification branch 32 is corresponding with a second voltage feedback control circuit 34；
The second voltage feedback control circuit 34, for obtaining corresponding second rectification 32 output end of branch to the
The second output terminal output voltage Vout2 of two loads 36 controls institute as the second feedback voltage, according to second feedback voltage
State the resistance value of the controlled resistor circuit 321 of the second rectification branch 32.
Specifically, as shown in figure 3, the first rectification branch 31 includes the first rectifying device D1, the second rectification branch 32 includes
Second rectifying device D2.Inductor L1 is energy storage inductor, and input terminal is connected with voltage source Vin.Voltage source Vin is entire circuit
Power source.Switching device Q1 is chosen as NMOS transistor composition, and when its conducting, inductive current is flowed to by switching device Q1
Earth-return, inductor L1 coil inside has accumulated energy at this time.When switching device Q1 shutdown, inductor L1 accumulation energy is at it
Internal generation potential, inductive current discharges under the action of it 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 to connect be first voltage feedback control circuit 33 with the output end of the first rectification branch 31, and with second
It is 34 that the output end connection for rectifying branch 32, which is second voltage feedback control circuit,.Can have one second rectification branch 32 or
Person's a plurality of second rectification branch 32 in parallel, every second rectification branch 32 is 34 with a second voltage feedback control circuit
Connection.Wherein, in Fig. 3 by taking one second rectification branch 32 as an example.
The output end of first rectification branch 31 is to the first output voltage Vout1 of the first load 35 as the first feedback electricity
Pressure is converted to the control signal with fixed cycle switch and variable duty ratio, to control by first voltage feed circuit 33
The first switch end of switching device Q1 and the turn-on and turn-off at second switch end.To realizing in power supply Vin, energy storage inductor L and
The pre-set constant voltage output of the first output voltage Vout1 in the first rectification this concatenated channel of branch 31.It is defeated for second
Outlet output voltage Vout2 is then serially connected in output channel using the controlled resistor circuit 321 of adjustable internal resistance.
Second voltage feedback control circuit 34 obtains corresponding second rectification 32 output end of branch to the second load 36
Second output terminal output voltage Vout2 as the second feedback voltage, for whole according to the second feedback voltage control described second
Flow the resistance value of the controlled resistor circuit 321 of branch 32.Therefore, the output circuit of the second rectification branch 32 is flowing through controlled resistor electricity
The pressure drop generated when road 321 can effectively realize the pressure stabilizing of the second output terminal output voltage Vout2 to the load of output second 36
It automatically controls.
The embodiment of the present invention is provided with independent Voltage Feedback control circuit to the output end of each rectification branch,
To guarantee the constant pressure performance of each output end for rectifying branch.
Embodiment two
A kind of D. C-D. C voltage converter that alternative embodiment of the present invention provides, comprising: inductor L, switching device
Q1, first voltage feedback control circuit 33, first rectify branch 31, at least one the second rectification branches 32 and at least one the
Two Voltage Feedback control circuits 34.
For connecting with DC voltage source Vin, the other end rectifies branch 31 with described first respectively for the one end the inductor L
Input terminal, it is described second rectification branch 32 input terminal and the switching device Q1 the Q11 connection of first switch end, institute
The second switch end Q12 ground connection of switching device Q1 is stated, the first rectification 31 output end of branch is used for 35 power supply of the first load,
Second rectification, 32 output end of branch is used for 36 power supply of the second load.
It is described first rectification branch 31 further include with it is described first load 35 first bleeder circuits 37 in parallel, described first
Voltage Feedback control circuit 33, is specifically used for:
Obtain first output end point of the first output end output voltage Vout1 after the first bleeder circuit 37 partial pressure
Piezoelectricity presses VFB1 as the first feedback voltage, and first feedback voltage is compared with preset first reference voltage REF1
First voltage error signal Err1 is obtained, the first voltage error signal Err1 is modulated, obtains being controlled by described
The pulse-width signal PWM-CTL is converted to driving letter by the pulse-width signal PWM-CTL of one voltage error signal Err1
Number, conducting or the pass of the first switch end Q11 and second switch end Q12 of the switching device Q1 are controlled using the driving signal
It is disconnected.
Specifically, the first voltage feedback control circuit 33, comprising: first error amplifier 331, the first reference voltage
Source 332, pulse width modulator 333, saw-toothed wave generator 334 and switching signal driving circuit 335, the first error amplifier
331 input terminal is connect with the output end of the first rectification branch 31, and another input terminal and the first reference voltage source 332 connect
It connects, optionally, an input terminal of first error amplifier 331 is connect with the partial pressure output end of first bleeder circuit, described
One input terminal of pulse width modulator 333 is connect with the output end of the first error amplifier 331, another input terminal and the saw
The output end of tooth wave producer 334 connects, the output end of the pulse width modulator 333 and the switching signal driving circuit 335
Input terminal connection, output of the output end of the switching signal driving circuit 335 as first voltage feedback control circuit 33
End is connect with the controlled end Q13 of the switching device Q1.
First bleeder circuit 37 includes concatenated resistance R1 and resistance R2, the first output end branch pressure voltage VFB1 are resistance R1
With the voltage of the tie point of resistance R2.
First voltage feedback control circuit 33 is worked as by the duty cycle of switching real-time change to switching device Q1 to compensate
What the first output end output voltage Vout1 caused by load current increases was occurred falls, to generate constant voltage output effect.Such as
The first output end output voltage Vout1 is sampled and divided in Fig. 3, the first bleeder circuit 37 exports VFB and amplifies to error
Device 331 is missed in the first voltage that the first reference voltage REF1 exported with the first reference voltage source 332 carries out differential amplification output
Difference signal Err1.First voltage error signal Err1 is by the modulated output signal PWM-CTL of pulse width modulator 333 by driving
Dynamic circuit 335, which is realized, controls the on-off of switching device Q1.The above process realizes the first output end output voltage Vout1 voltage
Dynamic constant-pressure compensation control.
Every the second rectification branch 32 includes the concatenated controlled electricity of output end of one with the second rectification branch
Resistance circuit 321, and every the second rectification branch 3 is corresponding with a second voltage feedback control circuit 34；
It is described second rectification branch 32 further include with it is described second load 36 second bleeder circuits 38 in parallel, described second
Voltage Feedback control circuit 34, is specifically used for:
Obtain first output end point of the first output end output voltage Vout1 after the first bleeder circuit 37 partial pressure
Piezoelectricity presses VFB1 as the first feedback voltage, obtains the second output terminal output voltage Vout2 by the second bleeder circuit 38
Second output terminal branch pressure voltage VFB2 after partial pressure is as the second feedback voltage, by first feedback voltage and preset second
Reference voltage REF2 is compared to obtain bias voltage REF3, and second feedback voltage and the bias voltage REF3 are carried out
Compare to obtain second voltage error signal, the controlled electricity of the second rectification branch is controlled according to the second voltage error signal
The resistance value of resistance circuit.
Wherein, the first bleeder circuit 37 can be realized using concatenated resistance R1 and R2, can also with as shown in figure 3, using
Concatenated resistance R5 and R6 is realized.Second bleeder circuit 38 can be realized using concatenated resistance R3 and R4.
Specifically, the second voltage feedback control circuit 34, comprising: the biasing of the second error amplifier 341, second is put
Big device 342 and the second reference voltage source 343, an input terminal of second biased amplifier 342 and the first rectification branch
31 output end connection, another input terminal are connect with the second reference voltage source 343, optionally, the one of the second biased amplifier 342
Input terminal is connect with the partial pressure output end of first bleeder circuit 37, an input terminal of second error amplifier 341 with
The output end connection of the corresponding second rectification branch 32, the output of another input terminal and second biased amplifier 342
End connection, optionally, the partial pressure output end of an input terminal of the second error amplifier 341 and second bleeder circuit 38 connect
Connect, described in output end of the output end of second error amplifier as second voltage feedback control circuit with the controlled electricity
The controlled end of resistance circuit connects.
Every controlled resistor circuit 321 includes controlled current source 322 and field-effect tube Q2, the controlled current source
322 control terminal is connect with the output end of the second voltage feedback control circuit 34, one end of the controlled current source 322 with
The grid of the field-effect tube Q2 connects, and the other end is grounded the source electrode and drain electrode and the second rectification branch of the field-effect tube Q2
The output end on road 32 is connected.
The output end bridging controlled current source partial pressure electricity of one end of the controlled current source 322 and the second rectification branch
Hinder R7.
Wherein, field-effect tube Q2 is that work is managed in the P-MOS of linear zone, by changing the grid voltage of field-effect tube Q2,
Realize the Linear Control of source-leakage internal resistance to field-effect tube Q2.Firstly, when the first output end output voltage Vout1 voltage is steady
After fixed output, the second biased amplifier 342 is needed Vout1 by the first bleeder circuit 37, with the second reference voltage REF2 into
Row compares, and effect is that bias voltage REF3 and the first output end output voltage Vout1 is made to have correlation, the second biased amplifier
Reference voltage input and second output terminal output voltage of the 342 output bias voltage REF3 as the second error amplifier 341
After second output terminal branch pressure voltage VFB2 of the Vout2 after the second bleeder circuit 38 partial pressure is compared, output it the
Two voltage error signal V-ICL are inputted as the control of controlled current source 322.When second output terminal output voltage Vout2 voltage
It slightly increases, by anti-second voltage feedback control circuit 34, the electric current of controlled current source 322 increases, the pressure of divider resistance R7
Drop increases, and the equivalent source-drain electrodes internal resistance of field-effect tube Q2 is caused to increase, and source-leakage pressure drop increases, second output terminal output voltage
Vout2 drops to predeterminated voltage.It should be clear that the first output end output voltage Vout1 and second output terminal output voltage
The correlation of Vout2 is realized by the second biased amplifier 342, by changing the resistance value of resistance R1 and R2, adjustment first
When the output voltage of output end output voltage Vout1, second output terminal output voltage Vout2 is also responded simultaneously and is changed.
The first load voltage in stable state output before Fig. 5 is illustrated, after load current increases mutation, the second load
Voltage passes through the adjusting of variable resistance from the process for the state for newly returning to default constant pressure.Below will to entire automatic control process into
Row description.As above figure assumes that trigger condition is that the first output end output electric current increases suddenly, the volt-ampere for arranging device due to first
Characteristic, i.e., instantaneous first load voltage (i.e. the first output end output voltage) are fallen.The first feedback voltage is put by error at this time
Big circuit output first error voltage (dotted line in Fig. 5) raises simultaneously.First error voltage is carried out as input and sawtooth wave
Modulation exports modulated pulse-width signal, controls Q1 switching tube through overdrive circuit, increases beating in the switching tube period
ETAD expected time of arrival and departure, energy storage inductor potential can increase, and compensate for the first output end output voltage for increasing and falling due to loading electric electric current.
At this time since the common end voltage of the output of energy storage device L increases, the voltage of the second output rectification branch increases (assuming that at this time the
Two output ends output electric current does not change, and the second rectifying device both ends pressure difference does not change).It is fed back at this time by second output terminal
The bias voltage and error amplifier of control circuit, the control current source current of awarding in variable resistance circuit reduce, variable resistance
The grid voltage of PMOS increases, and source and drain grade internal resistance increase is awarded control resistance both ends pressure difference and increased, and it is defeated to counteract second output terminal output
The increment of voltage out, the second load terminal voltage for being come back to preset voltage value, and final realize exports electricity in the first output end
Rheology is that the pressure stabilizing of the first load voltage and the second load exports control.
The embodiment of the present invention is provided with independent Voltage Feedback control circuit to the output end of each rectification branch,
To guarantee the constant pressure performance of each output end for rectifying branch.Meanwhile also achieve the first output end output voltage Vout1 and
Correlation properties between second output terminal output voltage Vout2.In addition, increased first bleeder circuit and the second bleeder circuit,
The voltage being output on operational amplifier can be adjusted by resistance, to guarantee the voltage being output on operation discharger linear
In amplification range.In addition, the output end bridging controlled current source point of one end of controlled current source 322 and the second rectification branch
Piezoresistance R7, convenient for control field-effect tube Q2.
Embodiment three
The circuit for 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, comprising: inductor L, switching device Q1, first voltage feedback control circuit 33, first rectify branch 31, at least one the
Two rectification branches 32 and at least one second voltage feedback control circuit 34；
For connecting with DC voltage source Vin, the other end rectifies branch 31 with described first respectively for the one end the inductor L
Input terminal, it is described second rectification branch 32 input terminal and the switching device Q1 the Q11 connection of first switch end, institute
The second switch end Q12 ground connection of switching device Q1 is stated, the first rectification 31 output end of branch is used for 35 power supply of the first load,
Second rectification, 32 output end of branch is used for 36 power supply of the second load；
The first voltage feedback control circuit 33 is loaded for obtaining first rectification 31 output end of branch to first
35 the first output end output voltage Vout1 controls the switch as the first feedback voltage, according to first feedback voltage
The on or off of the first switch end Q11 and second switch end Q12 of device Q1；
Every the second rectification branch 32 includes the concatenated controlled electricity of output end of one with the second rectification branch
Resistance circuit 321, and every the second rectification branch 3 is corresponding with a second voltage feedback control circuit 34；
The second voltage feedback control circuit 34, is specifically used for: obtaining the corresponding second rectification branch 32 and exports
The second output terminal output voltage Vout2 at end is as the second feedback voltage, by second feedback voltage and preset second base
Quasi- voltage REF2 is compared to obtain tertiary voltage error signal, whole according to tertiary voltage error signal control described second
Flow the resistance value of the controlled resistor circuit 321 of branch 32.
Specifically, the second voltage feedback control circuit 34, comprising: the second error amplifier 341 and the second benchmark electricity
Potential source 343, an input terminal of second error amplifier 341 is connect with the output end of the second rectification branch 32, another
Input terminal is connect with the second reference voltage source 343, and the output end of second error amplifier 341 is fed back as second voltage to be controlled
The output end of circuit 34 processed is connect with the controlled end of the controlled resistor circuit 321.
The embodiment of the present invention is provided with independent Voltage Feedback control circuit to the output end of each rectification branch,
To guarantee the constant pressure performance of each output end for rectifying branch.Meanwhile also achieve the first output end output voltage Vout1 and
Uncorrelated nature between second output terminal output voltage Vout2.
Finally, it should be noted that above embodiments are only to illustrate the technical solution of the embodiment of the present invention, rather than it is limited
System；Although the embodiment of the present invention is described in detail with reference to the foregoing embodiments, those skilled in the art should
Understand: it is still possible to modify the technical solutions described in the foregoing embodiments, or to part of technical characteristic
It is equivalently replaced；And these are modified or replaceed, various embodiments of the present invention skill that it does not separate the essence of the corresponding technical solution
The spirit and scope of art scheme.
Claims (9)
1. a kind of D. C-D. C voltage converter characterized by comprising inductor, switching device, first voltage feedback control
Circuit processed, the first rectification branch including the first rectifying device, at least one include the second rectifying device the second rectification branch
And at least one second voltage feedback control circuit；
Described inductor one end for connect with DC voltage source, the other end rectified respectively with described first branch input terminal,
The first switch end connection of the input terminal and the switching device of the second rectification branch, the second of the switching device
Switch terminals ground connection, the first rectification branch output end are used for the first load supplying, and the second rectification branch output end is used
In to the second load supplying；
The first voltage feedback control circuit, for obtaining the first rectification branch output end to the first defeated of the first load
Outlet output voltage controls the first switch end of the switching device according to first feedback voltage as the first feedback voltage
With the on or off at second switch end；
Every the second rectification branch includes the concatenated controlled resistor circuit of output end of one with the second rectification branch,
And every the second rectification branch is corresponding with a second voltage feedback control circuit；
The second voltage feedback control circuit, for obtaining the corresponding second rectification branch output end to the second load
Second output terminal output voltage controls the second rectification branch as the second feedback voltage, according to second feedback voltage
The resistance value of controlled resistor circuit；
Every controlled resistor circuit includes controlled current source and field-effect tube, the control terminal of the controlled current source with it is described
The output end of second voltage feedback control circuit connects, and the grid of one end of the controlled current source and the field-effect tube connects
It connects, other end ground connection, the source electrode and drain electrode of the field-effect tube is connected with the output end of the second rectification branch.
2. D. C-D. C voltage converter according to claim 1, which is characterized in that the second voltage feedback control
Circuit is specifically used for:
The second output terminal output voltage of the corresponding second rectification branch output end is obtained as the second feedback voltage, is obtained
First output end output voltage of the first rectification branch output end is as the first feedback voltage；
First feedback voltage is compared to obtain bias voltage with preset second reference voltage, described second is fed back
Voltage is compared to obtain second voltage error signal with the bias voltage, controls institute according to the second voltage error signal
State the resistance value of the controlled resistor circuit of the second rectification branch.
3. D. C-D. C voltage converter according to claim 2, which is characterized in that the second voltage feedback control
Circuit, comprising: the second error amplifier, the second biased amplifier and the second reference voltage source, second biased amplifier
One input terminal is connect with the output end of the first rectification branch, and another input terminal is connect with the second reference voltage source, and described the
The output end of one input terminal of two error amplifiers and the corresponding second rectification branch connects, another input terminal and described the
The output end of two biased amplifiers connects, and the output end of second error amplifier is as second voltage feedback control circuit
Output end is connect with the controlled end of the controlled resistor circuit.
4. D. C-D. C voltage converter according to claim 1, which is characterized in that the second voltage feedback control
Circuit is specifically used for:
The second output terminal output voltage of the corresponding second rectification branch output end is obtained as the second feedback voltage, by institute
It states the second feedback voltage to be compared to obtain tertiary voltage error signal with preset second reference voltage, according to the third electricity
Hold up the resistance value that difference signal controls the controlled resistor circuit of the second rectification branch.
5. D. C-D. C voltage converter according to claim 4, which is characterized in that the second voltage feedback control
Circuit, comprising: the second error amplifier and the second reference voltage source, an input terminal of second error amplifier and described the
The output ends connection of two rectification branches, another input terminal connect with the second reference voltage source, second error amplifier it is defeated
Outlet is connect as the output end of second voltage feedback control circuit with the controlled end of the controlled resistor circuit.
6. D. C-D. C voltage converter according to claim 5, which is characterized in that one end of the controlled current source
Controlled current source divider resistance is bridged with the output end of the second rectification branch.
7. described in any item D. C-D. C voltage converters according to claim 1~6, it is characterised in that:
The first rectification branch further includes first bleeder circuit in parallel with first load, and the acquisition described first is whole
Branch output end is flowed to the first output end output voltage of the first load as the first feedback voltage, is specifically included:
Obtain first output end branch pressure voltage conduct of the first output end output voltage after the first bleeder circuit partial pressure
First feedback voltage；
The second rectification branch further includes second bleeder circuit in parallel with second load, and the acquisition is corresponding described
Second rectification branch output end as the second feedback voltage, specifically includes the second output terminal output voltage of the second load:
Obtain second output terminal partial pressure electricity of the corresponding second rectification branch output end after the second bleeder circuit partial pressure
Pressure is used as second feedback voltage.
8. described in any item D. C-D. C voltage converters according to claim 1~6, which is characterized in that the first voltage
Feedback control circuit is specifically used for:
The first rectification branch output end is obtained to the first output end output voltage of the first load as the first feedback voltage,
First feedback voltage is compared to obtain first voltage error signal with preset first reference voltage, to described first
Voltage error signal is modulated, and the pulse-width signal for being controlled by the first voltage error signal is obtained, by the pulsewidth
Modulated signal is converted to driving signal, and first switch end and the second switch of the switching device are controlled using the driving signal
The on or off at end.
9. D. C-D. C voltage converter according to claim 8, which is characterized in that the first voltage feedback control
Circuit, comprising: first error amplifier, the first reference voltage source, pulse width modulator, saw-toothed wave generator and switching signal driving
Circuit, an input terminal of the first error amplifier with it is described first rectification branch output end connect, another input terminal and
The connection of first reference voltage source, an input terminal of the pulse width modulator are connect with the output end of the first error amplifier,
Another input terminal is connect with the output end of the saw-toothed wave generator, the output end of the pulse width modulator and the switching signal
The input terminal of driving circuit connects, and the output end of the switching signal driving circuit is as the defeated of first voltage feedback control circuit
Outlet is connect with the controlled end of the switching device.
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|---|---|---|---|---|
| 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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| JP4975166B2 (en) * | 2007-05-30 | 2012-07-11 | パワー−ワン イタリー ソシエタ ペル アチオニ | Multi-output synchronous flyback converter |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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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