CN110445356A - A kind of DC-DC converting means and method - Google Patents
A kind of DC-DC converting means and method Download PDFInfo
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- CN110445356A CN110445356A CN201910754214.0A CN201910754214A CN110445356A CN 110445356 A CN110445356 A CN 110445356A CN 201910754214 A CN201910754214 A CN 201910754214A CN 110445356 A CN110445356 A CN 110445356A
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- converting means
- load model
- switch pipe
- upper switch
- enable signal
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/14—Arrangements for reducing ripples from dc input or output
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a kind of DC-DC converting means and methods.Wherein device includes: conducting voltage conversion module, and output is correspondingly connected to one group of driver and upper switch pipe；The conducting voltage conversion module has enable end；Wherein: the load model enable signal by introducing the DC-DC converting means to the enable end enables the conducting voltage conversion module, to provide the independent voltage for driving the upper switch pipe.The present invention is worked using load model enable signal driving conducting voltage conversion module, to reduce the driving voltage of upper switch, is further decreased the loss of upper switch pipe, is improved efficiency.It is improved efficiency due to being the direct driving voltage for reducing upper switch pipe, therefore the turn-on time of upper switch pipe will not increase, therefore input MLCC and output MLCC ripple voltage will not become larger, and MLCC will not be vibrated because of piezoelectric effect, will not generate audible noise.
Description
Technical field
The present invention relates to power technique fields, in particular to a kind of DC-DC converting means and method.
Background technique
Notebook at present, the buck DC-DC for using COT (constant on time duration) control model turn
Parallel operation, input terminal and output end all use MLCC (chip multilayer ceramic capacitor).When converter is in light-load mode, switch
Frequency reduces, and turn-on time can increase, therefore will cause input MLCC and export MLCC ripple voltage and become larger, and MLCC has sufficiently large
Dv/dt variation, MLCC will vibrate because of piezoelectric effect, and then PCB vibration is driven to make a noise, if amplitude is sufficient
After enough reaching the sentient decibel of human ear greatly, audible noise will be generated.
Summary of the invention
The embodiment of the present invention is designed to provide a kind of DC-DC converting means and method, for solving in the prior art
The problem of input MLCC and output MLCC vibrate, cause audible noise when converter works.
In order to solve the above-mentioned technical problem, embodiments herein adopts the technical scheme that a kind of DC-DC transformation dress
It sets, comprising:
Conducting voltage conversion module, output are correspondingly connected to one group of driver and upper switch pipe；
The conducting voltage conversion module has enable end；Wherein:
By introducing the load model enable signal of the DC-DC converting means to the enable end, the conducting is enabled
Voltage transformation module, to provide the independent voltage for driving the upper switch pipe.
Optionally, the conducting voltage conversion module includes switching device and partial pressure device；Wherein:
The driving end of the switching device is configured as the enable end；
The output of the partial pressure device is used to provide the described the voltage for driving the upper switch pipe.
Optionally, further includes: turn-on time transformation module has the load for introducing the DC-DC converting means
The triggering end of pattern enables signal；
By the triggering of the load model enable signal of the DC-DC converting means, the turn-on time transformation module to
The driver output signal, to adjust the upper switch pipe turn-on time.
Optionally, the turn-on time transformation module includes turn-on time generator and timer；Wherein:
The load model enable signal of the DC-DC converting means triggers the turn-on time generator, described in control
Timer is to the driver output signal.
Optionally, described device further include: shift frequency device, the shift frequency device input is the DC-DC converting means
The current value of voltage value and DC-DC converting means, and have the load model for introducing the DC-DC converting means enabled
The triggering end of signal；
By the triggering of the load model enable signal of the DC-DC converting means, the output of the shift frequency device is passed through
Logical process provides predetermined switch frequency range, so that the DC-DC converting means works in the switching frequency range.
Optional described device further includes comparator, and the input terminal of the comparator is the electricity of the DC-DC converting means
Flow valuve and preset current value, output end are used to provide the described load model enable signal.
Optionally, the conducting voltage conversion module is configured as multiple, and the driver and upper switch pipe are led with described
The pressure that is powered conversion module is accordingly configured as multiple groups.
To solve the above problems, a kind of DC-DC transform method is also disclosed in the application, comprising:
According to the operation load model that DC-DC is converted, load model enable signal is generated；
In response to the load model enable signal, upper switch pipe is driven independently with preset voltage value.
Optionally, the method also includes,
In response to the triggering of the load model enable signal, time adjustment signal is exported, to adjust the upper switch pipe
Turn-on time.
Optionally, the method also includes,
By the triggering of the load model enable signal, voltage value and DC-DC based on the DC-DC converting means
The current value of converting means carries out frequency transformation, predetermined switch frequency range is provided by logical process, in the frequency range
Carry out DC-DC transformation.
The beneficial effect of the embodiment of the present invention is: driving conducting voltage conversion module work using load model enable signal
Make, to reduce the driving voltage of upper switch, further decreases the loss of upper switch pipe, improve efficiency.Due to the embodiment of the present invention
It is improved efficiency by directly reducing the driving voltage of upper switch pipe, therefore the turn-on time of upper switch pipe will not increase, therefore
Input MLCC and output MLCC ripple voltage will not become larger, and MLCC will not be vibrated because of piezoelectric effect, will not
Generate audible noise.
Detailed description of the invention
Fig. 1 is the local structural graph of DC-DC converting means in the prior art；
Fig. 2 is the local structural graph of DC-DC of embodiment of the present invention converting means；
Fig. 3 is the local structural graph of DC-DC of embodiment of the present invention converting means；
Fig. 4 is the local structural graph of DC-DC of embodiment of the present invention converting means；
Fig. 5 is the local structural graph of DC-DC of embodiment of the present invention converting means；
Fig. 6 is the flow chart of DC-DC of embodiment of the present invention transform method；
Fig. 7 is the flow chart of DC-DC of embodiment of the present invention transform method.
Specific embodiment
The various schemes and feature of the application are described herein with reference to attached drawing.
It should be understood that various modifications can be made to the embodiment applied herein.Therefore, description above should not regard
To limit, and only as the example of embodiment.Those skilled in the art will expect in the scope and spirit of the present application
Other modifications.
The attached drawing being included in the description and forms part of the description shows embodiments herein, and with it is upper
What face provided is used to explain the application together to substantially description and the detailed description given below to embodiment of the application
Principle.
By the description of the preferred form with reference to the accompanying drawings to the embodiment for being given as non-limiting example, the application's
These and other characteristic will become apparent.
It is also understood that although the application is described referring to some specific examples, those skilled in the art
Member realizes many other equivalents of the application in which can determine, they have feature as claimed in claim and therefore all
In the protection scope defined by whereby.
When read in conjunction with the accompanying drawings, in view of following detailed description, above and other aspect, the feature and advantage of the application will become
It is more readily apparent.
The specific embodiment of the application is described hereinafter with reference to attached drawing；It will be appreciated, however, that applied embodiment is only
Various ways implementation can be used in the example of the application.Known and/or duplicate function and structure and be not described in detail to avoid
Unnecessary or extra details makes the application smudgy.Therefore, applied specific structural and functionality is thin herein
Section is not intended to restrictions, but as just the basis of claim and representative basis be used to instructing those skilled in the art with
Substantially any appropriate detailed construction diversely uses the application.
This specification can be used phrase " in one embodiment ", " in another embodiment ", " in another embodiment
In " or " in other embodiments ", it can be referred to one or more of the identical or different embodiment according to the application.
As shown in Figure 1, being the partial circuit diagram of DC-DC converting means (i.e. converter) in the prior art, no matter convert
Device (converter) is to export identical driving voltage VCC to give operational amplifier D1, and then above to open in what mode
It closes pipe Q1 and driving voltage is provided.And using turn-on time generator TON Generator and edge triggered flip flop TON Timer come
Fixed signal is exported to the end R of trigger 1, and gives operational amplifier D1 by the output of trigger 1, to control upper switch pipe Q1
Turn-on time be a fixed value.One fixed frequency is handled using logic control Control logic simultaneously, is obtained
Fixed switching frequency, and the signal of switching frequency is exported to logical AND gate 2, while utilizing edge triggered flip flop TOFF_MIN
Timer 3 outputs signal to the logical AND gate 2, and exports switch frequency signal to trigger 1 after logical AND gate 2, leads to
It crosses trigger 1 and outputs signal to operational amplifier D1.Wherein, the output end of trigger 1 also with edge triggered flip flop TOFF_
The input terminal connection of the input terminal and edge triggered flip flop TON Timer of MINTimer 3.When trigger output pulse signal and
When for pulse signal being failing edge, the conducting of edge triggered flip flop TOFF_MIN Timer 3 is started to work；When trigger exports pulse
When signal and pulse signal are rising edge, edge triggered flip flop TON Timer conducting is started to work and is worked as, and realizes two edges with this
Trigger can only have one it is in running order.The current value ISENSE of the inside of 4 receiving converter of comparator detecting, will be electric
Flow valuve ISENSE is compared with preset current value Light Load Threshold, to export comparison result to logic sum gate
5, while PFM pulse frequency modulator outputs signal to logic sum gate 5, the output end of logic sum gate 5 outputs signal to logical AND
Door 6, and the signal that trigger 1 exports is received using reverser 7, and signal is exported to logical AND gate 6, logical AND gate 6 is defeated
Turn-on time signal gives operational amplifier D outa, to control lower switch pipe QaTurn-on time be a fixed value.
As shown in Fig. 2, the embodiment of the present invention provides a kind of DC-DC converting means, including conducting voltage conversion module VCC1,
Its output is correspondingly connected to one group of driver D1With upper switch pipe Q1；The conducting voltage conversion module has enable end；Wherein:
By introducing the load model enable signal of the DC-DC converting means to the enable end, the conducting voltage transformation is enabled
Module, to provide the independent voltage for driving the upper switch pipe.
As shown in Fig. 2, the DC-DC converting means of this implementation, the conducting voltage conversion module includes switching device 8 and divides
Voltage device 9；Wherein: the driving end of the switching device 8 is configured as the enable end；The output of the partial pressure device 9 is used for
The voltage of the driving upper switch pipe Q1 is provided.
Input terminal in this implementation using comparator 4 receives the current value of the inside of the DC-DC converting means detecting
Current value ISENSE is compared by ISENSE with preset current value Light Load Threshold, compares knot with output
Fruit gives conducting voltage conversion module.Such as when current value ISENSE is less than preset current value, 4 output loading mode of comparator
Enable end of the enable signal to the switching device 8 in conducting voltage conversion module.Wherein, the preset current value Light
Load Threshold can be determined according to the current value that converting means is under light-load mode.The light-load mode includes non-
Continuous conduction mode or diode simulation model.Wherein, the current value inside the converting means of detecting and converting means are actually defeated
The size of electric current out is identical；Or the value of the current value and converting means actual output current inside the converting means of detecting is deposited
In the relationship of predetermined ratio.
When the internal current value ISENSE of the converting means of detection is less than preset current value Light in the present embodiment
When Load Threshold, i.e., converting means is under light-load mode, enabled using 4 output loading pattern enables signal of comparator
The conducting voltage conversion module, to control upper metal-oxide-semiconductor Q by enabling the conducting voltage conversion module1It disconnects, specifically
, in the present embodiment, conducting voltage conversion module includes: the first partial pressure device 9, and the first partial pressure device 9 includes at least one
For generating the diode of pressure drop, three Diode series form first partial pressure device 9 in the present embodiment.First divider
Part 9 and switching device 8 is in parallel constitutes conducting voltage conversion module, the conducting voltage conversion module also with the second partial pressure device string
Connection, the second partial pressure device include the diode that at least one is used to generate pressure drop, in the present embodiment comprising two poles
Pipe.There are two types of working conditions for conducting voltage conversion module in the present embodiment, and when switching device 8 is connected, three diodes are short
Road (the first partial pressure device is short-circuited), only one diode are depressured (decompression of the second partial pressure device)；When switching device 8 disconnects
When, four diode current flows (the first partial pressure device and the second partial pressure device have pressure drop) have 4 diode drops, pressure drop one
As be 4*0.7V=2.8V.Upper metal-oxide-semiconductor driving voltage is VCC-4Vf, that is, 3V, and the switch driving power Pdriver of upper metal-oxide-semiconductor is about
Equal to=Vgs* { Vgs* (Cgs+Cgd)+Vdd*Cgd } (wherein, Vgs voltage between metal-oxide-semiconductor grid and source electrode；Cgs is grid
The parasitic capacitor between source electrode；Cgd is capacitor parasitic between metal-oxide-semiconductor grid and drain electrode；Vdd is metal-oxide-semiconductor drain electrode and source electrode
Between voltage), when upper metal-oxide-semiconductor driving voltage Vgs is reduced, while (wherein, Qg is total to the Qg (Qg=Cgs+Cgd) of upper metal-oxide-semiconductor
Gate charges capacitance；Cgs parasitic capacitance value between mos gate pole and source electrode；Cgd is parasitic between mos gate pole and drain electrode
Capacitance) it can also reduce, upper metal-oxide-semiconductor drive loss will be reduced, therefore can be improved efficiency.
Since the embodiment of the present invention is improved efficiency by directly reducing the driving voltage of upper switch pipe, upper switch pipe
Turn-on time will not increase, therefore input MLCC and output MLCC ripple voltage will not become larger, MLCC will not be because of piezoelectricity
Effect and vibrate, therefore audible noise will not be generated.At the same time, the present embodiment is also solved due to converting to improve
The light-load efficiency of device, thus PFM pulse frequency modulated is used, therefore turn-on time is caused to increase, input and output MLCC ripple
Voltage becomes larger, thus the problem of cause audible noise.
A kind of DC-DC converting means is provided in another embodiment of the present invention, as shown in Figure 3, comprising: turn-on time transformation mould
Block has the triggering end for introducing the load model enable signal of the DC-DC converting means；Become by the DC-DC
The triggering of the load model enable signal of changing device, the turn-on time transformation module is to the driver output signal, to adjust
The whole upper switch pipe turn-on time.
Specifically, as shown in figure 3, turn-on time transformation module described in the present embodiment includes turn-on time generator TON
Generator and edge triggered flip flop TON Timer.Wherein: the input terminal of the comparator 4 in the DC-DC converting means receives
The DC-DC converting means internal current value ISENSE is obtained specifically, current value ISENSE can be detected by detecting current
.Current value ISENSE is compared with preset current value Light Load Threshold, utilizes the output of comparator 4
End output comparison result.Such as when current value ISENSE is less than preset current value, i.e., converting means is under light-load mode, than
Give turn-on time generator TON Generator compared with 4 output loading pattern enables signal of device so that turn-on time transformation module to
The end the R output signal of trigger 1.In the present embodiment, when converting means enters light-load mode, load model enable signal is utilized
Drive control TON Generator turn-on time generator, so that the turn-on time of turn-on time generator output is normally to lead
The part of logical time.Input capacitance ripple current calculation formula Iripple=Iout { D (1-D) } ^1/2, wherein Iout
It indicates converting means actual output current, has just been set in design transformation device.Reducing turn-on time is exactly to subtract
Few duty ratio D, so as to reduce di/dt and dv/dt on input MLCC；The formula of output capacitance are as follows: Vripple=IL*
ESR=(Vin-Vout) * Ton/L*ESR, in which: Vripple is output ripple voltage；IL is inductance ripple voltage；ESR is electricity
Hold equivalent impedance；Vin is input voltage；Vout is output voltage；Ton is turn-on time；L is inductance value.It can be seen that reducing
Turn-on time Ton just can be reduced the dv/dt on output MLCC；The corresponding ripple voltage for reducing input and output MLCC, reduces
MLCC Oscillation Amplitude reduces MLCC audible noise to realize.
Further embodiment of this invention provides a kind of DC-DC converting means, as shown in Figure 4, comprising: shift frequency device DFA, it is described
The input of shift frequency device is the current value inside voltage value FB and the DC-DC converting means inside the DC-DC converting means
ISENSE has the triggering end for introducing the load model enable signal of the DC-DC converting means；Pass through the DC-
Logical process is passed through in the output of the triggering of the load model enable signal of DC converting means, the DFA, provides predetermined switch frequency
Range, so that the DC-DC converting means works in the frequency range.Wherein shift frequency device DFA is specifically as follows at random
Output signal module or spread spectrum module.Wherein, the voltage value FB inside converting means can be detected by circuit for detecting and be obtained,
It is identical as the voltage value of converting means reality output or there are equal proportion variation relationship.
Builtin voltage and change in the present embodiment in non-light-load mode, using logic controller to the converting means of input
Electric current inside changing device carries out the fixed switching frequency of processing output, so that frequency of the DC-DC converting means work in the fixation
Rate.However when converting means is in light-load mode, then using shift frequency device to inside converting means voltage FB and transformation
Electric current ISENSE inside device is handled and is exported to logic controller, the transformation in final output scheduled frequency range
Switching frequency, so that switching frequency dynamic change in a certain range, for example, output switching frequency is any in 8K~12K
Value.
In the present embodiment, under light-load mode, though reduce turn-on time Ton, under certain load, switching frequency
Fs can be fallen in certain value, can have an opportunity white noise occur, by the way that shift frequency device DFA is arranged, utilize the enabled letter of load model
Number control open DFA, under this certain load, the switching frequency Fs of script make dynamic change, be allowed to not in certain value
On；Such as before opening DFA, converting means works in 10K frequency, and such MLCC vibration frequency is relatively fixed, it is possible that
White noise, but by unlatching DFA, converting means is made to be worked between 8K~12K in any one value in different time points, and
It is not a fixed value, vibration dispersion is opened, so that MLCC vibration distribution is made an uproar in different frequency value to reduce
Sound, especially reduction white noise.
Another embodiment of the present invention provides a kind of DC-DC converting means, as shown in Figure 5, comprising: several electric conduction bucklings
Change the mold block, driver corresponding with each conducting voltage conversion module and upper metal-oxide-semiconductor.Specifically, conducting voltage conversion module
(VCC1-VCCn), output is correspondingly connected to one group of driver (D1-Dn) and upper mos pipe (Q1-Qn)；The conducting voltage transformation
Module has enable end；Wherein: the load model enable signal by introducing the DC-DC converting means to the enable end,
The conducting voltage conversion module is enabled, to provide the independent voltage for driving the upper metal-oxide-semiconductor.
In the present embodiment, each upper metal-oxide-semiconductor is in parallel, and the corresponding upper switch pipe of each conducting voltage conversion module independent control.
By the way that all upper metal-oxide-semiconductors are divided into n group Qn, independently driving driver with n conducting voltage conversion module respectively, (operation is put
Big device) Dn, if VCCn corresponds to Dn, Qn, thus metal-oxide-semiconductor Qn in independent control.Such as it is less than preset electric current in current value ISENSE
When value LightLoad Threshold, i.e., converting means is under light-load mode, and 4 output loading mode of comparator is enabled at this time
Signal controls VCC1-VCCnIn partially ON voltage transformation module work, then work conducting voltage conversion module driving pair
The upper metal-oxide-semiconductor conducting answered, so that a certain number of upper metal-oxide-semiconductor shutdowns improve transformation dress to reduce upper metal-oxide-semiconductor loss
The efficiency set.
The embodiment of the present invention provides a kind of DC-DC transform method, as shown in Figure 6, comprising:
Step S101 generates load model enable signal according to the operation load model that DC-DC is converted；
Step S102 independently drives upper switch pipe in response to the load model enable signal with preset voltage value.
The input terminal of comparator receives the current value ISENSE inside converting means in this implementation, and by current value ISENSE
It is compared with preset current value Light Load Threshold, if current value ISENSE is less than and preset current value
Light Load Threshold determines that converting means is in light-load mode (i.e. discontinuous conduction mode or diode emulation mould
Formula), then utilize the output end output loading pattern enables signal of comparator.Wherein, current value ISENSE can use detecting
Circuit carries out detecting acquisition to converting means.
In the present embodiment by using dynamic driving voltage, to reduce the driving voltage of upper metal-oxide-semiconductor, reduced with this
Metal-oxide-semiconductor switching loss, to improve efficiency.Specifically, can also be worked with drive part upper switch pipe, to control upper switch pipe
Working quantity.And then reduce loss.
On the basis of the present embodiment, the DC-DC transform method further include: in response to the load model enable signal
Triggering, export time adjustment signal, to adjust the upper switch pipe turn-on time.I.e. when entering light-load mode, pass through
The turn-on time of upper switch pipe is reduced to reduce the di/dt and dv/dt on MLCC, to reduce MLCC Oscillation Amplitude, is reduced
Audible noise.
Specifically, the DC-DC transform method further include: by the triggering of the load model enable signal, be based on institute
It states the current value inside the internal voltage value and DC-DC converting means of DC-DC converting means and carries out frequency transformation, by logic
Processing provides predetermined switch frequency range, to carry out DC-DC transformation in the frequency range.
Specifically, the present embodiment provides a kind of DC-DC transform methods, as shown in fig. 7, comprises:
Step 1: detection electric current；
Step 2: judge whether to enter light-load mode by the electric current compared with preset value, if so, step 3 is executed,
If otherwise return step one.Wherein the preset value is the current value under light-load mode.
Step 3: the control of selection dynamic driving voltage change, dynamic turn-on time variation control, the variation of dynamic switch frequency
One or more of control and the variation control of dynamic upper tube working quantity method；
Step 4: adjusting driving voltage accordingly according to the control method of selection, the turn-on time for adjusting upper switch, moving
State adjusts switching frequency and controls the working quantity of upper switch pipe.
The embodiment of the present invention reduces the ripple voltage of input and output MLCC by reducing turn-on time Ton.By using
Dynamic frequency control comes so that switching frequency dynamic mapping in a certain range, to disperse MLCC vibration frequency point, reduction can
Listen noise.By the quantity for combining the driving voltage for reducing upper metal-oxide-semiconductor and reducing metal-oxide-semiconductor in work, come efficiency raising, this programme
DC-DC transform method be can be achieved at the same time under underloading, can reduce MLCC audible noise be able to maintain again and PFM mode under
High efficiency.
Above embodiments are only exemplary embodiment of the present invention, are not used in the limitation present invention, protection scope of the present invention
It is defined by the claims.Those skilled in the art can within the spirit and scope of the present invention make respectively the present invention
Kind modification or equivalent replacement, this modification or equivalent replacement also should be regarded as being within the scope of the present invention.
Claims (10)
1. a kind of DC-DC converting means, comprising:
Conducting voltage conversion module, output are correspondingly connected to one group of driver and upper switch pipe；
The conducting voltage conversion module has enable end；Wherein:
By introducing the load model enable signal of the DC-DC converting means to the enable end, the conducting voltage is enabled
Conversion module, to provide the independent voltage for driving the upper switch pipe.
2. DC-DC converting means according to claim 1, the conducting voltage conversion module includes switching device and partial pressure
Device；Wherein:
The driving end of the switching device is configured as the enable end；
The output of the partial pressure device is used to provide the described the voltage for driving the upper switch pipe.
3. DC-DC converting means according to claim 1, further includes:
Turn-on time transformation module has the triggering for introducing the load model enable signal of the DC-DC converting means
End；
By the triggering of the load model enable signal of the DC-DC converting means, the turn-on time transformation module is to described
Driver output signal, to adjust the upper switch pipe turn-on time.
4. DC-DC converting means according to claim 3, the turn-on time transformation module includes turn-on time generator
And timer；Wherein:
The load model enable signal of the DC-DC converting means triggers the turn-on time generator, to control the timing
Device is to the driver output signal.
5. DC-DC converting means according to claim 1, further includes:
Shift frequency device, the shift frequency device input are the voltage value of the DC-DC converting means and the electricity of DC-DC converting means
Flow valuve, and there is the triggering end for introducing the load model enable signal of the DC-DC converting means；
By the triggering of the load model enable signal of the DC-DC converting means, logic is passed through in the output of the shift frequency device
Processing, provides predetermined switch frequency range, so that the DC-DC converting means works in the switching frequency range.
6. DC-DC converting means according to any one of claim 1 to 5, further includes comparator, the comparator it is defeated
Enter the current value and preset current value that end is the DC-DC converting means, output end, which is used to provide the described load model, to be made
It can signal.
7. DC-DC converting means according to claim 6, the conducting voltage conversion module be configured as it is multiple, it is described
Driver and upper switch pipe and the conducting voltage conversion module are accordingly configured as multiple groups.
8. a kind of DC-DC transform method, comprising:
According to the operation load model that DC-DC is converted, load model enable signal is generated；
In response to the load model enable signal, upper switch pipe is driven independently with preset voltage value.
9. DC-DC transform method according to claim 8, further includes,
In response to the triggering of the load model enable signal, time adjustment signal is exported, to adjust the upper switch pipe conducting
Time.
10. DC-DC transform method according to claim 8, further includes,
By the triggering of the load model enable signal, voltage value and DC-DC transformation based on the DC-DC converting means
The current value of device carries out frequency transformation, provides predetermined switch frequency range by logical process, to carry out in the frequency range
DC-DC transformation.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113452238A (en) * | 2021-07-29 | 2021-09-28 | 富满微电子集团股份有限公司 | Light-load switch control circuit, method and chip |
| CN114138064A (en) * | 2021-10-29 | 2022-03-04 | 广东浪潮智慧计算技术有限公司 | Eliminating device for MLCC squeaking noise and notebook computer |
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