CN207039444U - Soft startup circuit for power supply, power supply and charger - Google Patents
Soft startup circuit for power supply, power supply and charger Download PDFInfo
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- CN207039444U CN207039444U CN201720818567.9U CN201720818567U CN207039444U CN 207039444 U CN207039444 U CN 207039444U CN 201720818567 U CN201720818567 U CN 201720818567U CN 207039444 U CN207039444 U CN 207039444U
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- 238000001514 detection method Methods 0.000 claims description 33
- 239000004065 semiconductor Substances 0.000 claims description 29
- 238000004804 winding Methods 0.000 claims description 14
- 239000003990 capacitor Substances 0.000 claims description 12
- 238000005070 sampling Methods 0.000 claims description 5
- 208000031361 Hiccup Diseases 0.000 abstract description 4
- 230000005611 electricity Effects 0.000 description 5
- 230000008859 change Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000012544 monitoring process Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000003139 buffering effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000000977 initiatory effect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
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- 238000011897 real-time detection Methods 0.000 description 1
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Abstract
Soft startup circuit for power supply, power supply and charger are the utility model is related to, the soft starting circuit includes：Control module, for exporting conductivity control signal and soft start electric current；It is connected with control module, the power switch based on conductivity control signal conducting；It is connected respectively with control module, power switch, charging voltage is produced based on soft start electric current, and when charging voltage reaches reference voltage, power switch described in conductivity control signal is exported by control module and turned on, so that power supply realizes the buffer circuit of soft start.Implementing soft starting circuit of the present utility model can be so that the primary current of transformer on startup be slowly increased, avoid damage or damage of the dash current to element, it can also avoid transformer from sending noise in the case of hiccup, improve the reliability, stability and security of power supply or charger.
Description
Technical field
Power technique fields are the utility model is related to, more specifically to a kind of soft startup circuit for power supply, power supply and are filled
Electrical equipment.
Background technology
In existing driving power technical field, such as LED drive power, in electric power starting due to opening moment, become
The primary side of depressor often produces a higher dash current, and the dash current then can often make the related power of power source internal
Device is impacted and damages or even damage, and such as the metal-oxide-semiconductor of power source internal, when transformer is opened, the controlled system of metal-oxide-semiconductor turns on,
Now just have a higher dash current and flow through metal-oxide-semiconductor, because the dash current of unlatching is larger, therefore, it is very easy to make MOS
Pipe damages or damage, or in the case where hiccup occurs in transformer, noise is sent, so as to reduce the stabilization of driving power
Property, reliability and safety.
Utility model content
The technical problems to be solved in the utility model is, for the drawbacks described above of prior art, there is provided a kind of power supply is soft
Start-up circuit, power supply and charger.
Technical scheme is used by the utility model solves its technical problem：A kind of soft startup circuit for power supply is constructed, is wrapped
Include：
Control module, for exporting conductivity control signal and soft start electric current；
It is connected with the control module, the power switch based on conductivity control signal conducting；
It is connected respectively with the control module, the power switch, charging voltage is produced based on the soft start electric current, and
When the charging voltage reaches reference voltage, conductivity control signal is exported by the control module and controls the power switch
Conducting, so that power supply realizes the buffer circuit of soft start.
In soft startup circuit for power supply described in the utility model, it is preferable that the control module include control unit with
Detection unit, wherein,
The detection unit is connected with described control unit, the buffer circuit respectively, and the detection unit is used for real-time
Detection voltage caused by the buffer circuit before power switch conducting, and reach the reference voltage in the voltage
When export detection signal to described control unit；
Described control unit is based on the detection signal and exports conductivity control signal to the power switch, with described in control
Power switch on or off.
In soft startup circuit for power supply described in the utility model, it is preferable that the reference voltage is the control module
Internal preset reference voltage.
In soft startup circuit for power supply described in the utility model, it is preferable that also include including transformer, the transformer
Primary side winding；
The power switch is metal-oxide-semiconductor, and the drain electrode of the metal-oxide-semiconductor is connected with the primary side winding of the transformer, the MOS
The grid of pipe is connected with described control unit, and the source electrode of the metal-oxide-semiconductor is connected with the buffer circuit.
In soft startup circuit for power supply described in the utility model, it is preferable that also include the source electrode for being connected to the metal-oxide-semiconductor
Current sampling resistor R1 between ground, the current sampling resistor R1 is when the metal-oxide-semiconductor turns on to the original of the transformer
Primary current caused by the winding of side is acquired.
In soft startup circuit for power supply described in the utility model, it is preferable that the detection unit is amplified for comparison operation
Device, the comparator/operational amplifier include input in the same direction, reverse input end and output end；
The input in the same direction is connected between described control unit and the buffer circuit, the reverse input end access
The reference voltage, the output end are connected with described control unit.
In soft startup circuit for power supply described in the utility model, it is preferable that the buffer circuit includes current-limiting resistance R2
With charging capacitor C1, the first end of the current-limiting resistance R2 is connected with the source electrode of the metal-oxide-semiconductor, and the second of the current-limiting resistance R2
End be connected with described control unit, and the node between the second end of the current-limiting resistance R2 and described control unit also with it is described
The input in the same direction connection of comparator/operational amplifier；
The charging capacitor C1 is in parallel with the current-limiting resistance R2.
In soft startup circuit for power supply described in the utility model, it is preferable that the conductivity control signal is PWM control letters
Number.
The utility model additionally provides a kind of power supply, including soft startup circuit for power supply as described above.
The utility model also provides a kind of charger, soft startup circuit for power supply as described above.
Implement soft startup circuit for power supply of the present utility model, have the advantages that：Power supply of the present utility model is soft to be opened
Dynamic circuit includes：Control module, for exporting conductivity control signal and soft start electric current；It is connected with control module, based on conducting
The power switch of control signal conducting；It is connected respectively with control module, power switch, charging electricity is produced based on soft start electric current
Pressure, and when charging voltage reaches reference voltage, conductivity control signal is exported by control module so that power switch realize it is soft
The buffer circuit of startup.Implementing soft starting circuit of the present utility model can be so that the primary current of transformer on startup delays
Slow increase, avoids damage or damage of the dash current to element, can also avoid transformer from sending noise in the case of hiccup, carry
The high reliability of power supply or charger, stability and security.
Brief description of the drawings
Below in conjunction with drawings and Examples, the utility model is described in further detail, in accompanying drawing：
Fig. 1 is the logic diagram of the utility model soft startup circuit for power supply embodiment one；
Fig. 2 is the circuit theory diagrams of the utility model soft startup circuit for power supply embodiment one；
Fig. 3 is the oscillogram of the utility model soft startup circuit for power supply soft start-up process.
Embodiment
In order that the purpose of this utility model, technical scheme and advantage are more clearly understood, below in conjunction with accompanying drawing and implementation
Example, the utility model is further elaborated.It should be appreciated that specific embodiment described herein is only explaining
The utility model, it is not used to limit the utility model.
The problem of existing for prior art, the utility model proposes a kind of soft startup circuit for power supply, and the circuit is in work(
The source electrode access buffer circuit of rate switch, and it is soft to buffer circuit output before output conductivity control signal control power switch pipe
Starting current, soft start electric current is accessed to produce corresponding voltage by buffer circuit, entered using the voltage with reference voltage
Row multilevel iudge, and conductivity control signal is just exported to control power switch to turn on when the voltage reaches reference voltage, simultaneously
So that the primary current of transformer is slowly increased, and then make the purpose of soft startup of electric power.
As shown in figure 1, Fig. 1 shows the logic diagram of one specific embodiment of the utility model soft startup circuit for power supply,
For convenience of description, it illustrate only the part related to the utility model embodiment.
In the embodiment, the soft startup circuit for power supply includes：Control module 30, power switch 10 and buffer circuit 20,
Wherein, control module 30 is used to export conductivity control signal and soft start electric current；Power switch 10 is connected with control module 30, and
The conductivity control signal on or off exported based on control module 30；Buffer circuit 20 is opened with control module 30 and power respectively
10 connections are closed, charging voltage are produced based on the soft start electric current that control module 30 exports, and reach reference voltage in charging voltage
When, the conductivity control signal control power switch 10 exported by control module 30 turns on, and then power supply is realized soft start.
Further, the soft startup circuit for power supply of the present embodiment also includes transformer 40, and transformer 40 includes primary side winding,
Wherein, primary side winding is connected with power switch 10, and produces primary current when power switch 10 turns on.
Specifically, as shown in figure 1, the control module 30 of the present embodiment includes control unit 301 and detection unit 302, its
In, detection unit 302 is connected with control unit 301, buffer circuit 20 respectively, and it is mainly used in detection in real time in power switch 10
Voltage caused by buffer circuit 20 before conducting, while the voltage is judged compared with reference voltage, when judging the electricity
Pressure exports detection signal to control unit 301 when reaching reference voltage, to notify voltage caused by buffer circuit 20 to reach base
Quasi- voltage.
It is to be appreciated that the reference voltage is the preset reference voltage in the inside of control module 30, its concrete numerical value is by circuit
Specific design determine that the present embodiment is not especially limited.
Control unit 301 is connected with buffer circuit 20 and detection unit 302 respectively, and conducting control is being sent to power switch 10
Continue to export soft start electric current to buffer circuit 20 before signal processed, formed until buffer circuit 20 based on the soft start electric current
(judgement is monitored by detection unit 302 here, i.e., as described above, when detection unit 302 judges this when voltage reaches reference voltage
When voltage reaches reference voltage, corresponding detection signal is exported to control unit 301), control unit 301 is based on detection unit
The detection signal of 302 feedbacks exports corresponding conductivity control signal to power switch 10, and then controls power switch 10 to turn on.
Preferably, in this embodiment, the conductivity control signal that control unit 301 exports is pwm signal, the pwm signal
It is the adjustable pwm signal of bandwidth.As shown in figure 3, the conductivity control signal that control unit 301 exports is the driving shown in Fig. 3
Waveform, its pulse width are changes, and are small pulse width when starting, and then buffering increase, then be gradually reduced, are finally closed
Close.It can thus be seen that detection signal (the detection letter that the control unit 301 of the present embodiment can be fed back according to detection unit 302
Number it is change) conductivity control signal of output pulse change, control power to open by the conductivity control signal of the pulse change
10 conductings, and then the purpose for being slowly increased primary current caused by the primary side winding of transformer 40 are closed, it is achieved thereby that
Make soft startup of electric power, reduce impact of the primary current to power switch 10, be effectively protected power switch 10, avoid power
Switch 10 makes power switch 10 by high peak currents impact failure because transformer 40 produces peak point current on startup.
As shown in Fig. 2 Fig. 2 is the circuit theory diagrams of the utility model soft startup circuit for power supply embodiment one.
In this embodiment, the power switch 10 in soft startup circuit for power supply of the present utility model is metal-oxide-semiconductor, wherein, MOS
The drain electrode of pipe is connected with the primary side winding of transformer 40, and the grid of metal-oxide-semiconductor is connected with control unit 301, and the source electrode of metal-oxide-semiconductor is with delaying
Circuit 20 is rushed to connect.It is to be appreciated that conducting and the pass of the primary side winding of transformer 40 are can control by the on-off action of metal-oxide-semiconductor
It is disconnected.
Further, soft startup circuit for power supply of the present utility model also includes current sampling resistor R1, current sample electricity
Resistance R1 is connected between the source electrode of metal-oxide-semiconductor and ground, for when metal-oxide-semiconductor turns on (i.e. the source electrode of metal-oxide-semiconductor with drain connect) to change
Primary current caused by the primary side winding of depressor 40 is acquired, to monitor primary current in real time.
Detection unit 302 is comparator/operational amplifier, wherein, comparator/operational amplifier include input in the same direction, reversely it is defeated
Enter end and output end.The input in the same direction of comparator/operational amplifier is connected between control unit 301 and buffer circuit 20, its
Reverse input end accesses reference voltage, and its output end is connected with control unit 301.As shown in Fig. 2 comparator/operational amplifier is real-time
Monitoring input terminal voltage in the same direction, (before input terminal voltage in the same direction reaches reference voltage, the B point voltages of the input access in the same direction are
Voltage caused by buffer circuit 20, after reference voltage is reached, the B points voltage is the voltage that control unit 301 exports), and
Input terminal voltage in the same direction is judged compared with the reference voltage on reverse input end, when judging that input terminal voltage in the same direction reaches
During to reference voltage, output end exports detection signal to control unit 301.
Buffer circuit 20 includes current-limiting resistance R2 and charging capacitor C1, wherein, current-limiting resistance R2 first end and metal-oxide-semiconductor
Source electrode is connected, and current-limiting resistance R2 the second end is connected with control unit 301, and current-limiting resistance R2 the second end and control unit
Node between 301 is also connected with the input in the same direction of comparator/operational amplifier；Charging capacitor C1 is in parallel with current-limiting resistance R2.Can
To understand ground, pass through the resistance R2 that to interleave one in parallel of input in the same direction and the source electrode of metal-oxide-semiconductor in comparator/operational amplifier
With charging capacitor C1, after power initiation, control unit 301 exports soft start electric current to buffer circuit 20 and continued to charging electricity
Hold C1 charging, when charging capacitor C1 is charged to B point voltages is reached reference voltage when, that is, open soft start process.
It should be noted that B points voltage=soft start electric current × R2 before soft start starts, the primary current of transformer 40 increases
The initial level and time constant added can be adjusted by changing current-limiting resistance R2 and charging capacitor C1 value, as long as B points are electric
Force down in reference voltage, soft start electric current can be constantly filled with persistently to charge to charging capacitor C1.
The utility model additionally provides a kind of power supply, and the power supply includes soft startup circuit for power supply as described above.It can manage
Xie Di, power supply provided by the utility model can be applied to LED technology field.
Further, soft startup of electric power power supply of the present utility model could be applicable to charger, inverter and adapter etc..
To make the technical scheme of soft startup circuit for power supply of the present utility model clearer, below to the specific electricity in Fig. 2
The operation principle on road is further described.
As illustrated in fig. 2, it is assumed that reference voltage is 0.5V, (threshold current is for 60uA for the threshold current of soft start electric current
It is corresponding with reference voltage).
After power initiation, the supply voltage VCC of power supply powers to control module 30, now, built in control unit 301
Current source export soft start electric current to charging capacitor C1 and continue to charge to charging capacitor C1, B point voltages persistently rise, and detect
The input terminal voltage in the same direction of comparator/operational amplifier in unit 302 persistently raises, and monitoring is in the same direction in real time for comparator/operational amplifier
The voltage of input simultaneously compared with the voltage of reverse input end and judges the voltage of input in the same direction, in the same direction when judging
When the voltage of input reaches the reference voltage on reverse input end, comparator/operational amplifier exports a detection signal to control
Unit 301, control unit 301 starts to control soft start power supply source to limit the soft of its output after the detection signal is received to be opened
Streaming current (now soft start electric current has reached threshold current), while the grid for exporting conductivity control signal to metal-oxide-semiconductor controls MOS
Pipe turns on, and in other words, soft start control of the present utility model starts.
Because after relatively B point voltages reach reference voltage, control unit 301 controls the limitation of soft start current source is soft to open
Streaming current, therefore, B point voltages start slowly to decline, and comparator/operational amplifier is by the real-time monitoring to the B point voltages and then defeated
Go out corresponding detection signal to control unit 301, control unit 301 and the pulse of conductivity control signal is adjusted according to the detection signal
Width, so that conducting and shut-off of the metal-oxide-semiconductor according to conductivity control signal, and then make electric current caused by the primary side winding of transformer 40
Buffering increase, so as to reach the purpose of soft start.
Further, after detection unit 302 detects power supply normal switch, that is, detection signal is exported to control unit
301, control soft start current source to turn off by control unit 301, soft start terminates.It is to be appreciated that after power supply normal switch,
Buffer circuit 20 of the present utility model is no longer worked, and the circuit of power source internal is not had an impact.
To sum up, soft startup circuit for power supply of the present utility model, the original of the primary side winding of transformer 40 is made by soft start function
Side electric current is slowly increased, and is avoided transformer 40 and is produced peak point current impact metal-oxide-semiconductor on startup and damage metal-oxide-semiconductor, also may be used
Avoid transformer 40 from sending noise in the situation of hiccup, substantially increase the reliability, stability and security of power supply.
For above example only to illustrate technical concepts and features of the present utility model, its object is to allow be familiar with technique
Personage can understand content of the present utility model and implement accordingly, the scope of protection of the utility model can not be limited.It is all with
The equivalent changes and modifications that the utility model claims scope is done, all should belong to the utility model claims covers model
Enclose.
It should be appreciated that for those of ordinary skills, can according to the above description be improved or converted,
And all these modifications and variations should all belong to the protection domain of the appended claims for the utility model.
Claims (10)
- A kind of 1. soft startup circuit for power supply, it is characterised in that including：Control module, for exporting conductivity control signal and soft start electric current；It is connected with the control module, the power switch based on conductivity control signal conducting；It is connected respectively with the control module and the power switch, based on soft start electric current generation charging voltage, and When the charging voltage reaches reference voltage, conductivity control signal is exported by the control module and controls the power switch to lead It is logical, so that power supply realizes the buffer circuit of soft start.
- 2. soft startup circuit for power supply according to claim 1, it is characterised in that the control module include control unit with Detection unit, wherein,The detection unit is connected with described control unit, the buffer circuit respectively, and the detection unit is used to detect in real time The voltage caused by the buffer circuit before power switch conducting, and it is defeated when the voltage reaches the reference voltage Go out detection signal to described control unit；Described control unit is based on the detection signal and exports conductivity control signal to the power switch, to control the power Switch conduction or shut-off.
- 3. soft startup circuit for power supply according to claim 1, it is characterised in that the reference voltage is the control module Internal preset reference voltage.
- 4. soft startup circuit for power supply according to claim 2, it is characterised in that also including transformer, the transformer bag Include primary side winding；The power switch is metal-oxide-semiconductor, and the drain electrode of the metal-oxide-semiconductor is connected with the primary side winding of the transformer, the metal-oxide-semiconductor Grid is connected with described control unit, and the source electrode of the metal-oxide-semiconductor is connected with the buffer circuit.
- 5. soft startup circuit for power supply according to claim 4, it is characterised in that also include the source for being connected to the metal-oxide-semiconductor Current sampling resistor R1 between pole and ground, the current sampling resistor R1 is when the metal-oxide-semiconductor turns on to the transformer Primary current is acquired caused by primary side winding.
- 6. soft startup circuit for power supply according to claim 5, it is characterised in that the detection unit is amplified for comparison operation Device, the comparator/operational amplifier include input in the same direction, reverse input end and output end；The input in the same direction is connected between described control unit and the buffer circuit, described in the reverse input end access Reference voltage, the output end are connected with described control unit.
- 7. soft startup circuit for power supply according to claim 6, it is characterised in that the buffer circuit includes current-limiting resistance R2 With charging capacitor C1, the first end of the current-limiting resistance R2 is connected with the source electrode of the metal-oxide-semiconductor, and the second of the current-limiting resistance R2 End be connected with described control unit, and the node between the second end of the current-limiting resistance R2 and described control unit also with it is described The input in the same direction connection of comparator/operational amplifier；The charging capacitor C1 is in parallel with the current-limiting resistance R2.
- 8. according to the soft startup circuit for power supply described in any one of claim 1 to 7, it is characterised in that the conductivity control signal For pwm control signal.
- 9. a kind of power supply, it is characterised in that including the soft startup circuit for power supply described in any one of claim 1 to 8.
- 10. a kind of charger, it is characterised in that including the soft startup circuit for power supply described in any one of claim 1 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720818567.9U CN207039444U (en) | 2017-07-07 | 2017-07-07 | Soft startup circuit for power supply, power supply and charger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720818567.9U CN207039444U (en) | 2017-07-07 | 2017-07-07 | Soft startup circuit for power supply, power supply and charger |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207039444U true CN207039444U (en) | 2018-02-23 |
Family
ID=61466855
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720818567.9U Expired - Fee Related CN207039444U (en) | 2017-07-07 | 2017-07-07 | Soft startup circuit for power supply, power supply and charger |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207039444U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN113572355A (en) * | 2021-09-26 | 2021-10-29 | 苏州贝克微电子有限公司 | Power supply circuit with stable output voltage |
-
2017
- 2017-07-07 CN CN201720818567.9U patent/CN207039444U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN113572355A (en) * | 2021-09-26 | 2021-10-29 | 苏州贝克微电子有限公司 | Power supply circuit with stable output voltage |
| CN113572355B (en) * | 2021-09-26 | 2021-12-14 | 苏州贝克微电子有限公司 | Power supply circuit with stable output voltage |
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| GR01 | Patent grant | ||
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180223 |