CN106505849A - A kind of controllable linear soft starting circuit of time - Google Patents
A kind of controllable linear soft starting circuit of time Download PDFInfo
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- CN106505849A CN106505849A CN201611210877.9A CN201611210877A CN106505849A CN 106505849 A CN106505849 A CN 106505849A CN 201611210877 A CN201611210877 A CN 201611210877A CN 106505849 A CN106505849 A CN 106505849A
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- 238000004146 energy storage Methods 0.000 claims abstract description 19
- 230000005611 electricity Effects 0.000 claims description 13
- 238000000034 method Methods 0.000 claims description 11
- 230000005669 field effect Effects 0.000 claims description 4
- 230000005540 biological transmission Effects 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 4
- 239000003990 capacitor Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000006641 stabilisation Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000004069 differentiation Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/36—Means for starting or stopping converters
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Electronic Switches (AREA)
- Dc-Dc Converters (AREA)
Abstract
The present invention discloses a kind of controllable linear soft starting circuit of time, the present invention relates to power starting circuit technical field, prior art due to by data segments start exist voltage step formula change and caused high seas gush effect, and its soft-start time arranges circuit complexity, using a large amount of timers, oscillator, there is high cost and design the technical problems such as complexity.The invention mainly comprises power supply regulator circuit, logic judging circuit, linear energy storage device and charging circuit.The present invention is designed for soft start circuit of switch power supply.
Description
Technical field
The present invention relates to power starting circuit technical field, and in particular to a kind of controllable linear soft starting circuit of time.
Background technology
Prior art be using data segments adjust method, soft start voltage staged rise, output voltage is also therewith
There is staged to rise, and the present invention starts the output of voltage and supply voltage adjustment circuit by the way of linear soft start
Voltage is also linear rise, it is achieved that linear soft start-up process.
Content of the invention
For above-mentioned prior art, present invention aim at the linear soft starting circuit that a kind of offer time is controllable, existing
There is the change of voltage step formula and caused high seas gush effect due to starting by data segments in technology, and when input power is deposited
In noise, this effect can further result in holding suddenly for out-put supply before the soft opening time reaches and close suddenly, so as to overall electricity
Road has that reliability is low and the low technical problem of stability；Meanwhile, the soft-start time of prior art arranges circuit complexity, uses
, there is high cost and design the technical problems such as complexity in a large amount of timer, oscillators.
For reaching above-mentioned purpose, the technical solution used in the present invention is as follows：
A kind of controllable linear soft starting circuit of time, including
There is switch in power supply regulator circuit, its passage, for power drives, be provided with the first reference voltage；
Logic judging circuit, is provided with the second reference voltage, the second reference voltage belong to the neighborhood of the first reference voltage or
The first reference voltage of person belongs to the neighborhood of the second reference voltage；
Linear energy storage device, its voltage and the first reference voltage, at least before the switch open of power supply regulator circuit, respectively
The passage inner terminal of the switch of power supply regulator circuit is correspondingly accessed to；
There is in charging circuit, its passage switch, linear energy storage device is charged；
The logic judging circuit, gathers linear energy storage device voltage, by linear energy storage device voltage and second with reference to electricity
The voltage swing relationships synchronization of pressure controls the switch open turned off or on power supply regulator circuit of charging circuit, or
By linear energy storage device voltage and the second reference voltage voltage swing relation control interlocking charging circuit switch close and
The switch open of power supply regulator circuit, realizes that linear boosting or step-down smoothly transit to cut-in voltage.
In such scheme, described power supply regulator circuit, including
First potential point, its voltage are the first reference voltage；
N-channel FET, used as switch, which drains and accesses the first reference voltage；
Amplifier switched output circuits, its amplifier in-phase input end connect the source electrode of N-channel FET, and junction is used as the
Two potential points.
In such scheme, described logic judging circuit, including
Hysteresis loop comparator, the differentiation precision at least with 0.01V, its in-phase input end access the second reference voltage；
Phase inverter, its input connects the output end of hysteresis loop comparator and output end is connected to charging circuit switch and power supply
The control end of adjustment circuit switch.
In such scheme, described charging circuit, including
First current mirroring circuit, receives and refers to constant-current source；
P-channel field-effect transistor (PEFT) pipe, used as switch, reception is exported by the first current mirroring circuit scaled reference constant current ource electric current
Relatively low current and relatively low current is filled with to linear energy storage device；
3rd potential point, the potential point of the voltage identical with linear energy storage device that drained by P-channel field-effect transistor (PEFT) pipe are constituted, and which connects
Be connected to the inverting input of hysteresis loop comparator and the second potential point is connected to also by resistance.
In such scheme, described reference constant-current source, including
Second current mirroring circuit, one branch road are connected with PTAT current circuit, the grid of FET and leakage on the branch road
Pole tension is identical；
3rd current mirroring circuit, one branch road are connected with CTAT current circuit, the grid of FET and leakage on the branch road
Pole tension is identical；
The second described current mirroring circuit and the 3rd current mirroring circuit, its another branch road drain electrode are interconnected as common
Output end, the electric current of output end are to refer to constant-current source.
In such scheme, described linear energy storage device, from or include electric capacity, electric capacity one end the second potential point of connection and
The other end is grounded.
In such scheme, described the second potential point is connected with switch of releasing, and the control end input of switch of releasing has enable
Signal.
A kind of soft-start method for preventing power supply regulator circuit from overshooting, comprises the following steps,
Step 1, the linear boosting of setting or step-down potential point；
Step 2, the first reference point of potential of setting simultaneously arrange switch, then connect switch ends in voltage transmission channel respectively
It is connected to the first reference point of potential and linear boosting or step-down potential point；
Step 3, setting logic judging circuit simultaneously arrange threshold condition according to the first reference point of potential, recycle logic judgment
Linearly boosting or step-down potential point generation voltage linear are changed to threshold condition satisfaction to circuit drives, finally open switch.
In said method, described step 1 comprises the steps
Step 1.1, setting current mirroring circuit, recycle current mirroring circuit scaling one with reference to constant current ource electric current and to export relative
Small current with reference to constant current ource electric current；
Step 1.2, setting one branch switch guiding small current；
Step 1.3, by branch switch guiding small current enter a linear memory device and cause its boost, linear memory device
Voltage constitute the voltage of linear boosted potential point.
In said method, described step 3 comprises the steps
Step 3.1, setting logic judging circuit；
Step 3.2, the magnitude of voltage neighborhood according to the first reference point of potential, arrange the magnitude of voltage of the second reference point of potential, then
Threshold condition is set to magnitude of voltage of the linear boosted potential point voltage more than the second reference point of potential；
Step 3.3, drive linear boosted potential point that voltage linear occurs using logic judging circuit by branch switch to become
Change and meet to threshold condition；
Step 3.4, by logic judging circuit Synchronization Control branch switch close and switch open.
Compared with prior art, beneficial effects of the present invention：
Due to being sufficiently introduced into linear energy storage device, no matter whether input power is reached with the presence of noise in soft-start time
Before, all without opening and closing suddenly because step voltage causes out-put supply to be neglected, overcome prior art output voltage can present synchronous
Staged rises, and easily produces the shortcoming of voltage overshoot；
Digital circuit need not be added, without oscillator and counter, the simpler reliability of structure is particularly suitable for high reliability
Require apparatus field；
Using high-precision quick comparator circuit, the time threshold judgement of soft start is more accurate；
Using precision comparator, when the voltage on charging capacitor reaches certain value, comparator is inverted, soft start
Complete, therefore starting time accurately can set, simultaneously as charging process meets linear changing relation, different by choosing
Soft start charging capacitor, small current, the first reference voltage and the second reference voltage in charging paths, build different degrees of voltage
The potential point of linear change so that switch is smoothly opened in voltage transmission channel, so as to the controllability with starting time and
The flexible setting of soft-start time can be realized；
After matrix current adjustment circuit is opened, the linear energy storage device of the present invention also has filtering and pressure stabilization function, keeps passage
Current stabilization.
Description of the drawings
Fig. 1 is the module diagram of the present invention；
Physical circuit schematic diagrames of the Fig. 2 for the embodiment of the present invention；
Reference constant-current source schematic diagrames of the Fig. 3 for the embodiment of the present invention；
Fig. 4 is prior art soft start waveform diagram.
Specific embodiment
All features disclosed in this specification, or disclosed all methods or during the step of, except mutually exclusive
Feature and/or step beyond, can combine by any way.
The present invention will be further described below in conjunction with the accompanying drawings：
Embodiment 1
Described amplifier switched output circuits, including amplifier, power switch and divider resistance；Amplifier in-phase input end connects
Connect the grid of power switch, electricity to potential point B, the intermediate potential point of inverting input connection divider resistance and amplifier output end
Source VCC connects divider resistance by power switch, and using divider resistance maximum potential point as the output end of power supply regulator circuit.
FET in all current mirroring circuits can be preferably the FET of P-channel.The structure of the first reference point of potential, can be with
The triode that can be connected for resistance and resistance by power supply VCC connection loads, load or FET, the highest electricity of load
Site is used as the first reference point of potential.
Reference constant-current source in Fig. 3 is the temperature independent reference current with degree of precision, through N:1 current mirror
Picture, makes the electric current reduce certain multiple, forms low current charge branch road, and the precision of the electric current can affect the essence of soft-start time
Degree, in actual use, on the basis of Fig. 3, is embodied as situation in conjunction with Fig. 2, then separately arranges a current mirror, this electricity
Mirror is flowed by reference current source IoutChange to reference to constant-current source Iref, it is obtained in that more preferable currents match characteristic.
ENB signals control a nmos switch, control for the enable to the functional module, and as ENB=0, the module is being just
Often work, as ENB=1, the soft start function of the module can be made to fail.
Before soft start is completed, linear rise when B point voltages follow C point voltages reaches 1.15V's until changing voltage
Comparator turn threshold, N1 switches are opened, and A point voltages reach B points, then B point voltages will just be changed into 1.2V, and soft start is completed.
It is noted that a condition：Reference voltage 1>Reference voltage 2, in physical circuit, that mark is VREF1=1.2V,
VREF2=1.15V, two voltages need closely, can so avoid carrying out VREF1 near judgment threshold and VREF2 cuts
Produce step to rise when changing.
PTAT current：The current source of positive temperature coefficient；
CTAT current：The current source of negative temperature coefficient；
Two electric current superpositions, can produce temperature independent reference current source.
By embodiment 1, another kind of embodiment of the easy reasonable construction present invention, linear energy storage device need to be full of in advance
Electricity (or can also be charged by charging circuit, but integrated circuit volume can be increased), charging circuit no longer can be set and
Replaced with current sink circuit (current sink), the input of comparator can correspondingly be replaced with and meet discharge threshold condition
Input structure, this kind of embodiment be applied to the particular electrical circuit of linear voltage decreasing process time, and the opening time is relatively short.
The above, the only specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, any
Belong to those skilled in the art the invention discloses technical scope in, the change or replacement that can readily occur in all are answered
It is included within the scope of the present invention.
Claims (10)
1. controllable linear soft starting circuit of a kind of time, it is characterised in that include
Power supply regulator circuit, for power drives, is provided with the first reference voltage；
Logic judging circuit, is provided with the second reference voltage, and the second reference voltage belongs to the neighborhood of the first reference voltage or
One reference voltage belongs to the neighborhood of the second reference voltage；
Linear energy storage device, its voltage and the first reference voltage, correspondingly access to the passage of the switch of power supply regulator circuit respectively
Inner terminal；
Charging circuit, charges to linear energy storage device；
Wherein, the logic judging circuit, gathers linear energy storage device voltage, by linear energy storage device voltage and second with reference to electricity
The voltage swing relationships synchronization of pressure controls the switch open turned off or on power supply regulator circuit of charging circuit, or
By linear energy storage device voltage and the second reference voltage voltage swing relation control interlocking charging circuit switch close and
The switch open of power supply regulator circuit.
2. controllable linear soft starting circuit of a kind of time according to claim 1, it is characterised in that described power supply is adjusted
Whole circuit, including
First potential point (A), its voltage are the first reference voltage；
N-channel FET, its drain and access the first reference voltage；
Amplifier switched output circuits, its amplifier in-phase input end connect the source electrode of N-channel FET, and junction is used as the second electricity
Site (B).
3. controllable linear soft starting circuit of a kind of time according to claim 1 and 2, it is characterised in that described patrols
Decision circuitry is collected, including
Hysteresis loop comparator, its in-phase input end access the second reference voltage；
Phase inverter, the output end and output end of its input connection hysteresis loop comparator are connected to charging circuit switch and power supply adjustment
The control end of contactor.
4. a kind of controllable linear soft starting circuit of time according to claim 3, it is characterised in that described charging electricity
Road, including
First current mirroring circuit, receives and refers to constant-current source；
P-channel field-effect transistor (PEFT) pipe, receive relatively low current for being exported by the first current mirroring circuit scaled reference constant current ource electric current and
Relatively low current is filled with to linear energy storage device；
3rd potential point (C), the potential point of the voltage identical with linear energy storage device that drained by P-channel field-effect transistor (PEFT) pipe are constituted, and which connects
Be connected to the inverting input of hysteresis loop comparator and the second potential point (B) is connected to also by resistance.
5. controllable linear soft starting circuit of a kind of time according to claim 4, it is characterised in that described reference is permanent
Stream source, including
Second current mirroring circuit, one branch road are connected with PTAT current circuit, the grid of FET and drain electrode electricity on the branch road
Pressure is identical；
3rd current mirroring circuit, one branch road are connected with CTAT current circuit, the grid of FET and drain electrode electricity on the branch road
Pressure is identical；
The second described current mirroring circuit and the 3rd current mirroring circuit, its another branch road drain electrode are interconnected as common output
End, the electric current of output end is to refer to constant-current source.
6. a kind of controllable linear soft starting circuit of time according to claim 5, it is characterised in that described linear storage
Energy device, selects or including electric capacity, and electric capacity one end connects the second potential point (B) and other end ground connection.
7. a kind of controllable linear soft starting circuit of time according to claim 2, it is characterised in that the second described electricity
Site (B), is connected with switch of releasing, and the control end input of switch of releasing has enable signal.
8. controllable linear soft-start method of a kind of time, it is characterised in that comprise the following steps,
Step 1, the linear boosting of setting or step-down potential point；
Step 2, the first reference point of potential of setting simultaneously arrange switch, then be connected to switch ends in voltage transmission channel respectively
First reference point of potential and linear boosting or step-down potential point；
Step 3, setting logic judging circuit simultaneously arrange threshold condition according to the first reference point of potential, recycle logic judging circuit
Drive linear boosting or step-down potential point that voltage linear occurs and be changed to threshold condition satisfaction, finally open switch.
9. a kind of controllable linear soft-start method of time according to claim 8, it is characterised in that described step 1,
Comprise the steps
Step 1.1, setting current mirroring circuit, recycle current mirroring circuit scaling one with reference to constant current ource electric current and to export relative reference
The small current of constant current ource electric current；
Step 1.2, setting one branch switch guiding small current；
Step 1.3, by branch switch guiding small current enter a linear memory device and cause its boost, the electricity of linear memory device
Pressure constitutes the voltage of linear boosted potential point.
10. a kind of controllable linear soft-start method of time according to claim 9, it is characterised in that described step
3, comprise the steps
Step 3.1, setting logic judging circuit；
Step 3.2, the magnitude of voltage neighborhood according to the first reference point of potential, arrange the magnitude of voltage of the second reference point of potential, then by threshold
Value condition setting is magnitude of voltage of the linear boosted potential point voltage more than the second reference point of potential；
Step 3.3, drive linear boosted potential point that voltage linear occurs using logic judging circuit by branch switch to be changed to
Threshold condition meets；
Step 3.4, by logic judging circuit Synchronization Control branch switch close and switch open.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201611210877.9A CN106505849A (en) | 2016-12-24 | 2016-12-24 | A kind of controllable linear soft starting circuit of time |
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| CN201611210877.9A CN106505849A (en) | 2016-12-24 | 2016-12-24 | A kind of controllable linear soft starting circuit of time |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108599565A (en) * | 2018-04-26 | 2018-09-28 | 苏州大贝岩电子科技有限公司 | A kind of stereo garage power circuit special based on MEMS sensor |
| CN108768151A (en) * | 2018-04-26 | 2018-11-06 | 高路生 | A kind of stereo garage power circuit special |
| CN109039047A (en) * | 2018-06-07 | 2018-12-18 | 苏州华兴源创科技股份有限公司 | A kind of device and method of digital regulated soft startup of electric power time |
| CN113162386A (en) * | 2021-03-05 | 2021-07-23 | 广州大学 | Reference voltage soft start circuit suitable for boost conversion circuit |
| CN113270997A (en) * | 2021-06-07 | 2021-08-17 | 浙江精英电器有限公司 | Progressive control method and control circuit for surge steps of inverter |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108599565A (en) * | 2018-04-26 | 2018-09-28 | 苏州大贝岩电子科技有限公司 | A kind of stereo garage power circuit special based on MEMS sensor |
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| CN113270997A (en) * | 2021-06-07 | 2021-08-17 | 浙江精英电器有限公司 | Progressive control method and control circuit for surge steps of inverter |
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Effective date of registration: 20200312 Address after: Room 705, block a, No. 159, Chengjiang Middle Road, Jiangyin City, Wuxi City, Jiangsu Province Applicant after: Jiangyin yuanlingxinkuang Microelectronics Technology Co., Ltd Address before: West high tech Zone Fucheng Road in Chengdu city of Sichuan province 610000 399 No. 7 Building 3 unit 9 Building No. 905 Applicant before: Chengdu zhuochuang Microelectronics Co. Ltd. |