CN105991023B - A kind of self-oscillation DC-DC circuit with fast response characteristic - Google Patents
A kind of self-oscillation DC-DC circuit with fast response characteristic Download PDFInfo
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Abstract
The self-oscillation DC-DC circuit with fast response characteristic that the invention discloses a kind of, the source electrode of metal-oxide-semiconductor M1 is connect with DC power supply Vin, the first input end of its drain electrode, the drain electrode of metal-oxide-semiconductor M2 and triangular wave generating circuit is connect with one end of energy storage inductor L1, and the grid of grid and metal-oxide-semiconductor M2 are connect with two output ends of switch driver respectively；The source electrode of metal-oxide-semiconductor M2 with dock；The other end of energy storage inductor L1 respectively with the anode of storage capacitor C1, the second input terminal of triangular wave generating circuit, error amplifier source signal input terminal and load connect, the cathode of storage capacitor C1 with dock；The output end of triangular wave generating circuit and the source signal input terminal of comparison circuit connect；Two window signal input terminals of comparison circuit are connect with two window signal output ends of error amplifier respectively, the input terminal connection of output end and switch driver.The present invention has the characteristics that structure is simple, self-oscillation, compares certainly, gain is low, fast response time, small power consumption, electromagnetic interference are low.
Description
Technical field
The present invention relates to electronic circuit fields, more particularly to a kind of self-oscillation DC-DC electricity with fast response characteristic
Road.
Background technique
DC/DC circuit is a kind of switching power circuit, utilizes the energy storage characteristic of capacitor and inductance, passes through controllable switch
(such as MOSFET) carries out the movement of HF switch, and it is inner that the electric energy of input is stored in capacitor (sense), when the switches are opened, electric energy
It is released to load again, provides energy for load.The ability of power or voltage that DC/DC circuit is exported is related with duty ratio, accounts for
Sky is than the ratio for switch conduction times and the period entirely switched.
As shown in FIG. 1, FIG. 1 is traditional buck DC-DC circuit, this kind of DC-DC circuit generally has several as follows ask
Topic:
(1) in traditional DC-DC circuit, diode rectification is generallyd use, and the forward conduction voltage drop of diode is larger,
A large amount of loss occurs in switching process.For the transfer efficiency for improving DC-DC, the loss of DC-DC circuit is reduced, it can be according to synchronization
Commutation technique replaces rectifier diode using the extremely low power MOSFET of on state resistance.
Since the two switch metal-oxide-semiconductors generally use same control signal, the phenomenon that easily simultaneously turning on, cause a large amount of
Power loss.
(2) in traditional DC-DC circuit, it usually needs using oscillator come output clock pulse signal and other same frequencies
Signal, this undoubtedly increases the package area of chip occupancy, increases chip cost, while will also result in certain power damage
Consumption.
(3) structure is complicated for traditional DC-DC circuit, in circuit integration, can occupy biggish package area, increase chip
Cost of manufacture.
(4) in power supply design, transient response speed and conversion efficiency are all crucial technical indicators.As shown in Figure 1 this
The advantages of kind converter is that efficiency is very high, but response speed is slower, on the one hand, inductive current rise/fall slope is limited by defeated
Enter output voltage, cannot quickly change output electric current under transient state step, on the other hand, the loop bandwidth of switch converters is general
It lower than 1/5th of switching frequency, is limited by switching frequency, the loop response time is long.
(5) traditional DC-DC circuit power consumption height, low efficiency, electromagnetic interference EMI high, some are also configured with EMI processing mould
Block.
Summary of the invention
It is an object of the invention to overcome the deficiencies of the prior art and provide a kind of self-oscillations with fast response characteristic
DC-DC circuit, self-oscillation, without additional configuration oscillator is small power consumption, high-efficient, and electromagnetic interference EMI is low, handles mould without EMI
Block, circuit structure is simple, and package area is small, and chip cost is low.
The purpose of the present invention is achieved through the following technical solutions: a kind of self-oscillation with fast response characteristic
DC-DC circuit, it includes switch driver, switch metal-oxide-semiconductor M1, switch metal-oxide-semiconductor M2, energy storage inductor L1, storage capacitor C1, three
Angle wave generative circuit, error amplifying circuit and comparison circuit.
The source electrode of the switch metal-oxide-semiconductor M1 is connect with DC power supply Vin, switchs drain electrode, the switch metal-oxide-semiconductor of metal-oxide-semiconductor M1
The drain electrode of M2 and the first input end of triangular wave generating circuit are connect with one end of energy storage inductor L1, switch the grid of metal-oxide-semiconductor M1
Pole and the grid for switching metal-oxide-semiconductor M2 are connect with the first output end and second output terminal of switch driver respectively, switch metal-oxide-semiconductor M2
Source electrode with dock, the other end of energy storage inductor L1 respectively with the anode of storage capacitor C1, triangular wave generating circuit second
Input terminal, error amplifying circuit source signal input terminal and load connection, the cathode of storage capacitor C1 with dock.
The output end of the triangular wave generating circuit and the source signal input terminal of comparison circuit connect, and triangular wave generates electricity
Road is used to generate triangular signal V according to the voltage at the both ends energy storage inductor L1FB_RC。
Two window signal input terminals of the comparison circuit are defeated with two window signals of error amplifying circuit respectively
Outlet connection, the output end of comparison circuit and the input terminal of switch driver connect, and comparison circuit is used for triangular signal
VFB_RCIt is dynamic for control switch metal-oxide-semiconductor M1 and switch metal-oxide-semiconductor M2 switch to switch driver output after being compared with window signal
The switching signal of work.
The reference voltage input and reference voltage V of the error amplifying circuitREFConnection, the two of error amplifying circuit
A window signal output end includes high threshold voltage WIN_HIOutput end and low threshold voltage WIN_LOOutput end, error amplifying circuit
For amplifying reference voltage VREFWith the error of the output voltage Vout of DC-DC circuit, and its output window signal with DC-
The fluctuation of the output voltage Vout of DC circuit and fluctuate.
The switch driver is non-overlapping by non-overlapping clock generating module output two-way according to the switching signal
Clock control signal carries out switch motion to distinguish control switch metal-oxide-semiconductor M1 and switch metal-oxide-semiconductor M2.
The triangular wave generating circuit includes resistance R1 and filter capacitor C2, one end of the resistance R1 and energy storage inductor
The input terminal of L1 connects, and the other end of resistance R1 connects with the source signal input terminal of the negative terminal of filter capacitor C2 and comparison circuit respectively
It connects, the anode of filter capacitor C2 is connect with the output end of energy storage inductor L1.
The comparison circuit includes first comparator COMP1, the second comparator COMP2 and rest-set flip-flop, and described first
The high threshold voltage W of the non-inverting input terminal of comparator COMP1 i.e. window signal input terminal and error amplifying circuitIN_HIEven
It connects, the non-inverting input terminal of the inverting input terminal of first comparator COMP1 and the second comparator COMP2 are and triangular wave generating circuit
Output end connection, the input terminal R connection of the output end and rest-set flip-flop of first comparator COMP1, the second comparator COMP2's
The inverting input terminal i.e. low threshold voltage W of another window signal input and error amplifying circuitIN_LOConnection, the second comparator
The input terminal S connection of the output end and rest-set flip-flop of COMP2, the input terminal of an output end and switch driver of rest-set flip-flop
Connection.
The error amplifying circuit includes error amplifier EA1, the inverting input terminal of the error amplifier EA1 with
The source signal input terminal of error amplifying circuit connects, the non-inverting input terminal of error amplifier EA1 and the benchmark of error amplifying circuit
Voltage input end connection, the high threshold voltage W of error amplifier EA1IN_HIOne window signal of output end and comparison circuit is defeated
Enter end connection, the low threshold voltage W of error amplifier EA1IN_LOAnother of output end and comparison circuit window signal input terminal
Connection.
The beneficial effects of the present invention are:
1) present invention passes through triangular wave generating circuit and comparison circuit carries out self-oscillation processing, vibrates without additional configuration
Device, small power consumption, high-efficient, fast response time.
2) electromagnetic interference caused by switch metal-oxide-semiconductor and energy storage inductor is effectively reduced in the present invention, at additional configuration EMI
Manage module.
3) comparison circuit in the present invention is by triangular signal VFB_RCRatio is done with the error amplification signal of DC-DC output voltage
Compared with, compared with itself, error amplifier output window voltage WIN_LOAnd WIN_HIIt is with DC-DC output voltage Vout
Variation and change, so the switching signal that rest-set flip-flop continuously exports also can be by low and high level according to certain duty ratio
The pulse signal being composed, required gain is low, and response speed is faster, more efficient, so that DC-DC output voltage Vout is more
Precisely.
4) switch driver in the present invention exports the non-overlapping clock control signal of two-way, to distinguish control switch metal-oxide-semiconductor
M1 and switch metal-oxide-semiconductor M2 carry out switch motion, can effectively avoid the phenomenon that switch metal-oxide-semiconductor simultaneously turns on, and avoid big
The power loss of amount.
5) circuit structure of the present invention is simple, and package area is small, and chip cost is low, and stability is good, and has centainly removable
Plant property.
Detailed description of the invention
Fig. 1 is traditional buck DC-DC circuit structure schematic diagram；
Fig. 2 is self-oscillation DC-DC circuit functional block diagram of the present invention；
Fig. 3 is self-oscillation DC-DC circuit schematic diagram of the present invention；
Fig. 4 is self-oscillation DC-DC circuit transient response schematic diagram of the present invention；
Response schematic diagram when Fig. 5 is self-oscillation DC-DC circuit Fast transforms of the present invention.
Specific embodiment
Technical solution of the present invention is described in further detail with reference to the accompanying drawing, but protection scope of the present invention is not limited to
It is as described below.
As shown in Fig. 2, a kind of self-oscillation DC-DC circuit with fast response characteristic, it includes switch driver, switch
Metal-oxide-semiconductor M1, switch metal-oxide-semiconductor M2, energy storage inductor L1, storage capacitor C1, triangular wave generating circuit, error amplifying circuit and comparison are electric
Road.
In the present invention, PMOS tube is can be selected in switch metal-oxide-semiconductor M1, and NMOS tube can be selected in switch metal-oxide-semiconductor M2.
The source electrode of the switch metal-oxide-semiconductor M1 is connect with DC power supply Vin, switchs drain electrode, the switch metal-oxide-semiconductor of metal-oxide-semiconductor M1
The drain electrode of M2 and the first input end of triangular wave generating circuit are connect with one end of energy storage inductor L1, switch the grid of metal-oxide-semiconductor M1
Pole and the grid for switching metal-oxide-semiconductor M2 are connect with the first output end and second output terminal of switch driver respectively, switch metal-oxide-semiconductor M2
Source electrode with dock, the other end of energy storage inductor L1 respectively with the anode of storage capacitor C1, triangular wave generating circuit second
Input terminal, error amplifying circuit source signal input terminal connected with the power input of load, the cathode of storage capacitor C1 and ground
Docking.
The output end of the triangular wave generating circuit and the source signal input terminal of comparison circuit connect, and triangular wave generates electricity
Road is used to generate triangular signal V according to the voltage at the both ends energy storage inductor L1FB_RC。
Two window signal input terminals of the comparison circuit are defeated with two window signals of error amplifying circuit respectively
Outlet connection, the output end of comparison circuit and the input terminal of switch driver connect, and comparison circuit is used for triangular signal
VFB_RCIt is dynamic for control switch metal-oxide-semiconductor M1 and switch metal-oxide-semiconductor M2 switch to switch driver output after being compared with window signal
The switching signal of work.
The reference voltage input and reference voltage V of the error amplifying circuitREFConnection, the two of error amplifying circuit
A window signal output end includes high threshold voltage WIN_HIOutput end and low threshold voltage WIN_LOOutput end, error amplifying circuit
For amplifying reference voltage VREFWith the error of the output voltage Vout of DC-DC circuit, and its output window signal with DC-
The fluctuation of the output voltage Vout of DC circuit and fluctuate.
The switch driver is non-overlapping by non-overlapping clock generating module output two-way according to the switching signal
Clock control signal carries out switch motion to distinguish control switch metal-oxide-semiconductor M1 and switch metal-oxide-semiconductor M2.
It switchs metal-oxide-semiconductor M1 and switchs the clock control signal that metal-oxide-semiconductor M2 is inputted according to respective grid respectively, according to corresponding
Frequency does voltage transformation to DC power supply Vin, then by energy storage inductor L1 and storage capacitor C1 to the direct current after voltage transformation
Voltage regulation filtering is carried out, finally output expectation voltage.
As shown in figure 3, the triangular wave generating circuit includes resistance R1 and filter capacitor C2, one end of the resistance R1
It is connect with the input terminal of energy storage inductor L1, the other end of resistance R1 is believed with the source of the negative terminal of filter capacitor C2 and comparison circuit respectively
The anode of the connection of number input terminal, filter capacitor C2 connect with the output end of energy storage inductor L1, the output end of energy storage inductor L1 with bear
Carry resistance R2 connection.
The comparison circuit includes window voltage comparator and rest-set flip-flop, and the window voltage comparator can also be named
Double-limit comparator is done, it can detecte its input voltage VFB_RCWhether between two given threshold value voltages.
There are two threshold voltages, i.e. high threshold reference voltage W for window voltage comparatorIN_HIWith Low threshold reference voltage
WIN_LO.High threshold reference voltage WIN_HIWith Low threshold reference voltage WIN_LOPressure difference and DC-DC circuit output voltage Vout
Fluctuate related, i.e., its pressure difference is smaller, and Vout output pulsation is smaller, ignores the limit of storage capacitor C1 and energy storage inductor L1 size at this time
System.
The window voltage comparator includes first comparator COMP1 and the second comparator COMP2, and the comparison is electric
Road includes first comparator COMP1, the second comparator COMP2 and rest-set flip-flop, and the first of the first comparator COMP1 is defeated
Enter end to connect with a window signal input terminal, the of the second input terminal of first comparator COMP1 and the second comparator COMP2
One input terminal is connect with the output end of triangular wave generating circuit, and the of the output end of first comparator COMP1 and rest-set flip-flop
The connection of one input terminal, the second input terminal of the second comparator COMP2 are connect with another window signal input terminal, the second comparator
Second input terminal of the output end of COMP2 and rest-set flip-flop connects, the first output end of rest-set flip-flop and switch driver it is defeated
Enter end connection, the second output terminal sky of rest-set flip-flop connects.
The error amplifying circuit includes error amplifier EA1, the inverting input terminal of the error amplifier EA1 with
The source signal input terminal of error amplifying circuit connects, the non-inverting input terminal of error amplifier EA1 and the benchmark of error amplifying circuit
Voltage input end connection, the high threshold voltage W of error amplifier EA1IN_HIOne window signal of output end and comparison circuit is defeated
Enter end connection, the low threshold voltage W of error amplifier EA1IN_LOAnother of output end and comparison circuit window signal input terminal
Connection.
In the present invention, triangular wave generating circuit is used to generate triangular signal according to the voltage at the both ends energy storage inductor L1
VFB_RC, realize the self-oscillation of DC-DC circuit；Error amplifying circuit is for amplifying reference voltage VREFWith the output electricity of DC-DC circuit
The error of Vout is pressed, and the window signal of its output is fluctuated with the fluctuation of the output voltage Vout of DC-DC circuit；Compare electric
Road is used for triangular signal VFB_RCWindow voltage with error amplifying circuit output compares, and exports and controls to switch driver
The switching signal that switch metal-oxide-semiconductor M1 and switch metal-oxide-semiconductor M2 are cut-off.
As shown in figure 4, the self-oscillation working principle of DC-DC circuit of the present invention:
S1, as voltage VFB_RCLess than Low threshold reference voltage WIN_LOWhen, switch metal-oxide-semiconductor M1 conducting, switch metal-oxide-semiconductor M2 is closed
Disconnected, energy storage inductor L1 starts to fill energy, the output voltage V of triangular wave generating circuitFB_RCStart linear (being similar to linear) rising；
S2, as voltage VFB_RCRise above high threshold reference voltage WIN_HIWhen, switch metal-oxide-semiconductor M1 shutdown, switch MOS
Pipe M2 conducting, the output voltage V of triangular wave generating circuitFB_RCStart linear (being similar to linear) decline；
S3, as voltage VFB_RCDrop to less than Low threshold reference voltage WIN_LOWhen, switch metal-oxide-semiconductor M1 conducting, switch MOS
Pipe M2 shutdown, energy storage inductor L1 start to fill energy, the output voltage V of triangular wave generating circuit againFB_RCStart linear rise again；
Repeat the above steps S1~S3, can accurately export desired DC voltage Vout.
In the present invention, reference voltage VREFDetermine window voltage WIN_LOAnd WIN_HIThe size of value, window voltage WIN_LOWith
WIN_HIValue determine DC-DC circuit output voltage Vout size, and the pressure differential deltap V of window voltageWINDC- is determined again
The precision of DC circuit output voltage Vout, the pressure differential deltap V of window voltageWINIt is smaller, the precision of DC-DC circuit output voltage Vout
It is higher.
As shown in figure 5, another important feature of the invention is: window voltage WIN_LOAnd WIN_HIIt is with DC-DC electricity
The variation of the output voltage Vout on road and change so that DC-DC circuit of the present invention it is exportable more accurately meet it is desired
Voltage, but also DC-DC circuit can make fast reaction to transient response.
When DC-DC circuit output voltage Vout occur transient changing when, error amplifying circuit output window voltage with
Vout occur transient changing, triangular signal VFB_RCAlways in window voltage WIN_LOAnd WIN_HIBetween press certain slope variation,
Change the duty ratio of switching signal, so that the on-off frequency corresponding change of switch metal-oxide-semiconductor M1 and switch metal-oxide-semiconductor M2, thus rapidly
Change the output voltage Vout of DC-DC circuit to adapt to load, effectively improves the response speed of DC-DC circuit.
In the present invention, the specific connection types of comparison circuit internal components can there are many, as long as being able to achieve above-mentioned function
Scheme can be carried out application.
Embodiment one:
The non-inverting input terminal of first comparator COMP1 i.e. its first input end and high threshold reference voltage WIN_HIConnection, the
The inverting input terminal of the one comparator COMP1 i.e. non-inverting input terminal of its second input terminal and the second comparator COMP2 i.e. its first
Input terminal is connect with the output end of triangular wave generating circuit, the input of the output end and rest-set flip-flop of first comparator COMP1
R i.e. its first input end is held to connect, the inverting input terminal of the second comparator COMP2 i.e. its second input terminal and Low threshold benchmark electricity
Press WIN_LOConnection, the output end of the second comparator COMP2 and input terminal S i.e. its second input terminal of rest-set flip-flop connect, RS touching
Send out the output end of deviceI.e. the input terminal of its first output end and switch driver connects, the output end Q of rest-set flip-flop i.e. its
Two output end skies connect.
The logical equation of basic RS filpflop are as follows:When the rest-set flip-flop in the present invention selects NAND gate
When the rest-set flip-flop of composition, constraint equation are as follows: SR=0.Such as by the output end of rest-set flip-flopWith the input of switch driver
End connection, the output end Q sky of rest-set flip-flop connect.
The relationship of its four kinds of inputs and output is obtained according to above-mentioned two formula:
1, when the end R is effectively low level 0, and the end S is high level 1 in vain, then Q=0,
2, when it is effectively low level 0 that the end R is high level 1, the end S in vain, then Q=1,
3, when the end RS is high level 1 in vain, the state of trigger is remained unchanged；
4, when the end RS is effectively low level 0, the state of trigger is uncertain.
Working principle of the present invention is as follows:
1) initially, the voltage on energy storage inductor L1 is 0V, the output voltage V of triangular wave generating circuitFB_RCIt also is 0V, this
When, VFB_RC< WIN_LO< WIN_HI, first comparator COMP1 output high level, the end trigger R is invalid, the second comparator COMP2
Low level is exported, the end trigger S is effective, then trigger output endExport low level, two output ends of switch driver
V1 and V2 exports low level, switch metal-oxide-semiconductor M1 conducting, and switch metal-oxide-semiconductor M2 is turned off, and energy storage inductor L1 starts to fill energy, triangular wave
The output voltage V of generative circuitFB_RCStart linear (being similar to linear) rising.
It 2) is the power loss for avoiding DC power supply Vin, the non-overlapping clock generating module in switch driver exists
After receiving low level signal, two-way non-overlapping clock control signal V1 and V2 are generated, so that switch metal-oxide-semiconductor M2 is first closed,
Switch metal-oxide-semiconductor M1 is connected again.
3) work as WIN_LO< VFB_RC< WIN_HIWhen, first comparator COMP1 exports high level, and the end trigger R is invalid, and second
Comparator COMP2 exports high level, and the end trigger S is invalid, then trigger keeps standing state constant, and switch metal-oxide-semiconductor M1 continues
Conducting, switch metal-oxide-semiconductor M2 are persistently turned off, and energy storage inductor L1 continues to fill energy, the output voltage V of triangular wave generating circuitFB_RCAlso it holds
It is continuous to rise.
4) work as WIN_LO< WIN_HI< VFB_RCWhen, first comparator COMP1 exports low level, and the end trigger R is effective, and second
Comparator COMP2 exports high level, and the end trigger S is invalid, then trigger output endHigh level is exported, switch driver
Two output ends V1 and V2 export high level, and switch metal-oxide-semiconductor M1 is disconnected, switch metal-oxide-semiconductor M2 conducting, and energy storage inductor L1 is from ground terminal
Extracting energy, and start exoergic, the output voltage V of triangular wave generating circuitFB_RCStart linear decline.
5) when the output voltage of triangular wave generating circuit drops to: WIN_LO< VFB_RC< WIN_HIWhen, first comparator
COMP1 exports high level, and the end trigger R is invalid, and the second comparator COMP2 exports high level, and the end trigger S is invalid, then triggers
Device keeps standing state constant, and switch metal-oxide-semiconductor M1 is continuously turned off, and switchs metal-oxide-semiconductor M2 constant conduction, energy storage inductor L1 type discharge
Can, the output voltage V of triangular wave generating circuitFB_RCContinue to decline.
6) when the output voltage of triangular wave generating circuit drops to: VFB_RC< WIN_LO< WIN_HIWhen, first comparator
COMP1 exports high level, and the end trigger R is invalid, and the second comparator COMP2 exports low level, and the end trigger S is effective, then triggers
Device output endLow level is exported, two output end V1 and V2 of switch driver export low level again, switch metal-oxide-semiconductor M1
Conducting, switch metal-oxide-semiconductor M2 shutdown, energy storage inductor L1 start to fill energy, the output voltage V of triangular wave generating circuit againFB_RCStart again
Rise.
Self-oscillation DC-DC circuit of the present invention repeats the above-mentioned course of work, accurately exports desired direct current Vout.
Embodiment two:
Embodiment two and embodiment one the difference is that: the output end of the second comparator COMP2 and rest-set flip-flop
Input terminal R connection, the input terminal S connection of the output end and rest-set flip-flop of first comparator COMP1, the output end Q of rest-set flip-flop
It is connect with the input terminal of switch driver, the output end of rest-set flip-flopSky connects.That is, window voltage comparator, triangular wave
The connection relationship and connecting terminal of generative circuit and switch driver all do not change, and only overturn rest-set flip-flop, then divide
It is not connected with window voltage comparator with switch driver.The working principle of embodiment two is similarly it is found that details are not described herein.
Due to the internal resistance very little of PMOS tube, for resistance R1, internal resistance is negligible, triangular wave generating circuit
Output voltage VFB_RCRate of rise slopeupCalculation formula are as follows:
In formula, the output voltage of Vin- DC power supply；
VOUTThe voltage of DC-DC circuit output.
The output voltage V of triangular wave generating circuitFB_RCDescending slope slopedownCalculation formula are as follows:
In formula, VGNDGround terminal voltage, generally 0V.
By the rate of rise and the calculation formula of descending slope it is found that triangular signal VFB_RCThe rate of rise and descending slope
Related with the output voltage Vout of DC-DC circuit, triangular wave generating circuit is true according to the output voltage Vout of DC-DC circuit itself
Determine triangular signal VFB_RCSlope, comparison circuit is further according to triangular signal VFB_RCSlope adjust its output switch
Signal square wave, so that DC-DC circuit exports desired value.
The window voltage W of error amplifier outputIN_HIAnd WIN_LOThe reference voltage V inputted with itREFIt is defeated with DC-DC circuit
Relationship between voltage Vout out, shown in following calculation formula:
VWIN_HI=VREF-Av(VREF-VOUT)+ΔVWIN/2
VWIN_LO=VREF-Av(VREF-VOUT)-ΔVWIN/2
In formula, Av-error amplifier amplification factor；
ΔVWINThe pressure difference of-window voltage, i.e. Δ VWIN=VWIN_HI-VWIN_LO。
By the window voltage calculation formula of error amplifier output it is found that the window voltage W of error amplifier outputIN_HIWith
WIN_LOIt is related with DC-DC output voltage Vout, the window voltage W of error amplifier outputIN_LOAnd WIN_HIIt is as DC-DC is defeated
Out the variation of voltage Vout and change.
In conclusion triangular wave generating circuit is to determine triangular wave according to the output voltage Vout of DC-DC circuit itself
Signal VFB_RCSlope；The window voltage W of error amplifier outputIN_LOAnd WIN_HIIt is also with DC-DC output voltage Vout's
Change and changes；Comparison circuit will triangular signal V related with itself output voltage VoutFB_RCWith itself output voltage Vout
Related window voltage is compared, and exports the related switch combined according to certain duty ratio with itself output voltage Vout
Signal；Switch driver is according to switching signal control switch metal-oxide-semiconductor M1 and the on-off for switching metal-oxide-semiconductor M2, so that DC- of the present invention
DC circuit, which exports rapidly, more accurately meets desired DC voltage Vout.
Claims (1)
1. a kind of self-oscillation DC-DC circuit with fast response characteristic, it is characterised in that: it includes switch driver, switch
Metal-oxide-semiconductor M1, switch metal-oxide-semiconductor M2, energy storage inductor L1, storage capacitor C1, triangular wave generating circuit, error amplifying circuit and comparison are electric
Road；
The source electrode of the switch metal-oxide-semiconductor M1 is connect with DC power supply Vin, is switched the drain electrode of metal-oxide-semiconductor M1, is switched metal-oxide-semiconductor M2's
Drain electrode and the first input end of triangular wave generating circuit connects with one end of energy storage inductor L1, the grid of switch metal-oxide-semiconductor M1 with
The grid of switch metal-oxide-semiconductor M2 is connect with the first output end and second output terminal of switch driver respectively, switchs the source of metal-oxide-semiconductor M2
Pole with dock, the other end of energy storage inductor L1 respectively with the anode of storage capacitor C1, triangular wave generating circuit second input
End, error amplifying circuit source signal input terminal and load connection, the cathode of storage capacitor C1 with dock；
The output end of the triangular wave generating circuit and the source signal input terminal of comparison circuit connect, and triangular wave generating circuit is used
According to the voltage at the both ends energy storage inductor L1 generation triangular signal VFB_RC；
Two window signal input terminals of the comparison circuit respectively with two window signal output ends of error amplifying circuit
Connection, the output end of comparison circuit and the input terminal of switch driver connect, and comparison circuit is used for triangular signal VFB_RC
After comparing with window signal, for control switch metal-oxide-semiconductor M1 and metal-oxide-semiconductor M2 switch motion is switched to switch driver output
Switching signal；
The reference voltage input of the error amplifying circuit is connect with reference voltage VREF, and error amplifying circuit is for amplifying
The error of reference voltage VREF and the output voltage Vout of DC-DC circuit, and the window signal of its output is with DC-DC circuit
The fluctuation of output voltage Vout and fluctuate；
The switch driver exports the non-overlapping clock of two-way by non-overlapping clock generating module according to the switching signal
Signal is controlled, carries out switch motion to distinguish control switch metal-oxide-semiconductor M1 and switch metal-oxide-semiconductor M2；
The triangular wave generating circuit includes one end and the energy storage inductor L1 of resistance R1 and filter capacitor C2, the resistance R1
One end connection, the other end of resistance R1 are connect with the source signal input terminal of the negative terminal of filter capacitor C2 and comparison circuit respectively, are filtered
The anode of wave capacitor C2 is connect with the other end of energy storage inductor L1；
The comparison circuit includes first comparator COMP1, the second comparator COMP2 and rest-set flip-flop, and described first compares
The first input end of device COMP1 is connect with a window signal input terminal, the second input terminal of first comparator COMP1 and second
The first input end of comparator COMP2 is connect with the output end of triangular wave generating circuit, the output end of first comparator COMP1
It is connect with the first input end of rest-set flip-flop, the second input terminal of the second comparator COMP2 and another window signal input terminal
Second input terminal of connection, the output end of the second comparator COMP2 and rest-set flip-flop connects, the first output end of rest-set flip-flop with
The input terminal of switch driver connects, and the second output terminal sky of rest-set flip-flop connects；
The error amplifying circuit includes error amplifier EA1, the inverting input terminal and error of the error amplifier EA1
The source signal input terminal of amplifying circuit connects, the non-inverting input terminal of error amplifier EA1 and the reference voltage of error amplifying circuit
Input terminal connection, the high threshold voltage WIN_HI output end of error amplifier EA1 and a window signal of comparison circuit input
End connection, the low threshold voltage WIN_LO output end of error amplifier EA1 and another window signal input terminal of comparison circuit
Connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510066848.9A CN105991023B (en) | 2015-02-09 | 2015-02-09 | A kind of self-oscillation DC-DC circuit with fast response characteristic |
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| CN107026568B (en) * | 2017-05-19 | 2020-04-10 | 矽力杰半导体技术(杭州)有限公司 | Control circuit, control method and switching power supply |
| CN112018839B (en) * | 2020-07-29 | 2022-06-24 | 上海芯导电子科技股份有限公司 | Load detection circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103227566A (en) * | 2013-04-22 | 2013-07-31 | 华为技术有限公司 | DC-DC converter |
| CN103956896A (en) * | 2013-03-29 | 2014-07-30 | 成都芯源系统有限公司 | Voltage conversion circuit and control method |
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| JP2007074190A (en) * | 2005-09-06 | 2007-03-22 | Rohm Co Ltd | Triangular wave generating circuit, pulse width modulator using the same, and switching regulator |
| JP2009303382A (en) * | 2008-06-13 | 2009-12-24 | Nec Electronics Corp | Triangular-wave generating circuit and switching regulator |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103956896A (en) * | 2013-03-29 | 2014-07-30 | 成都芯源系统有限公司 | Voltage conversion circuit and control method |
| CN103227566A (en) * | 2013-04-22 | 2013-07-31 | 华为技术有限公司 | DC-DC converter |
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