CN206517296U - 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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- CN206517296U CN206517296U CN201621428907.9U CN201621428907U CN206517296U CN 206517296 U CN206517296 U CN 206517296U CN 201621428907 U CN201621428907 U CN 201621428907U CN 206517296 U CN206517296 U CN 206517296U
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Abstract
The utility model discloses a kind of controllable linear soft starting circuit of time, and the utility model is related to power starting circuit technical field, including 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 neighborhood or the first reference voltage that the second reference voltage belongs to the first reference voltage belong to the neighborhood of the second reference voltage；Linear energy storage device, its voltage and the first reference voltage, correspond to the passage inner terminal for the switch for accessing to power supply regulator circuit respectively；Charging circuit, charges to linear energy storage device；High seas gush effect caused by the utility model solves prior art due to there is the change of voltage step formula by data segments startup, and its soft-start time sets circuit complicated, using a large amount of timers, oscillator, there is the technical problem such as cost height and design complexity.
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 is the method adjusted using data segments, and soft start voltage staged rises, and 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.
The content of the invention
It is existing present invention aims at the linear soft starting circuit that a kind of offer time is controllable for above-mentioned prior art
Technology gushes effect due to there are high seas caused by voltage step formula changes by data segments startup, and when input power is deposited
In noise, this effect can be further resulted in reached in the soft opening time before neglecting for out-put supply hold and close suddenly so that overall electricity
Road has that reliability is low and the low technical problem of stability；Meanwhile, the soft-start time of prior art sets circuit complicated, uses
, there is the technical problem such as cost height and design complexity in a large amount of timer, oscillators.
To reach above-mentioned purpose, the technical solution adopted by 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, the first reference voltage is provided with；
Logic judging circuit, is provided with the second reference voltage, the second reference voltage belong to the first reference voltage neighborhood or
The reference voltage of person first 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 of power supply regulator circuit is opened, respectively
Correspondence accesses to the passage inner terminal of the switch of power supply regulator circuit；
There is switch in charging circuit, its passage, 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 switch unlatching turned off or on power supply regulator circuit of the voltage swing relationships synchronization control charging circuit of pressure, or
By linear energy storage device voltage and the second reference voltage voltage swing relation control interlocking charging circuit switch close and
The switch of power supply regulator circuit is opened, and realizes that linear boosting or decompression smoothly transit to cut-in voltage.
In such scheme, described power supply regulator circuit, including
First potential point, its voltage is the first reference voltage；
N-channel FET, is used as switch, its first reference voltage of access that drains；
Amplifier switched output circuits, its amplifier in-phase input end connects 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 accesses 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, reception refers to constant-current source；
P-channel field-effect transistor (PEFT) pipe, as switch, receives what 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, is made up of, it connects the potential point of P-channel field-effect transistor (PEFT) pipe drain electrode voltage identical with linear energy storage device
It is connected to the inverting input of hysteresis loop comparator and the second potential point is also connected to by resistance.
In such scheme, described reference constant-current source, including
Second current mirroring circuit, one branch road is 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 is connected with CTAT current circuit, the grid of FET and leakage on the branch road
Pole tension is identical；
Described the second current mirroring circuit and the 3rd current mirroring circuit, its another branch road drain electrode is interconnected as jointly
Output end, the electric current of output end is to refer to constant-current source.
In such scheme, described linear energy storage device, including electric capacity, electric capacity one end connects the second potential point and the other end
Ground connection.
In such scheme, the second described potential point is connected with switch of releasing, and the control end input for switch of releasing has enable
Signal.
A kind of soft-start method for being used to prevent that power supply regulator circuit from overshooting, comprises the following steps,
Step 1, the linear boosting of setting or decompression potential point；
Step 2, set the first reference point of potential that switch is simultaneously set in voltage transmission channel, then respectively connect switch ends
It is connected to the first reference point of potential and linear boosting or decompression potential point；
Step 3, setting logic judging circuit simultaneously set threshold condition according to the first reference point of potential, recycle logic judgment
Linearly boosting or decompression potential point generation voltage linear are changed to threshold condition satisfaction to circuit drives, finally open switch.
In the above method, described step 1 comprises the following steps
Step 1.1, setting current mirroring circuit, recycle current mirroring circuit scaling one simultaneously to be exported relatively with reference to constant current ource electric current
With reference to the low current of constant current ource electric current；
Step 1.2, one branch switch of setting guide low current；
Step 1.3, entered by branch switch guiding low current and a linear memory device and cause it to boost, linear memory device
Voltage constitute the voltage of linear boosted potential point.
In the above method, described step 3 comprises the following steps
Step 3.1, setting logic judging circuit；
Step 3.2, the magnitude of voltage neighborhood according to the first reference point of potential, set the magnitude of voltage of the second reference point of potential, then
Threshold condition is set to the magnitude of voltage that linear boosted potential point voltage is more than the second reference point of potential；
Step 3.3, drive linear boosted potential point to occur voltage linear by branch switch using logic judging circuit to become
Change to threshold condition and meet；
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 reaches with the presence of noise in soft-start time
Before, all without because step voltage causes out-put supply to neglect to open and close suddenly, overcoming prior art output voltage can be presented synchronous
Staged rises, and easily produces the shortcoming of voltage overshoot；
Digital circuit need not be added, without oscillator and counter, structure is simpler reliable, is particularly suitable for high reliability
It is required that apparatus field；
Using high-precision quick comparator circuit, the time threshold of soft start judges more accurate；
Using precision comparator, when the voltage on charging capacitor reaches certain value, comparator is inverted, soft start
Complete, therefore the startup time can accurately set, simultaneously as charging process meets linear changing relation, it is different by choosing
Soft start charging capacitor, low 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 that the controllability with the time of startup and
The flexible setting of soft-start time can be realized；
After matrix current adjustment circuit unlatching, the linear energy storage device of the present invention also has filtering and pressure stabilization function, keeps passage
Electric current is stable.
Brief description of the drawings
Fig. 1 is module diagram of the invention；
Fig. 2 is the physical circuit schematic diagram of the embodiment of the present invention；
Fig. 3 is the reference constant-current source schematic diagram of the embodiment of the present invention；
Fig. 4 is prior art soft start waveform diagram.
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 in 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 is connected
The grid of power switch, electricity are connected 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 is used as using divider resistance maximum potential point 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 first reference point of potential, can be with
Loaded by power supply VCC connections, load can be resistance, the triode or FET that are connected with resistance, 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, by N:1 electric current
Mirror image, makes the electric current reduce certain multiple, forms low current charge branch road, and the precision of the electric current can influence soft-start time
Precision, in actual use, on the basis of Fig. 3, situation is embodied with reference to Fig. 2, then separately sets a current mirror, this
Current mirror is by reference current source IoutConversion is to reference to constant-current source Iref, result in more preferable currents match characteristic.
ENB signals control a nmos switch, for the control of the enable of the functional module, and as ENB=0, the module is being just
Often work, as ENB=1, can make the soft start function of the module fail.
Before soft start completion, linear rise, 1.15V is reached until changing voltage during B point voltage follow C point voltages
Comparator turn threshold, N1 switches open, and A point voltages reach B points, then B points voltage will just be changed into 1.2V, and soft start is completed.
It is noted that a condition：Reference voltage 1>That marked in reference voltage 2, physical circuit is VREF1=1.2V,
VREF2=1.15V, two voltages need closely, can so avoid the progress VREF1 and VREF2 near judgment threshold from cutting
Step is produced when changing to rise.
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 embodiment of the easy reasonable construction present invention, linear energy storage device needs to be full of in advance
Electricity (or can also be charged by charging circuit, but integrated circuit volume can be increased), charging circuit can be no longer set and
Replaced with current sink circuit (current sink), the input of comparator, which can correspond to replace with, meets 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 foregoing is only a specific embodiment of the 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 be readily occurred in, all should
It is included within the scope of the present invention.
Claims (7)
1. the linear soft starting circuit that a kind of time is controllable, it is characterised in that including
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 or of the first reference voltage
One reference voltage belongs to the neighborhood of the second reference voltage；
Linear energy storage device, its voltage and the first reference voltage, correspond to the passage for the switch for accessing to 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 switch unlatching turned off or on power supply regulator circuit of the voltage swing relationships synchronization control charging circuit of pressure, or
By linear energy storage device voltage and the second reference voltage voltage swing relation control interlocking charging circuit switch close and
The switch of power supply regulator circuit is opened.
2. the linear soft starting circuit that a kind of time according to claim 1 is controllable, it is characterised in that described power supply is adjusted
Whole circuit, including
First potential point (A), its voltage is the first reference voltage；
N-channel FET, its first reference voltage of access that drains；
Amplifier switched output circuits, its amplifier in-phase input end connects the source electrode of N-channel FET, and junction is used as the second electricity
Site (B).
3. the linear soft starting circuit that a kind of time according to claim 1 or 2 is controllable, it is characterised in that described patrols
Decision circuitry is collected, including
Hysteresis loop comparator, its in-phase input end accesses the second reference voltage；
Phase inverter, the output end and output end that its input connects hysteresis loop comparator is connected to charging circuit switch and power supply adjustment
The control end of contactor.
4. the linear soft starting circuit that a kind of time according to claim 3 is controllable, it is characterised in that described charging electricity
Road, including
First current mirroring circuit, reception 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), is made up of, it connects the potential point of P-channel field-effect transistor (PEFT) pipe drain electrode voltage identical with linear energy storage device
It is connected to the inverting input of hysteresis loop comparator and the second potential point (B) is also connected to by resistance.
5. the linear soft starting circuit that a kind of time according to claim 4 is controllable, it is characterised in that described reference is permanent
Stream source, including
Second current mirroring circuit, one branch road is 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 is connected with CTAT current circuit, the grid of FET and drain electrode electricity on the branch road
Pressure is identical；
Described the second current mirroring circuit and the 3rd current mirroring circuit, its another branch road drain electrode, which is interconnected, is used as common output
End, the electric current of output end is to refer to constant-current source.
6. the linear soft starting circuit that a kind of time according to claim 5 is controllable, it is characterised in that described linear storage
Energy device, including electric capacity, electric capacity one end connects the second potential point (B) and the other end is grounded.
7. the linear soft starting circuit that a kind of time according to claim 2 is controllable, it is characterised in that the second described electricity
Site (B), is connected with switch of releasing, and the control end input for switch of releasing has enable signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621428907.9U CN206517296U (en) | 2016-12-24 | 2016-12-24 | A kind of controllable linear soft starting circuit of time |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621428907.9U CN206517296U (en) | 2016-12-24 | 2016-12-24 | A kind of controllable linear soft starting circuit of time |
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| CN206517296U true CN206517296U (en) | 2017-09-22 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106505849A (en) * | 2016-12-24 | 2017-03-15 | 成都卓创科微电子有限公司 | A kind of controllable linear soft starting circuit of time |
| CN111162669A (en) * | 2019-12-13 | 2020-05-15 | 潍柴动力股份有限公司 | Sensor power supply soft start method and device, storage medium and electronic equipment |
| CN111245215A (en) * | 2020-04-02 | 2020-06-05 | 深圳能芯半导体有限公司 | Power supply soft start method and 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 |
-
2016
- 2016-12-24 CN CN201621428907.9U patent/CN206517296U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106505849A (en) * | 2016-12-24 | 2017-03-15 | 成都卓创科微电子有限公司 | A kind of controllable linear soft starting circuit of time |
| CN111162669A (en) * | 2019-12-13 | 2020-05-15 | 潍柴动力股份有限公司 | Sensor power supply soft start method and device, storage medium and electronic equipment |
| CN111245215A (en) * | 2020-04-02 | 2020-06-05 | 深圳能芯半导体有限公司 | Power supply soft start method and circuit |
| CN111245215B (en) * | 2020-04-02 | 2023-02-28 | 深圳能芯半导体有限公司 | Power supply soft start method and 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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Effective date of registration: 20200318 Address after: Room 705, block a, No. 159, Chengjiang Middle Road, Jiangyin City, Wuxi City, Jiangsu Province Patentee 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 Patentee before: CHENGDU ZHUOCHUANGKE MICROELECTRONIC Co.,Ltd. |