CN108023480A - Can dynamic voltage adjustment DC-DC conversion circuits - Google Patents
Can dynamic voltage adjustment DC-DC conversion circuits Download PDFInfo
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- CN108023480A CN108023480A CN201711455399.2A CN201711455399A CN108023480A CN 108023480 A CN108023480 A CN 108023480A CN 201711455399 A CN201711455399 A CN 201711455399A CN 108023480 A CN108023480 A CN 108023480A
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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
- H02M3/157—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 with digital control
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/14—Arrangements for reducing ripples from dc input or output
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- 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
- H02M3/158—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 including plural semiconductor devices as final control devices for a single load
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0006—Arrangements for supplying an adequate voltage to the control circuit of converters
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The embodiment of the invention discloses it is a kind of can dynamic voltage adjustment DC DC conversion circuits, including voltage regulation filtering input circuit, on-off circuit, energy storage filtering output circuit, synchronous buck control circuit, voltage feedback circuit and digital voltage regulator circuit, voltage feedback circuit is used for synchronous buck control circuit output feedback voltage and offset voltage, digital voltage regulator circuit, which is used to export to the voltage feedback circuit by digital analog converter DAC units, adjusts voltage, to change the feedback voltage.The embodiment of the present invention realizes the dynamic of DC DC conversion circuit output voltages under low-voltage, high current, accurately adjusts.
Description
Technical field
The present invention relates to the power supply power supply technique of computing device, more particularly to it is a kind of can the DC-DC of dynamic voltage adjustment change
Circuit.
Background technology
DC-DC power module is the power supply unit that can directly mount on a printed circuit, there is decompression and boosting two
Kind, its main feature is that can be that application-specific integrated circuit (ASIC), digital signal processor (DSP), microprocessor, memory, scene can
Programming gate array (FPGA) and other numerals or fictitious load are powered.
With the development of large scale integrated circuit and distributed computing technology, there is the parallel connection of multiple ic chip or string
The computing device of connection.This computing device in parallel or series, which is powered, needs that using DC-DC power module electricity will be inputted
Pressure is converted to the multiple IC chips supplied voltage in parallel or series and is carried out at the same time power supply, and the quantity of chip is different with internal resistance, supplies
The required supply voltage of circuit also can be different, and most of high performance chips generally use low-voltages, high current work, work
Working frequency is higher, this driving force to power supply, the ripple of output voltage and maximum output current all have high requirements, and give
The design of DC-DC power module brings challenge.
In order to enable DC-DC power module provides variable output voltage, occurs the DC-DC electricity of pressure-adjustable in the prior art
Source module.The Chinese patent application of publication number CN1713500A discloses a kind of Switching Power Supply of adjusting output voltage, its is right
The sampling error amplifying circuit of Switching Power Supply adds exterior control function, sampling voltage or reference voltage can be carried out from outside
Change, so as to adjust output voltage.The Chinese patent application of publication number CN103891118A discloses a kind of with adjustable
The DC converters of output voltage, its direct voltage source of connecting in divider resistance one end, by varying the electricity of the direct voltage source
Pressure is so as to adjust the output voltage of DC converters.
However, in system application, the adjusting of the output voltage of DC power module usually needs more accurately dynamic regulation,
This just needs to optimize the feedback circuit in existing DC-DC power module and regulating circuit.Therefore, it is necessary to one kind
It is capable of the DC-DC conversion circuits of more accurately dynamic voltage adjustment, fast response time under low-voltage, high current.
The content of the invention
One aspect of the present invention propose it is a kind of can dynamic voltage adjustment DC-DC conversion circuits, including：
Voltage regulation filtering input circuit, for connecting input voltage, voltage stabilizing and filtering are carried out to input voltage；
On-off circuit, for connecting input voltage, energy storage is filtered output electricity by the turn-on and turn-off of switching device
Road charges and discharges；
Energy storage filters output circuit, for connecting valve circuit, the turn-on and turn-off based on switching device in on-off circuit
To charge and discharge, so as to provide output voltage；
Synchronous buck control circuit, for connecting voltage feedback circuit and on-off circuit, the output of receiving voltage feedback circuit
Feedback voltage and offset voltage, and according to the driving control signal of the feedback voltage and offset voltage output switch circuit,
So as to which controlling switch circuit adjusts output voltage；
Voltage feedback circuit, for connecting output voltage, synchronous buck control circuit and digital voltage regulator circuit, to described same
Walk voltage reduction circuit output feedback voltage and offset voltage；
Digital voltage regulator circuit, for connecting voltage feedback circuit, it is by digital analog converter DAC units to the electricity
Feedback circuit output is pressed to adjust voltage, to change the feedback voltage.
In some embodiments, the voltage feedback circuit includes the first, second, third, fourth, the 5th resistance (R1-
R5) and the first, second, third, fourth, the 5th capacitance (C8-C12), first resistor (R1) one end connect second resistance (R2),
Second resistance (R2) other end is grounded, the output voltage that first resistor (R1) other end coupling energy storage filtering output circuit provides,
The both ends of first resistor (R1) are connected across after first capacitance (C8) and 3rd resistor (R3) series connection, wherein the first capacitance (C8) bridges
In one end of first resistor (R1) connection output voltage, 3rd resistor (R3) is connected across first resistor (R1) connection second resistance
(R2) one end；One end of first resistor (R1) connection second resistance (R2) is sequentially connected in series the second capacitance (C9) and the 3rd capacitance
(C10), the second electricity is connected across after the other end ground connection of the 3rd capacitance (C10), the 4th capacitance (C11) and the series connection of the 4th resistance (R4)
Hold the both ends of (C9), wherein the 4th capacitance (C11) is connected across one end of the second capacitance (C9) connection first resistor (R1), the 4th electricity
Resistance (R4) is connected across one end that the second capacitance (C9) connects the 3rd capacitance (C10), the second capacitance (C9) connection first resistor (R1)
One end output feedback voltage, the second capacitance (C9) connect the 3rd capacitance (C10) one end output offset voltage；5th resistance
(R5) one end connection feedback voltage, the adjusting voltage of other end connection digital voltage regulator circuit output, while the 5th resistance (R5)
The other end the 5th capacitance (C12) of series connection, the 5th capacitance (C12) other end ground connection
In some embodiments, the digital analog converter DAC output pins connection the 6th of the digital voltage regulator circuit
Resistance (R6), the other end of the 6th resistance (R6) export the adjusting voltage.
In some embodiments, the on-off circuit includes a pair of upper metal-oxide-semiconductor and a pair of lower metal-oxide-semiconductor, it is the pair of on
The drain electrode of metal-oxide-semiconductor is connected with sources connected in parallel, and the drain electrode of the pair of lower metal-oxide-semiconductor is connected with sources connected in parallel, the pair of upper metal-oxide-semiconductor
Drain electrode connect the input voltage, the source electrode connection ground of the pair of lower metal-oxide-semiconductor, the source electrode of the pair of upper metal-oxide-semiconductor and institute
The drain electrode for stating metal-oxide-semiconductor under a pair is connected by switching node.
In some embodiments, the grid of the pair of upper metal-oxide-semiconductor connects metal-oxide-semiconductor driving control signal, institute respectively
The grid for stating metal-oxide-semiconductor under a pair connects lower metal-oxide-semiconductor driving control signal respectively, and the upper metal-oxide-semiconductor driving control signal is used to control
The turn-on and turn-off of the pair of upper metal-oxide-semiconductor are made, the lower metal-oxide-semiconductor driving control signal is used to control the pair of lower metal-oxide-semiconductor
Turn-on and turn-off.
In some embodiments, opening between the drain electrode of the source electrode of the pair of upper metal-oxide-semiconductor and the pair of lower metal-oxide-semiconductor
Artis connecting valve signal, the switching signal are used for the conducting circuit for controlling the switching node.
In some embodiments, the digital voltage regulator circuit includes MCU microcontrollers, the digital analog converter DAC
Unit is integrated in the MCU microcontrollers.
In some embodiments, the synchronous buck control circuit is according on the feedback voltage and offset voltage output
Metal-oxide-semiconductor driving control signal, lower metal-oxide-semiconductor driving control signal and switching signal.
In some embodiments, the voltage regulation filtering input circuit, which is included between Input voltage terminal and ground, is connected in parallel
One group of capacitance (C1-C3).
In some embodiments, the energy storage filtering output circuit includes the source that one end connects the pair of upper metal-oxide-semiconductor
The inductance (L1) of switching node between the drain electrode of pole and the pair of lower metal-oxide-semiconductor, the other end of inductance (L1) provide output voltage.
In some embodiments, the energy storage filtering output circuit is included between the other end and ground of inductance (L1) simultaneously
Join one group of capacitance (C4-C8) of connection.
In some embodiments, the DC-DC conversion circuits further include the drive for connecting the synchronous buck control circuit
Dynamic circuit.
The embodiment of the present invention is by being improved the feedback circuit of existing DC-DC conversion circuits, and binding number type matrix
Intend converter DAC output and adjust voltage, realize the dynamic of DC-DC conversion circuits output voltage under low-voltage, high current, accurate
Ground is adjusted.
Brief description of the drawings
Fig. 1 be the present invention can dynamic voltage adjustment DC-DC conversion circuits an embodiment structure diagram.
Fig. 2 be the present invention can dynamic voltage adjustment DC-DC conversion circuits an embodiment a part of circuit diagram.
Fig. 3 be the present invention can dynamic voltage adjustment DC-DC conversion circuits an embodiment another partial circuit signal
Figure.
Fig. 4 be the present invention can dynamic voltage adjustment DC-DC conversion circuits an embodiment another partial circuit signal
Figure.
Fig. 5 be the present invention can dynamic voltage adjustment DC-DC conversion circuits an embodiment another partial circuit signal
Figure.
Embodiment
For the object, technical solutions and advantages of the present invention are more clearly understood, below in conjunction with specific embodiment, and reference
Attached drawing, the present invention is described in more detail.
Fig. 1 be the present invention can dynamic voltage adjustment DC-DC conversion circuits an embodiment structure diagram.Such as Fig. 1
It is shown, it is of the invention can the DC-DC conversion circuits of dynamic voltage adjustment include voltage regulation filtering input circuit 10, on-off circuit 20, energy storage
Filter output circuit 30, synchronous buck control circuit 40, drive circuit 50 and dynamic voltage adjustment module 60.
Voltage regulation filtering input circuit 10 is used to connect input voltage DC_IN, and voltage stabilizing and filter are carried out to input voltage DC_IN
Ripple.On-off circuit 20 is used to connect input voltage DC_IN, and is exported by the turn-on and turn-off of switching device to be filtered to energy storage
Circuit 30 charges and discharges so that energy storage filtering output circuit 30 exports transformed output voltage DC_OUT.Energy storage is filtered
Ripple output circuit 30 is used for connecting valve circuit 20, is charged based on the turn-on and turn-off of switching device in on-off circuit 20
And electric discharge, so as to provide transformed output voltage DC_OUT.Synchronous buck control circuit 40 connects drive circuit 50, dynamic is adjusted
Die block 60 and on-off circuit 20, under the driving effect of drive circuit 50, it receives the feedback of the input of dynamic voltage adjustment circuit 60
Voltage and offset voltage, and the drive of the feedback voltage and offset voltage output switch circuit 20 inputted according to dynamic voltage adjustment module 60
Dynamic control signal, so that the turn-on and turn-off of switching device carry out to filter output circuit 30 to energy storage in controlling switch circuit 20
It is charged and discharged so that the output voltage DC_OUT of energy storage filtering output circuit 30 reaches desired value.Drive circuit 50 be used for
Synchronous buck control circuit 40 provides drive signal, makes its normal work.
Dynamic voltage adjustment module 60 includes voltage feedback circuit 61 and digital voltage regulator circuit 62, and voltage feedback circuit 61 is used to connect
The output voltage DC_OUT of energy storage filtering output circuit 30 is met, feedback voltage and compensation electricity are obtained by partial pressure and filter circuit
Pressure, and input synchronous buck control circuit 40；Digital voltage regulator circuit 62, which is used to provide to voltage feedback circuit 61, adjusts voltage DA_
OUT so that the feedback voltage that voltage feedback circuit 61 exports changes so that synchronous buck control circuit 40 adjusts output electricity
DC_OUT is pressed, realizes the dynamic regulation and quick response to output voltage.
In the embodiment of the present invention, the input voltage of voltage regulation filtering input circuit 10 can be 12V DC voltage, on-off circuit
20 can support the output of high current, and dynamic voltage adjustment module 60 can provide dynamic in predetermined voltage range, accurately adjust
Pressure.
Fig. 2 for the present invention can voltage regulation filtering input circuit 10 in the DC-DC conversion circuits of dynamic voltage adjustment, on-off circuit 20,
The circuit diagram of one embodiment of energy storage filtering output circuit 30.As shown in Fig. 2, voltage regulation filtering input circuit 10 includes
One group of capacitance C1-C4 being connected in parallel between input voltage DC_IN ends and ground GND.
In the embodiment of the present invention, C1 uses the patch capacitor of 22uF/25V, and C2-C4 is electric using the large capacity of 1000uF/16V
Capacitance is solved, voltage regulation filtering is carried out to input voltage DC_IN by the parallel combination of C1-C4.
On-off circuit 20 includes a pair of upper metal-oxide-semiconductor MOS1, MOS2, and a pair of lower metal-oxide-semiconductor MOS3, MOS4, MOS1, MOS2
Source electrode and drain electrode be connected in parallel, the source electrode of MOS3, MOS4 and drain electrode are connected in parallel, the source electrode and MOS3, MOS4 of MOS1, MOS2
Drain electrode be connected by switching node (not shown), the source electrode of MOS3 and MOS4 ground connection, input voltage DC_IN is inputted respectively
The drain electrode of MOS1 and MOS2.Switching node between the drain electrode of the source electrode and MOS3, MOS4 of MOS1, MOS2 is connected to energy storage filtering
The inductance L1 of output circuit 30.The grid of MOS1 and MOS2 connects metal-oxide-semiconductor driving control signal DH, upper metal-oxide-semiconductor driving respectively
Control signal DH is used for the turn-on and turn-off for controlling MOS1 and MOS2；The grid of MOS3 and MOS4 connects lower metal-oxide-semiconductor driving respectively
Control signal DL, lower metal-oxide-semiconductor driving control signal DL are used for the turn-on and turn-off for controlling MOS3 and MOS4.The source of MOS1, MOS2
Switching node connecting valve the signal LX, switching signal LX of the drain electrode of pole connection MOS3, MOS4 are between metal-oxide-semiconductor above and below controlling
Switching node conducting circuit.
Energy storage filtering output circuit 30 is connected between the drain electrode of source electrode and MOS3, MOS4 of MOS1, MOS2 including one end
The inductance L1 of switching node, and one group of capacitance C5-C7 being connected in parallel between the other end and ground GND of inductance L1, capacitance
One end of C5-C7 connection inductance L1 provides output voltage DC_OUT at the same time.When upper metal-oxide-semiconductor MOS1, MOS2 exist in on-off circuit 20
Turned under the control of upper metal-oxide-semiconductor driving control signal DH, controls of lower metal-oxide-semiconductor MOS3, the MOS4 in lower metal-oxide-semiconductor driving control signal DL
Under system during shut-off, input voltage DC_IN carries out charging energy-storing to inductance L1 and capacitance C5-C7 so that output voltage DC_OUT liters
Pressure；Turned off when going up metal-oxide-semiconductor MOS1, MOS2 in on-off circuit 20 under the control of upper metal-oxide-semiconductor driving control signal DH, lower metal-oxide-semiconductor
When MOS3, MOS4 are turned under the control of lower metal-oxide-semiconductor driving control signal DL, capacitance C5-C7 and inductance L1 form putting over the ground
Electrical circuit so that output voltage DC_OUT is depressured.
In the embodiment of the present invention, inductance L1 chooses 1.5uH inductance in on-off circuit 20, and C5 is electric using the patch of 22uF/25V
Appearance, C6 and C7 use the electrolytic capacitor of 1000uF/16V, and the parallel combination of this large capacity and low capacity capacitance can effectively improve
Filter effect under high current, reduces output voltage ripple.
Fig. 3 be the present invention can in the DC-DC conversion circuits of dynamic voltage adjustment synchronous buck control circuit 40 an embodiment party
The circuit diagram of formula.As shown in figure 3, synchronous buck control circuit 40 is realized using integrated circuit, such as can use
MAX15026 synchronous bucks controller realizes that it includes feedback voltage pin FB and offset voltage pin COMP, for receiving electricity
Press the feedback voltage and offset voltage that feedback circuit 61 inputs；Driving pin DRV is further included, for receiving the driving of drive circuit
Signal；Further include metal-oxide-semiconductor driving control signal pin DH, lower metal-oxide-semiconductor driving control signal pin DL and switching signal pin
LX, upper metal-oxide-semiconductor driving control signal pin DH are used to export metal-oxide-semiconductor driving control signal DH, in controlling switch circuit 20 on
Metal-oxide-semiconductor turn-on and turn-off, lower metal-oxide-semiconductor driving control signal pin DL are used to export lower metal-oxide-semiconductor driving control signal DL, and control is opened
Lower metal-oxide-semiconductor turn-on and turn-off in powered-down road 20, switching signal pin LX are used for output switching signal LX, the upper and lower metal-oxide-semiconductor of control it
Between switching node conducting circuit.The feedback voltage and benefit that synchronous buck control circuit 40 is inputted according to voltage feedback circuit 61
Upper metal-oxide-semiconductor driving control signal DH, lower metal-oxide-semiconductor driving control signal DL and switching signal LX described in voltage output are repaid, so as to control
The duty cycle of metal-oxide-semiconductor and lower metal-oxide-semiconductor adjusts the desired value that output voltage DC_OUT reaches stable in system.
Fig. 4 is the circuit diagram of an embodiment of voltage feedback circuit 61 in dynamic voltage adjustment module 60 of the present invention.
As shown in figure 4, voltage feedback circuit 61 of the present invention includes resistance R1-R5 and capacitance C8-C12, resistance R1 one end connection resistance R2,
The resistance R2 other ends are grounded, and electricity is connected across after coupling output voltage DC_OUT, capacitance C8 and resistance the R3 series connection of the resistance R1 other ends
The both ends of R1 are hindered, wherein capacitance C8 is connected across one end of resistance R1 connection output voltages DC_OUT, and resistance R3 is connected across resistance R1
Connect one end of resistance R2；One end of resistance R1 connection resistance R2 is sequentially connected in series the other end ground connection of capacitance C9 and C10, C10, electricity
Hold the both ends that capacitance C9 is connected across after C11 and resistance R4 connects, wherein capacitance C11 is connected across the one of capacitance C9 connection resistance R1
End, resistance R4 are connected across one end of capacitance C9 connection capacitances C10, and one end of capacitance C9 connection resistance R1 exports feedback voltage FB,
One end output offset voltage COMP of capacitance C9 connection capacitances C10；Resistance R5 one end is connected across the one of capacitance C9 connection resistance R1
End, that is, export feedback voltage end, and the other end of resistance R5 connects the adjusting voltage DA_OUT that digital voltage regulator circuit 62 exports, at the same time
The other end series capacitance C12, capacitance the C12 other end ground connection of resistance R5.The adjusting voltage DA_ that digital voltage regulator circuit 62 exports
OUT changes, and the feedback voltage for causing to input synchronous buck control circuit 40 accordingly also changes, so that synchronous buck control
Circuit 40 processed can export metal-oxide-semiconductor driving control signal up and down based on the feedback voltage of change, to adjust output voltage DA_OUT.
Fig. 5 is the circuit diagram of an embodiment of digital voltage regulator circuit 62 in dynamic voltage adjustment module 60 of the present invention.
As shown in figure 5, the main composition device of digital voltage regulator circuit 62 is MCU microcontrollers, which contains digital-to-analogue conversion
Device DAC units.Fig. 5 is schematically described by taking 8 MCU microcontrollers as an example, wherein the DAC output pin RC2 couplings of MCU microcontrollers
Output adjusts voltage DA_OUT after meeting a resistance R6, voltage DA_OUT connections voltage feedback circuit 61 is adjusted, to change voltage
The feedback voltage that feedback circuit 61 exports.
In the embodiment of the present invention, resistance R1 and R2 form divider resistance in voltage feedback circuit 61, to output voltage DC_
OUT carries out partial pressure sampling.Meanwhile two-stage resistance is added in voltage feedback circuit 61 and digital voltage regulator circuit 62, connection numeral
The resistance R6 of the DAC output pins of regulating circuit 62 constitutes first order resistance, on the one hand plays the work for adjusting DA_OUT voltages
With low frequency filtering is played the role of in the on the other hand combination with capacitance C12, effectively prevents High-frequency Interference, such as can be 30HZ
Low frequency filtering；The second level electricity group R5 that connection adjusts voltage DA_OUT is regulating resistor, voltage feedback circuit 61 and digital voltage regulation
Circuit 62 is electric to carry out feedback by the combination of divider resistance R1, R2 and increased first order resistance R6, second level resistance R5
The pressure regulation of pressure.In practical applications, fixed first order resistance R6, it is appropriate to adjust second level resistance R5, it can also play adjustment voltage
Effect, frequency filtering do not change.
The series-parallel circuit of capacitance C9, C11 and resistance R4 compositions between feedback voltage FB and offset voltage COMP
Play the role of high frequency feedback, when output voltage DC_OUT needs transient changing, this partial circuit plays timely feedback
Effect, so as to improve the stability and transient response of DC-DC conversion circuits.
The embodiment of the present invention can pass through digital dynamic by the combination of voltage feedback circuit 61 and digital voltage regulator circuit 62
The mode of adjusting exports a certain range of adjusting voltage, and then changes the feedback voltage that voltage feedback circuit 61 exports, and realizes
Dynamically, the effect of the output voltage of DC-DC conversion circuits is accurately adjusted.
Particular embodiments described above, has carried out the purpose of the present invention, technical solution and beneficial effect further in detail
Describe in detail it is bright, it should be understood that the foregoing is merely the present invention specific embodiment, be not intended to limit the invention, it is all
Within the spirit and principles in the present invention, any modification, equivalent substitution, improvement and etc. done, should be included in the guarantor of the present invention
Within the scope of shield.
Claims (12)
1. it is a kind of can dynamic voltage adjustment DC-DC conversion circuits, it is characterised in that including：
Voltage regulation filtering input circuit, for connecting input voltage, voltage stabilizing and filtering are carried out to input voltage；
On-off circuit, for connecting input voltage, by the turn-on and turn-off of switching device come to energy storage filter output circuit into
Row is charged and discharged；
Energy storage filters output circuit, for connecting valve circuit, based on the turn-on and turn-off of switching device in on-off circuit come into
Row is charged and discharged, so as to provide output voltage；
Synchronous buck control circuit, for connecting voltage feedback circuit and on-off circuit, receiving voltage feedback circuit exports anti-
Feedthrough voltage and offset voltage, and according to the driving control signal of the feedback voltage and offset voltage output switch circuit, so that
Controlling switch circuit adjusts output voltage；
Voltage feedback circuit, for connecting output voltage, synchronous buck control circuit and digital voltage regulator circuit, to the synchronous drop
Press control circuit output feedback voltage and offset voltage；
Digital voltage regulator circuit, for connecting voltage feedback circuit, it is anti-to the voltage by digital analog converter DAC units
Current feed circuit output adjusts voltage, to change the feedback voltage.
2. DC-DC conversion circuits according to claim 1, it is characterised in that the voltage feedback circuit includes first, the
2nd, the three, the four, the 5th resistance (R1-R5) and the first, second, third, fourth, the 5th capacitance (C8-C12), first resistor
(R1) one end connection second resistance (R2), second resistance (R2) other end ground connection, the coupling energy storage filter of first resistor (R1) other end
First resistor (R1) is connected across after the output voltage that ripple output circuit provides, the first capacitance (C8) and 3rd resistor (R3) series connection
Both ends, wherein the first capacitance (C8) is connected across one end of first resistor (R1) connection output voltage, 3rd resistor (R3) is connected across
One end of first resistor (R1) connection second resistance (R2)；One end of first resistor (R1) connection second resistance (R2) is sequentially connected in series
Second capacitance (C9) and the 3rd capacitance (C10), the other end ground connection of the 3rd capacitance (C10), the 4th capacitance (C11) and the 4th resistance
(R4) both ends of the second capacitance (C9) are connected across after connecting, wherein the 4th capacitance (C11) is connected across the second capacitance (C9) connection the
One end of one resistance (R1), the 4th resistance (R4) are connected across one end that the second capacitance (C9) connects the 3rd capacitance (C10), the second electricity
Hold one end output feedback voltage of (C9) connection first resistor (R1), the second capacitance (C9) connects one end of the 3rd capacitance (C10)
Export offset voltage；5th resistance (R5) one end connects feedback voltage, the adjusting electricity of other end connection digital voltage regulator circuit output
Pressure, while the other end the 5th capacitance (C12) of series connection of the 5th resistance (R5), the 5th capacitance (C12) other end ground connection.
3. DC-DC conversion circuits according to claim 2, it is characterised in that the digital simulation of the digital voltage regulator circuit
Converter DAC output pins connect the 6th resistance (R6), and the other end of the 6th resistance (R6) exports the adjusting voltage.
4. DC-DC conversion circuits according to claim 1, it is characterised in that the on-off circuit includes a pair of upper metal-oxide-semiconductor
With metal-oxide-semiconductor under a pair, the drain electrode of the pair of upper metal-oxide-semiconductor is connected with sources connected in parallel, the drain electrode of the pair of lower metal-oxide-semiconductor and source electrode
It is connected in parallel, the drain electrode of the pair of upper metal-oxide-semiconductor connects the input voltage, the source electrode connection ground of the pair of lower metal-oxide-semiconductor, institute
The drain electrode for stating the source electrode of metal-oxide-semiconductor and the pair of lower metal-oxide-semiconductor in a pair is connected by switching node.
5. DC-DC conversion circuits according to claim 4, it is characterised in that the grid of the pair of upper metal-oxide-semiconductor connects respectively
Connect metal-oxide-semiconductor driving control signal, the grid of the pair of lower metal-oxide-semiconductor connects lower metal-oxide-semiconductor driving control signal respectively, it is described on
Metal-oxide-semiconductor driving control signal is used for the turn-on and turn-off for controlling the pair of upper metal-oxide-semiconductor, the lower metal-oxide-semiconductor driving control signal
For controlling the turn-on and turn-off of the pair of lower metal-oxide-semiconductor.
6. DC-DC conversion circuits according to claim 5, it is characterised in that the source electrode of the pair of upper metal-oxide-semiconductor and described
Switching node connecting valve signal between the drain electrode of the lower metal-oxide-semiconductor of a pair, the switching signal are used to control the switching node
Conducting circuit.
7. DC-DC conversion circuits according to claim 3, it is characterised in that the digital voltage regulator circuit includes MCU monolithics
Machine, the digital analog converter DAC units are integrated in the MCU microcontrollers.
8. DC-DC conversion circuits according to claim 5, it is characterised in that the synchronous buck control circuit is according to institute
State feedback voltage and offset voltage output upper metal-oxide-semiconductor driving control signal, lower metal-oxide-semiconductor driving control signal and switching signal.
9. DC-DC conversion circuits according to claim 1, it is characterised in that the voltage regulation filtering input circuit is included in
One group of capacitance (C1-C3) being connected in parallel between Input voltage terminal and ground.
10. DC-DC conversion circuits according to claim 9, it is characterised in that the energy storage filtering output circuit includes one
The inductance (L1) of switching node, inductance between the drain electrode of the source electrode and the pair of lower metal-oxide-semiconductor of the pair of upper metal-oxide-semiconductor of end connection
(L1) the other end provides output voltage.
11. DC-DC conversion circuits according to claim 10, it is characterised in that the energy storage filtering output circuit includes
One group of capacitance (C4-C8) being connected in parallel between the other end and ground of inductance (L1).
12. DC-DC conversion circuits according to claim 1, it is characterised in that the DC-DC conversion circuits further include company
Connect the drive circuit of the synchronous buck control circuit.
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| CN201711455399.2A CN108023480A (en) | 2017-12-27 | 2017-12-27 | Can dynamic voltage adjustment DC-DC conversion circuits |
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| CN201711455399.2A CN108023480A (en) | 2017-12-27 | 2017-12-27 | Can dynamic voltage adjustment DC-DC conversion circuits |
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|---|---|---|---|---|
| CN108964461A (en) * | 2018-08-30 | 2018-12-07 | 科大讯飞股份有限公司 | Dynamic voltage adjustment device and method |
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Application publication date: 20180511 |