CN107733219A - A kind of Switching Power Supply output soft start circuit - Google Patents
A kind of Switching Power Supply output soft start circuit Download PDFInfo
- Publication number
- CN107733219A CN107733219A CN201711055165.9A CN201711055165A CN107733219A CN 107733219 A CN107733219 A CN 107733219A CN 201711055165 A CN201711055165 A CN 201711055165A CN 107733219 A CN107733219 A CN 107733219A
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- China
- Prior art keywords
- power supply
- soft start
- output
- electric capacity
- switching power
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Links
- 230000005611 electricity Effects 0.000 claims description 9
- 239000003990 capacitor Substances 0.000 abstract description 14
- 238000007600 charging Methods 0.000 abstract description 8
- 230000000630 rising effect Effects 0.000 abstract description 3
- 238000000034 method Methods 0.000 abstract 2
- 238000012544 monitoring process Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 7
- 230000002159 abnormal effect Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000004080 punching Methods 0.000 description 2
- 230000004308 accommodation Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
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
- H02M1/00—Details of apparatus for conversion
- H02M1/36—Means for starting or stopping converters
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0083—Converters characterised by their input or output configuration
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a kind of Switching Power Supply output soft start circuit, it is to realize the output soft start circuit that switch power source output voltage is slowly established, directly and feedback link, monitoring in real time, after power supply start, during rising on the output voltage, by being charged to soft start capacitor, and the signal in the charging process is incorporated into voltage feedback loop in real time, the dutycycle of pwm chip is limited with the formal expansion of electric capacity charging index, output voltage is also risen to setting in the form of electric capacity charges index.Relative to prior art, present invention output soft-start method, in the case where feedback control loop is by other any power supply modes such as accessory power supply, still can normal work, and the circuit is very simple, only by several small surface mount elements it is enough into, cost is lower, and reliability is higher.
Description
Technical field
The present invention relates to field of switch power, specifically, being related to a kind of in switch power supply system, realizing Switching Power Supply
The output soft start circuit that output voltage is slowly established.
Background technology
The pwm chip of general Switching Power Supply all carries soft start function, Switching Power Supply during starting up,
Avoid switching device from bearing larger current stress and damage or occur the phenomenon of output voltage overshoot damage electrical equipment.
Although most of pwm chip all carries soft start function, a part of pwm chip is when design
Soft start capacitor is just integrated in the inside of chip, soft-start time can not be adjusted by adjusting the size of soft start capacitor,
So as to can not many times meet product design requirement；, can be with and another part pwm chip is although soft start capacitor is external
Freely set, but can not select it is very big because there are the abnormal conditions such as excessively stream, short circuit in power supply and recovers weight in pwm chip
Qi Shi, because the energy of the soft start capacitor of pwm chip does not discharge also, therefore it is even soft that soft-start time can be caused to shorten
The problem of starting failure.
Even if the soft start that pwm chip carries is set very big, and is not failed, because pwm chip is in original
Side, switch power source output voltage secondary side feedback loop respond feedback from beginning setting up actual primary side, even loop again fast also one
Surely delay is had, is bound to make output voltage the phenomenon overshooted occur during this delay, at this moment voltage feedback loop
End again in saturation, will appear from the phenomenon of owe punching again backward.
And in general system power supply, because the needs of some functions, such as in charge power supply system, shown in Fig. 1,
The feedback control loop of power supply is powered by accessory power supply, and accessory power supply preferentially starts, so that existing conventional output soft start circuit
Soft start capacitor be fully charged in advance, the problem of failure, after making output voltage overshoot serious and there is the phenomenon of owe punching,
Shown in Fig. 2.
Therefore, it is necessary to prior art is improved.
The content of the invention
In view of this, in order to solve the above-mentioned technical problem, the present invention provides a kind of Switching Power Supply output soft start circuit, with
Solve the problems, such as that soft start fails in existing switch power supply system.
The purpose of the present invention is achieved through the following technical solutions, a kind of Switching Power Supply output soft start circuit, including：
First electric capacity, first resistor, the first diode.
The output cathode of the first capacitance connection Switching Power Supply, one end and the one or two pole of other end connection first resistor
The anode of pipe, the output negative pole of the other end connecting valve power supply of first resistor, the negative electrode connecting valve power supply of the first diode
The input of voltage feedback network.
The supply voltage feedback network, can be TL431 reference pin or the input of amplifier.
What the equivalent scheme as above-mentioned technical proposal was achieved through the following technical solutions, including：First electric capacity, the first electricity
Resistance, the first N-type triode.
The output cathode of the first capacitance connection Switching Power Supply, one end of other end connection first resistor and the first N-type
The base stage and colelctor electrode of triode, the output negative pole of the other end connecting valve power supply of first resistor, the hair of the first N-type triode
The input of emitter-base bandgap grading connecting valve supply voltage feedback network.
The supply voltage feedback network, can be TL431 reference pin or the input of amplifier.
What the equivalent scheme as above-mentioned technical proposal was achieved through the following technical solutions, including：First electric capacity, the first electricity
Resistance, second resistance, the first N-type triode.
The output cathode of the first capacitance connection Switching Power Supply, one end of other end connection first resistor and the first N-type
The base stage of triode, the output negative pole of the other end connecting valve power supply of first resistor, the colelctor electrode connection of the first N-type triode
One end of second resistance, the output cathode of the other end connecting valve power supply of second resistance, the emitter stage of the first N-type triode connect
Connect the input of supply voltage switch feedback network.
The second resistance can be 0 Ohmic resistance.
The supply voltage feedback network, can be TL431 reference pin or the input of amplifier.
What the equivalent scheme as above-mentioned technical proposal was achieved through the following technical solutions, including：First electric capacity, the first electricity
Resistance, second resistance, the first N type switch tube.
The output cathode of the first capacitance connection Switching Power Supply, one end of other end connection first resistor and the first N-type
The grid of switching tube, the output negative pole of the other end connecting valve power supply of first resistor, the drain electrode connection the of the first N type switch tube
One end of two resistance, the output cathode of the other end connecting valve power supply of second resistance, the source electrode connection of the first N type switch tube are opened
The input of powered-down source voltage feedback network.
The second resistance can be 0 Ohmic resistance.
The supply voltage feedback network, can be TL431 reference pin or the input of amplifier.
Compared with prior art, the present invention has the advantages that：
1) this programme solves existing soft starting circuit Problem of Failure；
2) this programme reliability is high, and accommodation is wider；
3) circuit of the present invention is simple, and cost is low, easily designed；
Brief description of the drawings
Fig. 1 is existing output soft start circuit schematic diagram；
Fig. 2 is existing output soft start circuit relative voltage waveforms；
Fig. 3 is the circuit theory diagrams that the embodiment of the present invention one is applied；
Fig. 4 is the relative voltage waveforms of the embodiment of the present invention one；
Fig. 5 is the circuit theory diagrams that the embodiment of the present invention two is applied；
Fig. 6 is the circuit theory diagrams that the embodiment of the present invention three is applied；
Fig. 7 is the circuit theory diagrams that the embodiment of the present invention four is applied.
First embodiment
Show first embodiment of the invention theory diagram in Fig. 3 dotted line frames, a kind of Switching Power Supply output soft start circuit,
Including：First electric capacity C1, first resistor R1, the first diode D1.
The output cathode of the first electric capacity C1 connecting valve power supplys, other end connection first resistor R1 and the first diode
D1 anode, the output negative pole of first resistor R1 other end connecting valve power supply, the first diode D1 negative electrode connecting valve
The input of supply voltage feedback network.
After power supply start, during rising on the output voltage, output voltage is by C1, D1, R3 and R4 loop to loop
In soft start capacitor C1 chargings, and the charging signals are incorporated into feedback control loop in real time, so as to constantly limit PWM control cores
The formal expansion of the output duty cycle of piece and the index that charged with soft start capacitor C1, make output voltage also with electric capacity charging index
Form rises to setting, shown in Fig. 4.
After output voltage rises to setting, output voltage will continue to open to soft in this Weak current loop by C1, R1
Dynamic condenser C1 charges, and hereafter D1 ends naturally, does not influence the work of supply voltage feedback control loop.
Power supply shutdown, excessively stream, short circuit or other abnormal conditions, after closing output, soft start capacitor C1 will be put by R1
Electricity, in case soft start is realized in output foundation again.
Particularly, a kind of Switching Power Supply output soft start circuit in the present invention, soft start capacitor can be according to switch electricity
Product-derived demand, arbitrarily design.
Further, whether relevant the soft starting circuit is only with the foundation of output voltage, with feedback control loop by accessory power supply
It is unrelated etc. other task power supply modes.
Second embodiment
In first embodiment, the diode D1 shown in Fig. 3 dotted line frames can also be N-type triode, institute in Fig. 5 dotted line frames
Show, including：First electric capacity C1, first resistor R1, the first N-type triode Q1.
The output cathode of first electric capacity C1 connecting valve power supplys, other end connection first resistor R1 and the first N-type triode
Q1 base stage and colelctor electrode, the output negative pole of first resistor R1 other end connecting valve power supply, the first N-type triode Q1 hair
The input of emitter-base bandgap grading connecting valve supply voltage feedback network.
Equivalent efficacy can be achieved as first embodiment in the operation principle of circuit after adjustment.
3rd embodiment
Show third embodiment of the invention theory diagram in Fig. 6 dotted line frames, a kind of Switching Power Supply output soft start circuit,
Including：First electric capacity C1, first resistor R1, second resistance R2, the first N-type triode Q1.
The output cathode of the first electric capacity C1 connecting valve power supplys, other end connection first resistor R1 and the first N-type three
Pole pipe Q1 base stage, the output negative pole of first resistor R1 other end connecting valve power supply, the first N-type triode Q1 colelctor electrode
Connect second resistance R2 one end, the output cathode of second resistance R2 other end connecting valve power supply, the first N-type triode Q1
Emitter stage connecting valve supply voltage feedback network input.
After power supply start, during rising on the output voltage, be pole, R3 and R4 loop of the output voltage by C1, Q1
To the soft start capacitor C1 chargings in loop, the base stage to Q1 provides offset signal, allows Q1 to turn on, equivalent by the charging signals
Feedback control loop is incorporated into real time, is referred to so as to constantly limit the output duty cycle of pwm chip with soft start capacitor C1 chargings
Several formal expansions, output voltage is set also to rise to setting in the form of electric capacity charges index.
After output voltage rises to setting, output voltage will continue to open to soft in this Weak current loop by C1, R1
Dynamic condenser C1 charges, and hereafter Q1 ends naturally, does not influence the work of supply voltage feedback control loop.
Power supply shutdown, excessively stream, short circuit or other abnormal conditions, after closing output, soft start capacitor C1 will be put by R1
Electricity, in case soft start is realized in output foundation again.
Particularly, a kind of Switching Power Supply output soft start circuit in the present invention, soft start capacitor can be according to switch electricity
Product-derived demand, arbitrarily design.
Further, whether relevant the soft starting circuit is only with the foundation of output voltage, with feedback control loop by accessory power supply
It is unrelated etc. other task power supply modes.
Equivalent efficacy can be achieved as first embodiment in the operation principle of circuit after adjustment.
Fourth embodiment
In 3rd embodiment, the N-type triode Q1 shown in Fig. 6 dotted line frames can also be N type switch tube, Fig. 7 dotted line frames
Shown in, including：First electric capacity C1, first resistor R1, the first N type switch tube Q2 and second resistance R2.
The output cathode of first electric capacity C1 connecting valve power supplys, other end connection first resistor R1 and the first N type switch tube
Q2 grid, the output negative pole of first resistor R1 other end connecting valve power supply, the first N type switch tube Q2 drain electrode connection the
Two resistance R2 one end, the output cathode of second resistance R2 other end connecting valve power supply, the first N type switch tube Q2 source electrode
The input of connecting valve supply voltage feedback network.
Equivalent efficacy can be achieved as 3rd embodiment in the operation principle of circuit after adjustment.
It the above is only the preferred embodiment of the present invention, it is noted that above-mentioned preferred embodiment is not construed as pair
The limitation of the present invention, for those skilled in the art, without departing from the spirit and scope of the present invention, also
Some improvements and modifications can be made, these improvements and modifications also should be regarded as protection scope of the present invention, here no longer with implementation
Example is repeated, and protection scope of the present invention should be defined by claim limited range.
Claims (4)
- A kind of 1. Switching Power Supply output soft start circuit, it is characterised in that：Including the first electric capacity, first resistor and the one or two pole Pipe, the output cathode of the first capacitance connection Switching Power Supply, the other end of first electric capacity connect the first resistor The anode of one end and first diode, the output negative pole of the other end connecting valve power supply of the first resistor, described the The negative electrode connecting valve power supply of one diode.
- A kind of 2. Switching Power Supply output soft start circuit according to claim 1, it is characterised in that：With the pole of the first N-type three Pipe replaces first diode, and the base stage and colelctor electrode of the first N-type triode connect the another of first electric capacity simultaneously One end, the emitter stage connecting valve power supply of the first N-type triode.
- A kind of 3. Switching Power Supply output soft start circuit according to claim 2, it is characterised in that：Also include the second electricity Resistance, the other end of first electric capacity connect one end of the first resistor and the base stage of the first N-type triode, and described the The colelctor electrode of one N-type triode connects one end of the second resistance, the other end connecting valve power supply of the second resistance Output cathode.
- A kind of 4. Switching Power Supply output soft start circuit according to claim 3, it is characterised in that：Switched with the first N-type Pipe replaces the first N-type triode, and the grid of first N type switch tube connects the other end of first electric capacity, described The source electrode of first N type switch tube connects one end of the second resistance, the drain electrode connecting valve electricity of first N type switch tube Source.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711055165.9A CN107733219A (en) | 2017-11-01 | 2017-11-01 | A kind of Switching Power Supply output soft start circuit |
| PCT/CN2018/095132 WO2019085544A1 (en) | 2017-11-01 | 2018-07-10 | Output soft-start circuit for switching power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711055165.9A CN107733219A (en) | 2017-11-01 | 2017-11-01 | A kind of Switching Power Supply output soft start circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107733219A true CN107733219A (en) | 2018-02-23 |
Family
ID=61203687
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711055165.9A Withdrawn CN107733219A (en) | 2017-11-01 | 2017-11-01 | A kind of Switching Power Supply output soft start circuit |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN107733219A (en) |
| WO (1) | WO2019085544A1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019085544A1 (en) * | 2017-11-01 | 2019-05-09 | 广州金升阳科技有限公司 | Output soft-start circuit for switching power supply |
| CN110572022A (en) * | 2019-09-02 | 2019-12-13 | 广州视源电子科技股份有限公司 | Soft start circuit, method and electric equipment |
| CN111509968A (en) * | 2020-04-28 | 2020-08-07 | 重庆斯微奇电子技术有限公司 | Switching power supply output voltage control circuit |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113937994A (en) * | 2020-06-29 | 2022-01-14 | 鸣志电器(太仓)有限公司 | Soft start circuit and method for switching power supply |
| CN112187222A (en) * | 2020-10-30 | 2021-01-05 | 航宇救生装备有限公司 | Water inlet detection water outlet starting circuit |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080252281A1 (en) * | 2006-09-29 | 2008-10-16 | Innocom Technology (Shenzhen) Co., Ltd. | Switching power supply circuit having soft start circuit |
| CN201928186U (en) * | 2011-01-17 | 2011-08-10 | 南通三信塑胶装备科技有限公司 | Sliding frequency soft startup circuit applied to electromagnetic induction heating power supply |
| CN104852563A (en) * | 2015-05-20 | 2015-08-19 | 重庆大学 | Switching power supply external soft start circuit |
| CN204598412U (en) * | 2015-05-13 | 2015-08-26 | 深圳市垅运照明电器有限公司 | A kind of LED drive power soft starting circuit |
| WO2016015566A1 (en) * | 2014-07-29 | 2016-02-04 | 广州金升阳科技有限公司 | Soft start method and circuit |
| CN205356137U (en) * | 2016-01-12 | 2016-06-29 | 深圳市创维群欣安防科技股份有限公司 | Soft start circuit and switching power supply device |
| CN106604463A (en) * | 2016-12-14 | 2017-04-26 | 深圳Tcl数字技术有限公司 | LED simulating device |
| CN106685204A (en) * | 2017-01-13 | 2017-05-17 | 杭州优特电源有限公司 | Temperature-control soft start circuit |
| CN206389278U (en) * | 2016-12-14 | 2017-08-08 | 广州金升阳科技有限公司 | Self-excited switching power supply circuit |
| CN207573234U (en) * | 2017-11-01 | 2018-07-03 | 广州金升阳科技有限公司 | A kind of Switching Power Supply output soft start circuit |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107733219A (en) * | 2017-11-01 | 2018-02-23 | 广州金升阳科技有限公司 | A kind of Switching Power Supply output soft start circuit |
-
2017
- 2017-11-01 CN CN201711055165.9A patent/CN107733219A/en not_active Withdrawn
-
2018
- 2018-07-10 WO PCT/CN2018/095132 patent/WO2019085544A1/en active Application Filing
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080252281A1 (en) * | 2006-09-29 | 2008-10-16 | Innocom Technology (Shenzhen) Co., Ltd. | Switching power supply circuit having soft start circuit |
| CN201928186U (en) * | 2011-01-17 | 2011-08-10 | 南通三信塑胶装备科技有限公司 | Sliding frequency soft startup circuit applied to electromagnetic induction heating power supply |
| WO2016015566A1 (en) * | 2014-07-29 | 2016-02-04 | 广州金升阳科技有限公司 | Soft start method and circuit |
| CN204598412U (en) * | 2015-05-13 | 2015-08-26 | 深圳市垅运照明电器有限公司 | A kind of LED drive power soft starting circuit |
| CN104852563A (en) * | 2015-05-20 | 2015-08-19 | 重庆大学 | Switching power supply external soft start circuit |
| CN205356137U (en) * | 2016-01-12 | 2016-06-29 | 深圳市创维群欣安防科技股份有限公司 | Soft start circuit and switching power supply device |
| CN106604463A (en) * | 2016-12-14 | 2017-04-26 | 深圳Tcl数字技术有限公司 | LED simulating device |
| CN206389278U (en) * | 2016-12-14 | 2017-08-08 | 广州金升阳科技有限公司 | Self-excited switching power supply circuit |
| CN106685204A (en) * | 2017-01-13 | 2017-05-17 | 杭州优特电源有限公司 | Temperature-control soft start circuit |
| CN207573234U (en) * | 2017-11-01 | 2018-07-03 | 广州金升阳科技有限公司 | A kind of Switching Power Supply output soft start circuit |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019085544A1 (en) * | 2017-11-01 | 2019-05-09 | 广州金升阳科技有限公司 | Output soft-start circuit for switching power supply |
| CN110572022A (en) * | 2019-09-02 | 2019-12-13 | 广州视源电子科技股份有限公司 | Soft start circuit, method and electric equipment |
| CN110572022B (en) * | 2019-09-02 | 2020-10-13 | 广州视源电子科技股份有限公司 | Soft start circuit, method and electric equipment |
| CN111509968A (en) * | 2020-04-28 | 2020-08-07 | 重庆斯微奇电子技术有限公司 | Switching power supply output voltage control circuit |
| CN111509968B (en) * | 2020-04-28 | 2021-10-19 | 重庆斯微奇电子技术有限公司 | Switching power supply output voltage control circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2019085544A1 (en) | 2019-05-09 |
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Application publication date: 20180223 |