CN108336905A - A kind of DC-DC circuit - Google Patents
A kind of DC-DC circuit Download PDFInfo
- Publication number
- CN108336905A CN108336905A CN201711140586.1A CN201711140586A CN108336905A CN 108336905 A CN108336905 A CN 108336905A CN 201711140586 A CN201711140586 A CN 201711140586A CN 108336905 A CN108336905 A CN 108336905A
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- China
- Prior art keywords
- voltage
- signal
- terminal
- power supplies
- switching power
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- 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
- H02M1/14—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
- H02M3/06—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider
Abstract
The present invention relates to switch power technology fields, and in particular to a kind of DC DC circuits, including, an Input voltage terminal；One output voltage terminal；Input voltage terminal and one first reference mode is controllably connected under the effect of one first drive signal in first switch branch；The first reference mode and ground terminal is controllably connected under the effect of one second drive signal in second switch branch；Energy-storage travelling wave tube, the alternately charge or discharge in circuit work；PWM signal generation unit is compared a sampling from the first voltage feedback signal of output voltage terminal and a voltage comparison signal and generates the first drive signal and the second drive signal；Voltage comparison signal is generated by an error amplifier, and error amplifier is used to after carrying out operation with a reference voltage from the second voltage feedback signal of output voltage terminal to a feedback generate.The present invention can improve the stability of COT switching circuits work, reduce the ripple of COT output voltages.
Description
Technical field
The present invention relates to switch power technology fields, and in particular to a kind of DC-DC circuit.
Background technology
DC-DC Switching Power Supplies can be generally divided into voltage-mode, current-mode there are many control model according to sampled signal.Electricity
Pressing mold carries out negative-feedback by sampling and outputting voltage, and current-mode carries out negative-feedback by sampling input current and output voltage；Often
Include with electric current mould bases structure：Peak Current Mode (Peak-Current Mode), average current mould (Average-Current
) and hysteresis current mould (Hysteretic-Current Mode) Mode；Divide including pulsewidth modulation according to duty ratio modulation mode
(Pulse Width Modulation, PWM), pulse frequency modulated (Pulse Frequency Modulation, PFM) are permanent
Determine turn-on time pattern (Constant On Time, COT), fixes turn-off time pattern (Fixed Off Time, FOT), late
Stagnant control (Bang-Bang) isotype.
As shown in Figure 1, being traditional COT mode circuit figures, response speed quickly, but needs to generate with ESR resistor
Voltage ripple with inductive current same-phase is to stablize loop, for occasion minimum this kind of ESR of ceramic condenser, stability ratio
It is more difficult.
Invention content
In order to solve the above technical problems, the present invention is intended to provide a kind of DC-DC circuit, specifically includes,
One Input voltage terminal (VIN)；
One output voltage terminal (VOUT)；
The Input voltage terminal is controllably connected under the effect of one first drive signal (HS) in first switch branch
(VIN) and one first reference mode (X0)；
First reference mode is controllably connected under the effect of one second drive signal (LS) in second switch branch
(X0) and the ground terminal (GND)；
Energy-storage travelling wave tube (OLB) is connected between first reference mode (X0) and the output voltage terminal (VOUT), in
Alternately charge or discharge in circuit work；
PWM signal generation unit is sampled to one from the first voltage feedback signal (FB_S) of the output voltage terminal and one
Voltage comparison signal (LPF), which is compared, generates first drive signal (HS) and second drive signal (LS)；
The voltage comparison signal (LPF) is generated by an error amplifier (OPA1), the error amplifier (OPA1)
For carrying out operation with a reference voltage (VREF) from the second voltage feedback signal (FB) of the output voltage terminal to a feedback
After generate.
The DC-DC Switching Power Supplies of the present invention, the PWM signal generation unit include：
The in-phase input end of one comparator (PWMCOMP), the comparator (PWMCOMP) connects the voltage comparison signal
(LPF), the inverting input of the comparator (PWMCOMP) connects the first voltage feedback signal (FB_S), the comparison
Device (PWMCOMP) is produced for being compared to the voltage comparison signal (LPF) and the first voltage feedback signal (FB_S)
Raw comparison pulse signal；
One signal driving unit (PWM DRV), connect with the comparator (PWMCOMP), for the comparator
(PWMCOMP) signal exported generates first drive signal (HS) and second drive signal (LS) after being handled.
The DC-DC Switching Power Supplies of the present invention, the first voltage feedback signal (FB_S) divide branch by a first resistor
Road generates, and the first resistor partial pressure branch includes predetermined quantity and is connected in series with each other in the output voltage terminal (VOUT)
First group of divider resistance between ground terminal (GND), the dot being connected between first group of divider resistance at divider node,
The first voltage feedback signal (FB_S) is drawn from scheduled first divider node.
The DC-DC Switching Power Supplies of the present invention, the second voltage feedback signal (FB) divide branch by a second resistance
Generate, second resistance partial pressure branch include predetermined quantity and be connected in series with each other in the output voltage terminal (VOUT) with
Second group of divider resistance between ground terminal (GND), the dot being connected between second group of divider resistance is at divider node, institute
Second voltage feedback signal (FB) is stated to draw from scheduled second divider node.
The DC-DC Switching Power Supplies of the present invention, connect between first divider node and the output voltage terminal (VOUT)
One first capacitance (C0).
The DC-DC Switching Power Supplies of the present invention, one is connected between the output voltage terminal (VOUT) and the ground terminal (GND)
ESR resistor and with the concatenated output capacitance of the ESR resistor (COUT).
The DC-DC Switching Power Supplies of the present invention, connect between second divider node and the output voltage terminal (VOUT)
One second capacitance (C2).
The DC-DC Switching Power Supplies of the present invention, in-phase input end connection second electricity of the error amplifier (OPA1)
Feedback signal (FB), the inverting input of the error amplifier (OPA1) is pressed to connect the reference voltage (VREF).
The DC-DC Switching Power Supplies of the present invention, connect between the output end and ground terminal (GND) of the error amplifier (OPA1)
Connect a third capacitance (CF).
The DC-DC Switching Power Supplies of the present invention, connection load electricity between the output voltage terminal (VOUT) and ground terminal (GND)
It hinders (Rload).
Advantageous effect：Error amplifier can improve COT and open for generating voltage comparison signal all the way for increase of the present invention
The stability of powered-down road work, reduces the ripple of COT output voltages.
Description of the drawings
Fig. 1 is the circuit structure diagram of the COT patterns of the prior art；
Fig. 2 is the circuit structure diagram of the present invention.
Specific implementation mode
Lower section will combine the attached drawing in the embodiment of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation describes, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art obtained under the premise of not making creative work it is all its
His embodiment, shall fall within the protection scope of the present invention.
It should be noted that in the absence of conflict, the feature in embodiment and embodiment in the present invention can phase
Mutually combination.
Below with the drawings and specific embodiments, the invention will be further described, but not as limiting to the invention.
With reference to Fig. 2, a kind of DC-DC circuit specifically includes,
One Input voltage terminal (VIN)；
One output voltage terminal (VOUT)；
First switch branch, in one first drive signal (HS) effect under be controllably connected Input voltage terminal (VIN) and
One first reference mode (X0)；
Second switch branch, in one second drive signal (LS) effect under be controllably connected the first reference mode (X0) and
Ground terminal (GND)；
Energy-storage travelling wave tube (OLB) is connected between the first reference mode (X0) and output voltage terminal (VOUT), is worked in circuit
Middle alternately charge or discharge；
PWM signal generation unit is sampled to one from the first voltage feedback signal (FB_S) of output voltage terminal and a voltage
Comparison signal (LPF), which is compared, generates the first drive signal (HS) and the second drive signal (LS)；
Voltage comparison signal (LPF) is generated by an error amplifier (OPA1), and error amplifier (OPA1) is used for one
It feeds back and is generated after carrying out operation with a reference voltage (VREF) from the second voltage feedback signal (FB) of output voltage terminal.
The present invention is based on the DC-DC circuit of basic type COT frameworks, increase outer voltage control targe voltage all the way, it can be with
The stability of switching circuit work is improved, the ripple of COT output voltages is reduced.
In conjunction with Fig. 1 and Fig. 2, former inner ring loop, i.e. first voltage feedback signal are improved to arbitrary electric resistance partial pressure and obtain, for
Ceramic condenser can also realize the equivalent ESR of 100Mohm or more even if the ESR capacitances of 10Mohm by electric resistance partial pressure, to
System is allowed to be easier design stability.
The DC-DC Switching Power Supplies of the present invention, PWM signal generation unit include：
One comparator (PWMCOMP), the in-phase input end connection voltage comparison signal (LPF) of comparator (PWMCOMP), than
Compared with the inverting input connection first voltage feedback signal (FB_S) of device (PWMCOMP), comparator (PWMCOMP) is used for voltage
Comparison signal (LPF) and first voltage feedback signal (FB_S) are compared, and generate comparison pulse signal；
One signal driving unit (PWM DRV), connect with comparator (PWMCOMP), for defeated to comparator (PWMCOMP)
The signal gone out generates the first drive signal (HS) and the second drive signal (LS) after being handled.
The DC-DC Switching Power Supplies of the present invention, first voltage feedback signal (FB_S) divide branch by a first resistor and produce
Raw, first resistor partial pressure branch includes predetermined quantity and is connected in series with each other in output voltage terminal (VOUT) and ground terminal
(GND) first group of divider resistance between, the dot being connected between first group of divider resistance is at divider node, first voltage feedback
Signal (FB_S) is drawn from scheduled first divider node.
The DC-DC Switching Power Supplies of the present invention, second voltage feedback signal (FB) divide branch by a second resistance and generate,
Second resistance partial pressure branch include predetermined quantity and be connected in series with each other in output voltage terminal (VOUT) and ground terminal (GND) it
Between second group of divider resistance, the dot being connected between second group of divider resistance is at divider node, second voltage feedback signal
(FB) it is drawn from scheduled second divider node.
The DC-DC Switching Power Supplies of the present invention, an ESR resistor is connected between output voltage terminal (VOUT) and ground terminal (GND)
And with the concatenated output capacitance of ESR resistor (COUT).
The in-phase input end of the DC-DC Switching Power Supplies of the present invention, error amplifier (OPA1) connects second voltage feedback letter
Number (FB), the inverting input connection reference voltage (VREF) of error amplifier (OPA1).
The DC-DC Switching Power Supplies of the present invention, one is connected between the output end and ground terminal (GND) of error amplifier (OPA1)
Third capacitance (CF).
The DC-DC Switching Power Supplies of the present invention, load resistance is connected between output voltage terminal (VOUT) and ground terminal (GND)
(Rload)。
A kind of preferred embodiment, above-mentioned first group of divider resistance include resistance R0 and resistance R1, resistance R0 and resistance
R1 is serially connected, and the resistance ratios of resistance R0 and resistance R1 can arbitrarily be set；Second group of divider resistance includes resistance R5 and electricity
Resistance R4, resistance R5 and resistance R4 are serially connected.
A kind of preferred embodiment, above-mentioned first switch branch include a PMOS tube (M1), the grid of PMOS tube (M1)
The first drive signal (HS) is connected, source electrode connects Input voltage terminal (VIN), and drain electrode the first reference mode of connection (X0), second opens
It includes a NMOS tube (M0) to close branch, and the grid of NMOS tube (M0) connects the second drive signal (LS), and source level connects ground terminal
(GND), drain electrode the first reference mode of connection (X0).
The circuit of one group of electric resistance partial pressure is only set compared with the prior art, and the present invention increases by one group of resistor voltage divider circuit, increases
Error amplifier is added, lower voltage can be arbitrarily arranged in this second resistance partial pressure branch, such as is set as 1/16, can
With 16 times of the equivalent amplification of ESR, error amplifier ensures the precision of entire circuit, and comparator (PWMCOMP) is for accelerating to ring
It answers speed and stablizes loop.
A kind of preferred embodiment,
The DC-DC Switching Power Supplies of the present invention connect one first electricity between the first divider node and output voltage terminal (VOUT)
Hold (C0).
The DC-DC Switching Power Supplies of the present invention connect one second electricity between the second divider node and output voltage terminal (VOUT)
Hold (C2).
Shunt-wound capacitance on divider resistance, the first capacitance of setting (C0) are less than resistance R0 in the impedance of switching frequency point, and/or
Second capacitance (C2) is less than resistance R5 in the impedance of switching frequency point, can significantly improve AC signal, while not influencing straight
Flow voltage stabilizing.Break frequency is located at about the 1/10 of switching frequency, when switching frequency is 500kHz, is anticipated for RC units
Taste the cutoff frequency of 50kHz.Due to C=1/2 π RF, when R1 is equal to 3k Ω, it is about 1 that capacitance, which can be calculated,
000pF.Therefore the AC regeneration signal of 4 times of increase can be obtained, theoretically ESR can should be reduced 4 times.
A kind of preferred embodiment, can also include the second error amplifier, second error amplifier it is same mutually defeated
Enter one TEMPCO signals of end connection, inverting input connects a benchmark VO signals；Further, further include third error amplification
The in-phase input end of device, the third error amplifier connects an XXX_OTHER signals, one benchmark V1 letters of inverting input connection
Number.For in parallel with error amplifier, realization temperature control, constant current effect.
It these are only preferred embodiments of the present invention, be not intended to limit the implementation manners and the protection scope of the present invention, it is right
For those skilled in the art, it should can appreciate that and all be replaced with being equal made by description of the invention and diagramatic content
It changes and obviously changes obtained scheme, should all be included within the scope of the present invention.
Claims (10)
1. a kind of DC-DC circuit, which is characterized in that including,
One Input voltage terminal (VIN)；
One output voltage terminal (VOUT)；
First switch branch, in one first drive signal (HS) effect under be controllably connected the Input voltage terminal (VIN) and
One first reference mode (X0)；
Second switch branch, in one second drive signal (LS) effect under be controllably connected first reference mode (X0) and
The ground terminal (GND)；
Energy-storage travelling wave tube (OLB) is connected between first reference mode (X0) and the output voltage terminal (VOUT), in circuit
Replace charge or discharge in work；
PWM signal generation unit is sampled to one from the first voltage feedback signal (FB_S) of the output voltage terminal and a voltage
Comparison signal (LPF), which is compared, generates first drive signal (HS) and second drive signal (LS)；
The voltage comparison signal (LPF) is generated by an error amplifier (OPA1), and the error amplifier (OPA1) is used for
It is produced after carrying out operation with a reference voltage (VREF) from the second voltage feedback signal (FB) of the output voltage terminal to a feedback
It is raw.
2. DC-DC Switching Power Supplies according to claim 1, which is characterized in that the PWM signal generation unit includes：
The in-phase input end of one comparator (PWMCOMP), the comparator (PWMCOMP) connects the voltage comparison signal
(LPF), the inverting input of the comparator (PWMCOMP) connects the first voltage feedback signal (FB_S), the comparison
Device (PWMCOMP) is produced for being compared to the voltage comparison signal (LPF) and the first voltage feedback signal (FB_S)
Raw comparison pulse signal；
One signal driving unit (PWM DRV), connect with the comparator (PWMCOMP), for the comparator
(PWMCOMP) signal exported generates first drive signal (HS) and second drive signal (LS) after being handled.
3. DC-DC Switching Power Supplies according to claim 1, which is characterized in that the first voltage feedback signal (FB_S)
By a first resistor branch is divided to generate, first resistor partial pressure branch include predetermined quantity and be connected in series with each other in
First group of divider resistance between the output voltage terminal (VOUT) and ground terminal (GND), phase between first group of divider resistance
The dot of connection is drawn at divider node, the first voltage feedback signal (FB_S) from scheduled first divider node.
4. DC-DC Switching Power Supplies according to claim 1, which is characterized in that the second voltage feedback signal (FB) is logical
It crosses second resistance partial pressure branch to generate, the second resistance partial pressure branch includes predetermined quantity and is connected in series with each other in institute
Second group of divider resistance between output voltage terminal (VOUT) and ground terminal (GND) is stated, is connected between second group of divider resistance
The dot connect is drawn at divider node, the second voltage feedback signal (FB) from scheduled second divider node.
5. DC-DC Switching Power Supplies according to claim 3, which is characterized in that first divider node and the output
One first capacitance (C0) is connected between voltage end (VOUT).
6. DC-DC Switching Power Supplies according to claim 1, which is characterized in that the output voltage terminal (VOUT) and described
Connected between ground terminal (GND) ESR resistor and with the concatenated output capacitance of the ESR resistor (COUT).
7. DC-DC Switching Power Supplies according to claim 4, which is characterized in that second divider node and the output
One second capacitance (C2) is connected between voltage end (VOUT).
8. DC-DC Switching Power Supplies according to claim 4, which is characterized in that the same phase of the error amplifier (OPA1)
Input terminal connects the second voltage feedback signal (FB), and the inverting input of the error amplifier (OPA1) connects the base
Quasi- voltage (VREF).
9. DC-DC Switching Power Supplies according to claim 1, which is characterized in that the output of the error amplifier (OPA1)
A third capacitance (CF) is connected between end and ground terminal (GND).
10. DC-DC Switching Power Supplies according to claim 1, which is characterized in that the output voltage terminal (VOUT) and ground connection
Connection load resistance (Rload) between end (GND).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711140586.1A CN108336905B (en) | 2017-11-16 | 2017-11-16 | DC-DC circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711140586.1A CN108336905B (en) | 2017-11-16 | 2017-11-16 | DC-DC circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108336905A true CN108336905A (en) | 2018-07-27 |
| CN108336905B CN108336905B (en) | 2020-12-04 |
Family
ID=62922864
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711140586.1A Active CN108336905B (en) | 2017-11-16 | 2017-11-16 | DC-DC circuit |
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| Country | Link |
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| CN (1) | CN108336905B (en) |
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| CN109149938A (en) * | 2018-08-30 | 2019-01-04 | 上海芯导电子科技有限公司 | A kind of DC-DC circuit |
| CN109861527A (en) * | 2019-04-02 | 2019-06-07 | 无锡职业技术学院 | A kind of switch power supply system based on lag mode control |
| CN110299843A (en) * | 2019-06-14 | 2019-10-01 | 上海芯导电子科技有限公司 | A kind of composite DC/DC circuit |
| CN110417262A (en) * | 2019-06-28 | 2019-11-05 | 上海芯导电子科技有限公司 | A kind of loop compensation circuit |
| CN114337281A (en) * | 2021-12-28 | 2022-04-12 | Oppo广东移动通信有限公司 | Voltage control circuit and method based on COT (chip on Board) architecture and power supply equipment |
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| CN105048808A (en) * | 2015-08-25 | 2015-11-11 | 华为技术有限公司 | Voltage conversion circuit, method and polyphase parallel power supply system |
| CN105978337A (en) * | 2016-06-22 | 2016-09-28 | 电子科技大学 | COT control mode based offset voltage canceling circuit |
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| CN109149938A (en) * | 2018-08-30 | 2019-01-04 | 上海芯导电子科技有限公司 | A kind of DC-DC circuit |
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| CN110299843A (en) * | 2019-06-14 | 2019-10-01 | 上海芯导电子科技有限公司 | A kind of composite DC/DC circuit |
| CN110417262A (en) * | 2019-06-28 | 2019-11-05 | 上海芯导电子科技有限公司 | A kind of loop compensation circuit |
| CN114337281A (en) * | 2021-12-28 | 2022-04-12 | Oppo广东移动通信有限公司 | Voltage control circuit and method based on COT (chip on Board) architecture and power supply equipment |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108336905B (en) | 2020-12-04 |
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