CN104578742B - A kind of soft-start circuit - Google Patents
A kind of soft-start circuit Download PDFInfo
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- CN104578742B CN104578742B CN201310504587.5A CN201310504587A CN104578742B CN 104578742 B CN104578742 B CN 104578742B CN 201310504587 A CN201310504587 A CN 201310504587A CN 104578742 B CN104578742 B CN 104578742B
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- switching transistor
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- power supply
- start circuit
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
- H02H9/025—Current limitation using field effect transistors
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Abstract
The present invention provides a kind of soft-start circuit, comprising: the first power supply；Second source；Access the capacitor of the first power supply；With the concatenated switching transistor of the capacitor, grid accesses the first input end of second source；First control module, for the source-drain voltage V in the switching transistorDSWhen greater than preset threshold, the switching transistor work is controlled in linear zone.The V of soft-start circuit of the invention in switching transistor VT1DSWhen greater than preset threshold, is worked by the first control module control switch transistor VT1 in linear zone, make switching transistor VT1 is equivalent to become an impedance to inhibit dash current.Since the present invention is according to VDSSwitching transistor VT1 is controlled, therefore lower to the requirement of the matching degree of switching transistor VT1 and capacitor C1, applicability is stronger；In addition, soft-start circuit of the invention also has the characteristics that structure is simple, at low cost, long working life.
Description
Technical field
The present invention relates to circuit fields, especially soft-start circuit.
Background technique
Soft-start circuit in communication equipment, which is mainly used in, needs to carry out hot plug or the input terminal with capacitive load
Mouthful.Since in the momentary capacitance short circuit powered on, the electric current moment of input circuit increases to infinity, input equipment guarantor may cause
The case where shield and switch are struck sparks, even more serious situation are to lead to device failure on input circuit, therefore necessity is inputting
Increase soft-start circuit on circuit.
Currently, the delay startup of communication power supply direct-flow input end mouth mostly uses greatly switching device and control circuit to be composed,
There is various schemes, but various schemes do not have versatility, each defective.Application number CN200810006443.6, it is " a kind of
Direct-current power supply slow startup control circuit " is to utilize load in parallel with capacitor, by slowly opening trickle charge of the metal-oxide-semiconductor realization to capacitor
Electricity, after the completion of capacitor charging, load starting, defect is that capacitor needs are matched with metal-oxide-semiconductor, when not yet completing charging such as capacitor,
Its metal-oxide-semiconductor has just been connected, and can still make the device on excessive circuit damage circuit, and allowing metal-oxide-semiconductor to match with capacitor is very
Difficult, it is not suitable for bulky capacitor occasion at least；Application number CN200910167268.3, " soft-start circuit of power supply " are adopted
With the mode of relay, buffer resistance and control circuit, delay startup is realized using buffer resistance, relay, which is attracted, realizes normal band
It carries, defect is there are problems that mechanical life, and it is big to account for plate space；Application number CN200920018753.X, " a kind of reduction power supply opens
The soft-start circuit of dynamic power " utilizes metal-oxide-semiconductor and SPWM circuit control mode, during startup by constantly switching metal-oxide-semiconductor,
The booting power consumption of metal-oxide-semiconductor is reduced, realization delay, and defect is to build that SPWM circuit is relative complex, and cost also will increase, while continuous
Metal-oxide-semiconductor is switched, stress can be generated.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of soft-start circuits, are able to solve all of above-mentioned patent and ask
Topic.
In order to solve the above technical problems, the embodiment of the present invention provides a kind of soft-start circuit characterized by comprising
First power supply；
Second source；
Access the capacitor of the first power supply；
With the concatenated switching transistor of the capacitor, grid accesses the first output end of second source；
First control module, for the source-drain voltage V in the switching transistorDSWhen greater than preset threshold, described in control
Switching transistor works in linear zone；
The switching transistor is N-MOS pipe, drain electrode and the capacitance connection, source electrode ground connection；The second source
It further include second output terminal；
First control module includes voltage regulation unit, the second output of the input terminal of the voltage regulation unit and the second source
End connection, output end are connect by the first control switch with the grid of the switching transistor, source electrode, for being believed according to work
Number voltage is provided for the source electrode and grid of the switching transistor, so that switching transistor work is in linear zone；
Or
The switching transistor is P-MOS pipe, drain electrode and the capacitance connection, and source electrode accesses first power supply；
The input terminal of the voltage regulation unit is connect with first power supply, and output end passes through the second control switch and the switch crystal
The grid of pipe, source electrode connection.
In a preferred embodiment, first control module further include:
Sampling unit, for acquiring the V of the switching transistorDS, as the VDSWhen greater than preset threshold, according to described
VDSWorking signal is provided to first control module.
In a preferred embodiment, further includes:
Second control module, for working as the V of the switching transistorDSWhen less than preset threshold, the switch crystal is controlled
Area is connected in ohm in pipe work.
In a preferred embodiment, the sampling unit is also used to: as collected VDSWhen less than preset threshold, disconnect
First control switch；As collected VDSWhen greater than preset threshold, it is closed first control switch.
In a preferred embodiment, the second source further includes third output end；
Second control module include first can breakdown diode, cathode connect with the third output end, just
Pole is connect with the source electrode of the switching transistor；
When first control switch disconnects, second source breakdown described first breakdown diode and can reach institute
The source electrode of switching transistor is stated, so that area is connected in ohm in switching transistor work.
In a preferred embodiment, the sampling unit is also used to: as collected VDSWhen less than preset threshold, disconnect
Second control switch；As collected VDSWhen greater than preset threshold, it is closed second control switch.
In a preferred embodiment, second control module include second can breakdown diode, cathode with it is described
The connection of first power supply, anode are connect with the first output end of the grid of the switching transistor and the second source respectively；
The voltage of the second source is less than the voltage of first power supply；
When second control switch disconnects, first power supply breakdown described second breakdown diode and can reach institute
The grid of switching transistor is stated, so that area is connected in ohm in switching transistor work.
In a preferred embodiment, further includes:
Temperature compensation module；Its control terminal is connect with the sampling unit, for being opened according to the working signal described
It closes transistor and carries out temperature-compensating.
In a preferred embodiment, the temperature compensation module access is between the voltage regulation unit and control switch.
In a preferred embodiment, the sampling unit accesses the switching transistor especially by bleeder circuit
VDS；
The bleeder circuit includes first resistor, second resistance and 3rd resistor；Wherein
The first resistor first end is connect with the source electrode of the switching transistor, second end and the 3rd resistor
First end connection；
The second resistance first end is connect with the drain electrode of the switching transistor, second end and the 3rd resistor
First end connection；
The second end of the 3rd resistor is connect with the sampling unit.
Above scheme of the invention has the following beneficial effects: soft-start circuit of the invention in the V of switching transistorDSGreatly
When preset threshold (dash current of soft-start circuit is excessive), existed by the work of the first control module control switch transistor
Linear zone makes switching transistor is equivalent to become an impedance to inhibit dash current.Since the present invention is according to VDSIt is brilliant to switch
Body pipe is controlled, therefore lower to the requirement of the matching degree of transistor and capacitor, and applicability is stronger；It slow is opened in addition, of the invention
Dynamic circuit also has the characteristics that structure is simple, at low cost, long working life.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of soft-start circuit in the present invention；
Fig. 2 be the present invention in the first control module soft-start circuit structural schematic diagram；
Fig. 3 be the present invention in the second control module soft-start circuit structural schematic diagram；
Fig. 4 is detailed circuit diagram of the N-MOS pipe as the soft-start circuit of switching transistor in the present invention；
Fig. 5 is detailed circuit diagram of the P-MOS pipe as the soft-start circuit of switching transistor in the present invention.
Specific embodiment
To keep the technical problem to be solved in the present invention, technical solution and advantage clearer, below in conjunction with attached drawing and tool
Body embodiment is described in detail.
As shown in Figure 1, a kind of soft-start circuit, comprising:
First power supply VCC1；
Second source VCC2；
Access the capacitor C1 of the first power supply VCC1；
With the concatenated switching transistor VT1 of the capacitor C1,1. grid accesses the first output end of second source VCC2；
First control module, for the source-drain voltage V in the switching transistorDSWhen greater than preset threshold, described in control
Switching transistor works in linear zone.
The V of soft-start circuit of the invention in switching transistor VT1DS(soft-start circuit rushes when greater than preset threshold
It is excessive to hit electric current), it is worked by the first control module control switch transistor VT1 in linear zone, keeps switching transistor VT1 equivalent
As an impedance to inhibit dash current.Since the present invention is according to VDSSwitching transistor VT1 is controlled, therefore split
The matching degree requirement for closing transistor VT1 and capacitor C1 is lower, and applicability is stronger；In addition, soft-start circuit of the invention also has
The characteristics of structure is simple, at low cost, long working life.
Wherein, in the above embodiment of the invention, first control module specifically includes:
Sampling unit, for acquiring the V of the switching transistorDS, as the VDSWhen greater than preset threshold, according to described
VDSWorking signal is provided to the first control unit；
Voltage regulation unit makes for providing voltage according to the working signal for the source electrode and grid of the switching transistor
The switching transistor work is obtained in linear zone.
In addition, as shown in Fig. 2, capacitor C1 during the charging process, generated dash current can be gradually reduced, until not right
Other elements generate destruction in circuit, switching transistor VT1 can be made fully at this time, finish capacitor C1 quick charge, because
This in the above embodiment of the invention, the soft-start circuit further include:
Second control module, for working as the V of the switching transistor VT1DSWhen less than preset threshold, it is brilliant to control the switch
Area is connected in ohm in body pipe VT1 work.
In addition, in the present invention, the used switching transistor VT1 type of soft-start circuit is different, and circuit structure also can
It is distinct, switching transistor VT1 is managed and is used on the basis of foregoing embodiments below P-MOS pipe using N-MOS
Circuit structure is illustrated respectively.
<mode one>
As shown in figure 4, the switching transistor is N-MOS pipe, drain electrode and the capacitance connection, source electrode ground connection；Institute
State second source further include second output terminal 2.；
2. the input terminal of the voltage regulation unit is connect with the second output terminal of the second source VCC2, output end and institute
The grid connection of switching transistor VT1 is stated, and is connect by the first control switch with the source electrode of the switching transistor VT1；
The sampling unit is also used to: as collected VDSWhen less than preset threshold, the control switch is disconnected；Work as acquisition
The V arrivedDSWhen greater than preset threshold, it is closed the control switch.
Specifically, the second source VCC2 further include third output end 3.；
Second control module include first can breakdown diode VD1,3. cathode connect with the third output end,
Its anode is connect with the source electrode of the switching transistor VT1；
When first control switch disconnects, the second source VCC2 breakdown described first can breakdown diode VD1
And the source electrode of the switching transistor VT1 is reached, so that area is connected in ohm in switching transistor VT1 work.
The working principle for the soft-start circuit that switching transistor VT1 is N-MOS pipe is described in detail below:
As shown in figure 4, capacitor C1 instantaneous short circuit, VCC1 is fully loaded to switching transistor VT1's in VCC1 powered on moment
Source electrode and drain electrode, at this time VDSGreater than preset threshold, sampling unit sends a control signal to the first control switch, makes its closure, together
When sampling unit generate working signal to voltage regulation unit, voltage regulation unit according to working signal to the source electrode of switching transistor VT1 and
Grid power supply, to change the gate source voltage V of switching transistor VT1GS, make its work in linear zone, inhibit dash current (its principle
Based on transistor working characteristics, i.e. linear zone:).Hereafter, as the voltage in capacitor C1 gradually accumulates, make
Obtain VDSIt being gradually reduced, when being less than preset threshold, sampling unit sends control signal to the first control switch, make its disconnection,
Sampling unit stops sending working signal to voltage regulation unit simultaneously, causes voltage regulation unit to stop working, at this time second source VCC2
Second output terminal 2. disconnect so that second source VCC2 increases through third output end voltage 3., breakdown first can puncture two
Pole pipe VD1 reaches the source electrode of switching transistor VT1, makes its gate source voltage VGSChange, area's (its original is connected in ohm in final work
Reason is again based on transistor working characteristics, i.e. area is connected in ohm:).Later, after capacitor C1 charging complete,
First power supply VCC1 flow direction load, delay startup are completed.Wherein, first control switch is preferably delay switch, by slow
Closing or opening prevents electric current from generating stress.It should be pointed out that above-mentioned sampling unit and voltage regulation unit are in circuit field
Common technological means, does not repeat herein.
<mode two>
As shown in figure 5, when the switching transistor VT1 is P-MOS pipe, drain electrode and the capacitance connection, source electrode are connect
Enter the first power supply VCC1；
The input terminal of the voltage regulation unit is connect with the first power supply VCC1, output end and the switching transistor
The source electrode of VT1 connects, and is connect by the second control switch with the grid of the switching transistor VT1；
The sampling unit is also used to: as collected VDSWhen less than preset threshold, the control switch is disconnected；Work as acquisition
The V arrivedDSWhen greater than preset threshold, it is closed the control switch.
Specifically, second control module can breakdown diode VD2, cathode and first power supply including second
VCC1 connection, anode are connect with the grid of the switching transistor VT1；The voltage of the second source is less than first electricity
The voltage in source；
When second control switch disconnects, the first power supply VCC1 breakdown described second can breakdown diode VD2
And the grid of the switching transistor VT1 is reached, so that area is connected in ohm in switching transistor VT1 work.
The working principle for the soft-start circuit that switching transistor VT1 is P-MOS pipe is described in detail below:
As shown in figure 5, capacitor C1 instantaneous short circuit, VCC1 is fully loaded to switching transistor VT1's in VCC1 powered on moment
Source electrode and drain electrode, at this time VDSGreater than preset threshold, sampling unit sends control signal to the second control switch, makes its closure, together
When, sampling unit is according to VDSWorking signal is sent to voltage regulation unit, voltage regulation unit is according to working signal to switching transistor VT1's
Source electrode and grid power supply, to change the gate source voltage V of switching transistor VT1GS, make its work in linear zone, inhibit dash current.
Hereafter, as the voltage in capacitor C1 gradually accumulates, so that VDSBe gradually reduced, until be less than preset threshold when, sampling unit to
Second control switch sends control signal, makes its disconnection, while sampling unit stops sending working signal to voltage regulation unit, causes
Voltage regulation unit stops working, and the circuit that the first power supply VCC1 reaches A point through voltage regulation unit at this time disconnects, so that the first power supply VCC1
Reach second can the voltage of breakdown diode VD2 increase, thus puncture this second can breakdown diode VD2, and it is brilliant to reach switch
The grid of body pipe VT1 makes its gate source voltage VGSChange, area is connected in ohm in final work.Later, after capacitor C1 charging complete,
First power supply VCC1 flow direction load, delay startup are completed.Wherein, second control switch is preferably delay switch, by slow
Closing or opening prevents electric current from generating stress.
Further, since the operation interval and V of switching transistor VT1GSIt is related, according to the end transistor device handbook GS
Threshold voltage can be arrived and is affected by temperature, and therefore, for the operation interval for guaranteeing stability contorting switching transistor VT1, of the invention is slow
Start-up circuit further include:
Temperature compensation module；Its control terminal is connect with the sampling module, for according to the working signal to it is described into
Trip temperature compensation.
Specifically, as shown in Figure 4 and Figure 5, the temperature compensation module access is opened in the voltage regulation unit and the control
Between pass, the working power of the source of working power of temperature compensation module temperature compensation module in second source, Fig. 5 in Fig. 4
Then derive from the first power supply.It should be pointed out that the prior art is existing many temperature-compensating skills for being directed to switching transistor
Art, since the circuit structure being related to is not unique, so no longer repeating herein temperature compensation module.
In addition, as shown in Figure 4 and Figure 5, the sampling unit accesses the switching transistor VT1 especially by bleeder circuit
VDS, so that VDSIt is divided in the voltage range that can be worked to sampling unit, wherein
The bleeder circuit includes first resistor R1, second resistance R2 and 3rd resistor R3；Wherein
The first resistor R1 first end is connect with the source electrode of the switching transistor VT1, second end and the third
The first end of resistance R3 connects；
The second resistance R2 first end is connect with the drain electrode of the switching transistor VT1, second end and the third
The first end of resistance R3 connects；
The second end of the 3rd resistor R3 is connect with the sampling unit.
In conclusion the present invention is lower to the matching degree requirement of switching transistor VT1 and capacitor C1, applicability is stronger；Into
One step, soft-start circuit of the invention also have the characteristics that structure is simple, at low cost, long working life.
The above is a preferred embodiment of the present invention, it is noted that for those skilled in the art
For, without departing from the principles of the present invention, it can also make several improvements and retouch, these improvements and modifications
It should be regarded as protection scope of the present invention.
Claims (10)
1. a kind of soft-start circuit characterized by comprising
First power supply；
Second source；
Access the capacitor of the first power supply；
With the concatenated switching transistor of the capacitor, grid accesses the first output end of second source；
First control module, for the source-drain voltage V in the switching transistorDSWhen greater than preset threshold, the switch is controlled
Transistor works in linear zone；
The switching transistor is N-MOS pipe, drain electrode and the capacitance connection, source electrode ground connection；The second source also wraps
Include second output terminal；
First control module includes voltage regulation unit, and the second output terminal of the input terminal of the voltage regulation unit and the second source connects
It connects, output end is connect by the first control switch with the grid of the switching transistor and source electrode, for according to working signal
Voltage is provided for the source electrode and grid of the switching transistor, so that switching transistor work is in linear zone；
Or
The switching transistor is P-MOS pipe, drain electrode and the capacitance connection, and source electrode accesses first power supply；It is described
The input terminal of voltage regulation unit is connect with first power supply, and output end passes through the second control switch and the switching transistor
Grid is connected with source electrode.
2. soft-start circuit according to claim 1, which is characterized in that first control module further include:
Sampling unit, for acquiring the V of the switching transistorDS, as the VDSWhen greater than preset threshold, according to the VDSTo
First control module provides working signal.
3. soft-start circuit according to claim 2, which is characterized in that further include:
Second control module, for working as the V of the switching transistorDSWhen less than preset threshold, the switching transistor work is controlled
Make that area is connected in ohm.
4. soft-start circuit according to claim 3, which is characterized in that the sampling unit is also used to: when collected
VDSWhen less than preset threshold, first control switch is disconnected；As collected VDSWhen greater than preset threshold, it is closed described the
One control switch.
5. soft-start circuit according to claim 4, which is characterized in that
The second source further includes third output end；
Second control module include first can breakdown diode, cathode connect with the third output end, it is positive and
The source electrode of the switching transistor connects；
When first control switch disconnects, second source breakdown described first breakdown diode and can be opened described in reaching
The source electrode of transistor is closed, so that area is connected in ohm in switching transistor work.
6. soft-start circuit according to claim 3, which is characterized in that the sampling unit is also used to: when collected
VDSWhen less than preset threshold, second control switch is disconnected；As collected VDSWhen greater than preset threshold, it is closed described the
Two control switches.
7. soft-start circuit according to claim 6, which is characterized in that
Second control module include second can breakdown diode, cathode connect with first power supply, positive to distinguish
It is connect with the first output end of the grid of the switching transistor and the second source；The voltage of the second source is less than institute
State the voltage of the first power supply；
When second control switch disconnects, first power supply breakdown described second breakdown diode and can be opened described in reaching
The grid of transistor is closed, so that area is connected in ohm in switching transistor work.
8. according to the described in any item soft-start circuits of claim 4 to 7, which is characterized in that further include:
Temperature compensation module；Its control terminal is connect with the sampling unit, for brilliant to the switch according to the working signal
Body pipe carries out temperature-compensating.
9. soft-start circuit according to claim 8, which is characterized in that the temperature compensation module access is in the pressure stabilizing
Between unit and control switch.
10. according to the described in any item soft-start circuits of claim 2 to 7, which is characterized in that the sampling unit especially by
Bleeder circuit accesses the V of the switching transistorDS；
The bleeder circuit includes first resistor, second resistance and 3rd resistor；Wherein
The first resistor first end is connect with the source electrode of the switching transistor, and the first of second end and the 3rd resistor
End connection；
The second resistance first end is connect with the drain electrode of the switching transistor, and the first of second end and the 3rd resistor
End connection；
The second end of the 3rd resistor is connect with the sampling unit.
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| CN201310504587.5A CN104578742B (en) | 2013-10-23 | 2013-10-23 | A kind of soft-start circuit |
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| CN201310504587.5A CN104578742B (en) | 2013-10-23 | 2013-10-23 | A kind of soft-start circuit |
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| CN104578742B true CN104578742B (en) | 2019-03-29 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106787667A (en) * | 2017-02-07 | 2017-05-31 | 北京百卓网络技术有限公司 | Switching Power Supply soft-start circuit and control method |
| CN107026436A (en) * | 2017-04-17 | 2017-08-08 | 顺丰科技有限公司 | Electricity is relieved a garrison the functional module of firing circuit, electron speed regulator and high-voltage great-current |
| CN111371439A (en) * | 2020-03-10 | 2020-07-03 | 深圳市九九智能科技有限公司 | Buffer time delay adjusting device |
| CN114079370A (en) * | 2020-08-17 | 2022-02-22 | 维谛公司 | Output hot plug circuit |
| CN115940902A (en) * | 2022-12-31 | 2023-04-07 | 广州慧智微电子股份有限公司 | Switching circuit |
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| JPH0389845A (en) * | 1989-04-28 | 1991-04-15 | Nec Ibaraki Ltd | Slow start circuit |
| CN101252309A (en) * | 2008-02-04 | 2008-08-27 | 中兴通讯股份有限公司 | Direct-current power supply slow startup control circuit |
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| CN104578742A (en) | 2015-04-29 |
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