CN106533146A - Soft starting switch circuit and electronic apparatus - Google Patents
Soft starting switch circuit and electronic apparatus Download PDFInfo
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- CN106533146A CN106533146A CN201510583182.4A CN201510583182A CN106533146A CN 106533146 A CN106533146 A CN 106533146A CN 201510583182 A CN201510583182 A CN 201510583182A CN 106533146 A CN106533146 A CN 106533146A
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Abstract
The invention relates to a soft starting switch circuit and an electronic apparatus. The soft starting switch circuit comprises an input end, an output end, a first transistor, a second transistor, a third transistor, a charge energy storage unit, a first resistor and a second resistor. When the input voltage received on the input end changes into high potential from low potential, the second transistor is connected to provide a charging path so that the charge energy storage unit can store electric energy. The voltage on the control end of the first transistor gradually decreases, so that the first transistor is connected gradually to send the input voltage of the input end to the output end to serve as output voltage. When the input voltage received on the input end changes into low potential from high potential, the third transistor is connected to provide a discharging path so that the charge energy storage unit can release the stored electric energy.
Description
Technical field
The present invention is related to a kind of on-off circuit, and particularly being capable of surge current suppression (inrush
Current soft start (soft-start) on-off circuit) and the dress of the electronics with the soft start switch circuit
Put.
Background technology
As electric equipment products are when the power supply provided by power supply unit is received, power supply unit can be because defeated
Go out excessive transient current (being also called surge current) and cause the injury of element in electric equipment products.In order to
Avoid, when electric equipment products start, causing to damage because of excessive transient current, power supply unit is being opened
Dynamic is first, and the electric energy of controllable output gradually rises up to normal value by little, to avoid the injury to circuit,
Above-mentioned Starting mode is referred to as soft start.For example, pulsewidth modulation (pulse width can be passed through
Modulation, PWM) controller gradually increases output the mode that controls the work period and produces to electrical equipment
The electric energy of product, completes soft start.
First, Fig. 1 is refer to, Fig. 1 is the circuit diagram of traditional soft start switch circuit.Traditional soft is opened
Dynamic on-off circuit 1 has input IN, output end OUT, and including the first transistor Q1, second
Transistor Q2, first resistor R1, second resistance R2, electric charge energy-storage units 101 and circuit protection list
Unit 103.One end of electric charge energy-storage units 101 is electrically connected at input IN and the first transistor Q1
First end.First resistor R1One end be electrically connected with input IN and electric charge energy-storage units 101
One end, first resistor R1The other end be electrically connected with circuit protection unit 103 one end it is brilliant with second
Body pipe Q2Control end.The first transistor Q1The second end be electrically connected with output end OUT.Second is electric
Resistance R2One end be electrically connected with the other end and the first transistor Q of electric charge energy-storage units 1011
Control end.Second resistance R2The other end be electrically connected with transistor seconds Q2First end.
The other end of circuit protection unit 103 is electrically connected to earth terminal.
The first transistor Q1Can be P-type mos field-effect transistor (P type
Metal-Oxide-Semiconductor Field-Effect Transistor, P type MOSFET), which
One end, the second end and control end are the source electrode of P-type mos field-effect transistor respectively
End, drain electrode end and gate terminal.Transistor seconds Q2Can be NPN bipolar junction transistors (NPN
Bipolar Junction Transistor, NPN BJT), its first end, the second end and control end difference
It is collector terminal, emitter-base bandgap grading end and the base terminal of NPN bipolar junction transistors.
Input IN is to receives input voltage Vin, and output end OUT is then to provide output electricity
Pressure VoutThe load connected to which.First resistor R1To in transistor seconds Q2During conducting, formed
One cross-pressure, to avoid transistor seconds Q2Burn or breakdown.Second resistance R2To second
Transistor Q2Another cross-pressure is formed during conducting, to avoid the first transistor Q1Control end on voltage
In transistor seconds Q2Directly it is changed into electronegative potential (such as 0 volt) during conducting.Electric charge energy-storage units 101
To in the input voltage V for receiving high potential (such as 90 volts)inWhen, electric charge is stored, so that the
One transistor Q1Control end on voltage rapidly will not decline.
In input voltage VinWhen becoming high potential by electronegative potential (such as 0 volt), second resistance R2's
Voltage instantaneous on one end are input voltage VinHigh potential.Then, transistor seconds Q2Can turn on,
To provide electric charge energy-storage units 101 charge path storage electric energy, and cause the first transistor Q1Control
(resistance R on end processed2One end on) voltage slowly decline.As the first transistor Q1Control end
On voltage drop to and the first transistor Q1First end on voltage (that is, input voltage Vin)
When forming a specific pressure drop, the first transistor Q1Can turn on, so that the first transistor Q1Second
End can be by input voltage VinAs output voltage VoutExport to the load of output end OUT connection.By
In the presence of electric charge energy-storage units 101, therefore the first transistor Q1Can't rapidly turn on, and reach
To the function of soft start, it is to avoid produce output current IQ1(that is, by the first transistor Q1Electric current)
For excessive transient current.
Electric charge energy-storage units 101 include voltage clamping element CL, electric capacity C and 3rd resistor R3, its
Middle voltage clamping element CL, electric capacity C and 3rd resistor R3One end be electrically connected with input IN with
The first transistor Q1First end, voltage clamping element CL, electric capacity C and 3rd resistor R3It is another
One end is electrically connected with second resistance R2One end.Electric capacity C is to store electric charge, and 3rd resistor R3
Resistance value and electric capacity C capacitance may decide that soft start during (the first transistor Q1From part
It is conducting to the fully on time).Cross-pressures of the voltage clamping element CL to limiting capacitance C two ends,
Which may, for example, be Zener diode (Zener diode), and one end of voltage clamping element CL with it is another
One end is the cathode terminal and anode tap of Zener diode respectively.
In addition, protection circuit unit 103 can limit transistor seconds Q2Control end on voltage
It is only capable of reaching a specific potential, there is provided protection transistor seconds Q2Function, it is to avoid transistor seconds
Q2It is burned out or punctures.Protection circuit unit 103 includes Zener diode Z and diode D1, together
Receive the cathode terminal of diode Z and anode tap is electrically connected with resistance R1The other end and diode D1
Anode tap, and diode D1Cathode terminal be electrically connected to earth terminal.
Referring to the input voltage that Fig. 1 and Fig. 2, Fig. 2 are traditional soft start switch circuit, defeated
Go out the oscillogram of voltage and output current.As shown in the transverse axis of Fig. 2, in 30 milliseconds of time section
In, soft start switch circuit has 3 times by input voltage VinHigh potential is become by electronegative potential (0 volt)
(90 volts), it is however generally that, within the so short time, it is not with hand switch institute by user
Cause.Furthermore, it is understood that the purpose of this example in explanation due to artificial factor, also or electrical equipment connects
Mouthful it is poor quality and cause the unstable of signal of communication, affect soft start switch circuit efficiency,
If conducting letter jitter is produced trembling, input IN may carry out multiple switching in moment,
Traditional soft start switch circuit can lose the function of soft start because of wherein electric capacity saturation.
As shown in Fig. 2 about 1 millisecond or so of time, traditional soft start switch circuit is in 1 first
It is secondary when being activated, input voltage VinHigh potential (90 volts) is become by electronegative potential (0 volt).Then,
In about 2.5 milliseconds or so of time, transistor seconds Q2It is switched on, cause electric capacity C to be electrically charged,
And the first transistor Q1Little by little turn on (from partially ON to fully on), therefore, output current
IQ1About 8 amperes, rather than an excessive transient current, in other words, surge current can be
Traditional soft start switch circuit 1 is suppressed when starting for the first time.
Then, input voltage VinWhen the time being 6 milliseconds, beginning becomes electronegative potential by high potential.
Then, when the time being about 11 milliseconds, traditional soft start switch circuit is activated for 1 second, defeated
Enter voltage VinHigh potential is become by electronegative potential, but because electric capacity C is fully charged, nothing
Method continues to be electrically charged again, therefore the first transistor Q1Can be immediately fully on, cause output current IQ1
For an excessive transient current (90 amperes).In other words, surge current is in traditional soft start switch electricity
In road 1, understand because of conducting letter jitter and in the case that moment carries out multiple switching, it is impossible to have
Effect it is suppressed.
In addition, Republic of China's bulletin TW I378632 patents of invention case discloses a kind of with tool wave
Gush the lock control bridge rectifier of demand limiter.In startup stage, the fixed voltage source of two inputs is still
It is not provided with giving four polarity driven circuits of lock control bridge rectifier, and the four of lock control bridge rectifier
The passage of individual lock control transistor is not yet formed, thus surge current be only capable of flowing through current inrush limiter with
Two of lock control bridge rectifier have the body diode of the lock control transistor of body diode, and surge
Therefore electric current can be limited to safety value by current inrush limiter.Aforementioned four lock control transistor can be according to
Driven according to the state of optical coupling signal respectively, to bypass current inrush limiter, and to input electricity
Pressure carries out bridge rectifier, and wherein surge current can pass through two two of parallel connection in current inrush limiter
Pole pipe is limited with the resistance for being series at described two diodes.However, this case non-usage electric capacity
The electric charge of input voltage is obtained charging, and thereby reduces surge current.
In addition, the People's Republic of China discloses CN104242413A patent application cases and takes off
Extend the circuit structure of conduction time after having revealed a kind of power cut-off.When voltage order one input circuit structure
Holding circuit, and circuit structure output voltage decline after, the discharge control switch control of circuit structure
Circuit processed sends a PNP switching transistor of voltage control signal to circuit structure, and then makes electricity
Another PNP switching transistors conducting of line structure.Now the voltage on the electric capacity of circuit structure is less than
Voltage on another electric capacity of circuit structure, so that the voltage on this another electric capacity can be supplied to power supply module
Electricity, raises equivalent to the input voltage by power supply module.However, this case does not inquire into circuit structure
The problem of produced surge current during startup.
The content of the invention
The embodiment of the present invention provides a kind of soft start switch circuit, and the soft start switch circuit has defeated
Enter end and output end, and including the first transistor, transistor seconds, third transistor, electric charge energy storage
Unit, first resistor and second resistance.The first transistor, transistor seconds, third transistor point
Ju You not first end, the second end, control end.Second end of the first transistor is electrically connected with output end.
One end of electric charge energy-storage units is electrically connected with the first end of input and the first transistor.First resistor
One end is electrically connected with input.One end of second resistance be electrically connected with the other end of electric charge energy-storage units with
The control end of the first transistor.The control end of transistor seconds is electrically connected with the other end of first resistor,
The first end of transistor seconds is electrically connected with the other end of second resistance, the second end electricity of transistor seconds
Property is connected to earth terminal.The first end of third transistor is electrically connected with electric charge energy storage list with the second end
One end of unit and the other end, the control end of third transistor are electrically connected with the other end of first resistor.When
When the input voltage that input is received becomes high potential by electronegative potential, transistor seconds can be turned on, to carry
Electric charge energy-storage units are made to store electric energy for charge path, the voltage allowed in the control end of the first transistor delays
Decline fastly, and the first transistor is little by little turned on, the input voltage of input is sent to into output
End is used as output voltage.When the input voltage that input is received becomes electronegative potential by high potential, the 3rd
Transistor can be turned on, and cause electric charge energy storage to provide the discharge path being made up of electric capacity and third transistor
Unit discharges the electric energy of its storage.
In an embodiment, the electric charge energy-storage units include：
One voltage clamping element；
One electric capacity；And
One 3rd resistor；
Wherein one end of each of the voltage clamping element, the electric capacity and the 3rd resistor and the other end
It is respectively the one end and the other end of the electric charge energy-storage units.
In an embodiment, the voltage clamping element be Zener diode, the one of the Zener diode
Cathode terminal and an anode tap are respectively the one end of the voltage clamping element and the other end.
In an embodiment, when the input voltage that the input is received becomes the low electricity by the high potential
During position, the voltage clamping element be the voltage at the first end of the strangulation third transistor and second end
Differ from and make the third transistor to turn on, so that the electric energy stored by which can be discharged rapidly by the electric capacity.
In an embodiment, the first transistor is that crystal is imitated in a P-type mos field
Pipe, the source-side of the P-type mos field-effect transistor, a drain electrode end and a grid
End is respectively the first end, second end and control end of the first transistor；The transistor seconds
For a NPN type bipolar junction transistors, a collector terminal of the NPN type bipolar junction transistors,
One emitter-base bandgap grading end is respectively the first end, second end and control of the transistor seconds with a base terminal
End；And the third transistor be a NPN type bipolar junction transistors, the NPN type two-carrier
One collector terminal of junction transistor, an emitter-base bandgap grading end and a base terminal be respectively the transistor seconds this
One end, second end and the control end.
In an embodiment, also including a circuit protection unit, the circuit protection unit includes：
One diode；And
Zener diode；
One cathode terminal of the wherein Zener diode is electrically connected with the other end of the first resistor, and this two
One anode tap of pole pipe is electrically connected with an anode tap of the Zener diode, and the diode is one cloudy
The earth terminal is electrically connected with extremely.
The embodiment of the present invention also provides a kind of electronic installation, and the electronic installation includes that above-mentioned soft start is opened
Powered-down road and load.The input of soft start switch circuit can be electrically connected with supply power supply with receives input
Voltage, and the output end of soft start switch circuit is electrically connected with load to provide output voltage to load.
In an embodiment, the electric charge energy-storage units include：
One voltage clamping element；
One electric capacity；And
One 3rd resistor；
Wherein one end of each of the voltage clamping element, the electric capacity and the 3rd resistor and the other end
It is respectively the one end and the other end of the electric charge energy-storage units.
In an embodiment, the voltage clamping element be Zener diode, the one of the Zener diode
Cathode terminal and an anode tap are respectively the one end of the voltage clamping element and the other end.
In an embodiment, the first transistor is that crystal is imitated in a P-type mos field
Pipe, the source-side of the P-type mos field-effect transistor, a drain electrode end and a grid
End is respectively the first end, second end and control end of the first transistor；The transistor seconds
For a NPN type bipolar junction transistors, a collector terminal of the NPN type bipolar junction transistors,
One emitter-base bandgap grading end is respectively the first end, second end and control of the transistor seconds with a base terminal
End；And the third transistor be a NPN type bipolar junction transistors, the NPN type two-carrier
One collector terminal of junction transistor, an emitter-base bandgap grading end and a base terminal be respectively the transistor seconds this
One end, second end and the control end.
It is comprehensive the above, the soft start switch circuit of the present invention can be in input institute receives input electricity
Pressure is when high potential is changed into electronegative potential, there is provided the electricity stored by its electric charge energy-storage units by discharge path
Can release.Thus, it is upper once start soft start switch circuit when, electric charge energy-storage units still can
Storage electric energy, and there is soft start function, to reduce the generation of surge current.
To enable the feature and technology contents that are further understood that the present invention, refer to below in connection with this
Bright detailed description and accompanying drawing, but these explanations are only used for illustrating the present invention with appended accompanying drawing, rather than
Any restriction is made to the interest field of the present invention.
Description of the drawings
Describe its example embodiment in detail by referring to accompanying drawing, above and other feature of the present invention and
Advantage will be apparent from.
Fig. 1 is the circuit diagram of traditional soft start switch circuit.
Fig. 2 is the waveform of the input voltage, output voltage and output current of traditional soft start switch circuit
Figure.
Circuit diagrams of the Fig. 3 for the soft start switch circuit of the embodiment of the present invention.
Fig. 4 is input voltage, output voltage and the output of the soft start switch circuit of the embodiment of the present invention
The oscillogram of electric current.
Transistors electric charge energy-storage units are provided with discharge path of Fig. 5 A for the embodiment of the present invention
Each end on voltage oscillogram.
Partial enlarged drawings of Fig. 5 B for the oscillogram of Fig. 5 A.
Block diagrams of the Fig. 6 for the electronic installation of the embodiment of the present invention.
Wherein, description of reference numerals is as follows：
1、3：Soft start switch circuit
101、301：Electric charge energy-storage units
103、303：Circuit protection unit
Q1：The first transistor
Q2：Transistor seconds
Q3：Third transistor
R1：First resistor
R2：Second resistance
R3：3rd resistor
C：Electric capacity
CL：Voltage clamping element
D1：Diode
Z：Zener diode
L：Discharge path
IN：Input
OUT：Output end
IQ1：Output current
60：Electronic installation
601：Soft start switch circuit
603：Load
62：Supply power supply
Vin：Input voltage
Vout：Output voltage
Ve：Emitter voltage
Vb：Base voltage
Specific embodiment
Be to improve traditional soft start switch circuit 1 as shown in Figure 1 after being activated for the second time, i.e., it is defeated
Enter voltage VinWhen becoming high potential by electronegative potential second, electric capacity C cannot be in the moment of previous step-down
Discharge electric energy is unable to continue to be electrically charged again, therefore the first transistor Q1Can be immediately fully on,
Cause output current IQ1For an excessive transient current.In other words, surge current is opened in traditional soft
After dynamic on-off circuit starts for 1 second, it is impossible to be effectively suppressed.Below by the reality to the present invention
The technical scheme that used of effective surge current suppression for applying example offer is described further.
First, Fig. 3, circuit diagrams of the Fig. 3 for the soft start switch circuit of the embodiment of the present invention be refer to.
The soft start switch circuit 3 of the present invention has input IN, output end OUT, and brilliant including first
Body pipe Q1, transistor seconds Q2, third transistor Q3, first resistor R1, second resistance R2、
Electric charge energy-storage units 301 and circuit protection unit 303.
One end of electric charge energy-storage units 301 is electrically connected at input IN and the first transistor Q1
One end.First resistor R1One end be electrically connected with one end of input IN and electric charge energy-storage units 301,
First resistor R1The other end be electrically connected with one end and the transistor seconds Q of circuit protection unit 3032
Control end.The first transistor Q1The second end be electrically connected with output end OUT.Second resistance R2
One end be electrically connected with the other end and the first transistor Q of electric charge energy-storage units 3011Control end,
Second resistance R2The other end be electrically connected with transistor seconds Q2First end.Circuit protection unit 303
The other end be electrically connected to earth terminal.Third transistor Q3First end be electrically connected with input IN,
First resistor R1One end, one end of electric charge energy-storage units 301 and the first transistor Q1First end,
Third transistor Q3The second end be electrically connected with the other end of electric charge energy-storage units 301, second resistance
R2One end and the first transistor Q1Control end, third transistor Q3Control end be electrically connected with the
Two-transistor Q2Control end, one end of circuit protection unit 303 and first resistor R1The other end.
In the present embodiment, the first transistor Q1Can be that P-type mos field effect is brilliant
Body pipe, its first end, the second end and control end are P-type mos field effect crystal respectively
The source terminal of pipe, drain electrode end and gate terminal.Transistor seconds Q2With third transistor Q3Can be
NPN bipolar junction transistors, its first end, the second end and control end are NPN two-carriers respectively
The collector terminal of junction transistor, emitter-base bandgap grading end and base terminal.However, above-mentioned the first transistor Q1Also may be used
To be PNP bipolar junction transistors, and transistor seconds Q2With third transistor Q3Can be N
Type metal oxide semiconductor field-effect transistor.Sum it up, the present invention does not limit the first transistor
Q1, transistor seconds Q2With third transistor Q3Type.
Input IN is to receives input voltage Vin, in first time input voltage VinBecome by electronegative potential
During into high potential, electric charge energy-storage units 301 are in the input for receiving high potential (such as 90 volts)
Voltage VinWhen, electric charge is stored, so that the first transistor Q1Control end on voltage will not be rapidly
Decline.Further illustrate, due to the presence of electric charge energy-storage units 301, therefore the first transistor Q1And
Will not rapidly turn on, and reach the function of soft start, it is to avoid produce output current IQ1(that is, lead to
Cross the first transistor Q1Electric current) be excessive transient current.
Electric charge energy-storage units 301 include voltage clamping element CL, electric capacity C and 3rd resistor R3, its
Middle voltage clamping element CL, electric capacity C and 3rd resistor R3One end be electrically connected with input IN with
The first transistor Q1First end, voltage clamping element CL, electric capacity C and 3rd resistor R3It is another
One end is electrically connected with second resistance R2One end.Electric capacity C is to store electric charge, and 3rd resistor R3
Resistance value and electric capacity C capacitance may decide that soft start during (the first transistor Q1From part
It is conducting to the fully on time).Cross-pressures of the voltage clamping element CL to limiting capacitance C two ends,
Which may, for example, be Zener diode (Zener diode), and one end of voltage clamping element CL with it is another
One end is the cathode terminal and anode tap of Zener diode respectively.
It should be noted that in input voltage VinWhen becoming electronegative potential by high potential, voltage clamping unit
Part CL is to strangulation third transistor Q3First end and the cross-pressure at the second end, and turn on the 3rd crystal
Pipe Q3, to make electric capacity C and third transistor Q3Discharge path L is formed, by stored by electric capacity C
Electric energy is excluded rapidly.For example, the cross-pressure formed by voltage clamping element CL is 14 volts,
I.e. the cathode terminal of Zener diode can be higher than anode tap 14 volts, when the input voltage of input IN
VinIt is reduced to 0 volt of (i.e. third transistor Q3The current potential of first end) when, third transistor Q3
The current potential at two ends can be reduced to -14 volts, that is, turn on third transistor Q3.In other words, defeated every time
Enter voltage VinThe moment of electronegative potential is become by high potential, voltage clamping element CL is that strangulation the 3rd is brilliant
Body pipe Q3The voltage difference at first end and the second end simultaneously makes third transistor Q3Conducting, obtains so that electric capacity C
Electric energy stored by which can be discharged rapidly.
In addition, protection circuit unit 303 can limit transistor seconds Q2Control end on voltage
It is only capable of reaching a specific potential, there is provided protection transistor seconds Q2Function, it is to avoid transistor seconds
Q2It is burned out or punctures.Protection circuit unit 303 includes Zener diode Z and diode D1, together
Receive the cathode terminal of diode Z and anode tap is electrically connected with resistance R1The other end and diode D1
Anode tap, and diode D1Cathode terminal be electrically connected to earth terminal.
It is the defeated of the soft start switch circuit of the embodiment of the present invention referring to Fig. 3 and Fig. 4, Fig. 4
Enter the oscillogram of voltage, output voltage and output current.As shown in figure 4, about 1 millisecond of time
Left and right, 3 first time of soft start switch circuit are activated, input voltage VinBy electronegative potential (0 volt)
Become high potential (90 volts).Then, about 2.5 milliseconds or so of time, transistor seconds Q2
It is switched on, cause electric capacity C to be electrically charged, and the first transistor Q1Little by little conducting is (from part
It is conducting to fully on), therefore, output current IQ1About 7.2 amperes, rather than one excessive
Transient current, in other words, surge current is suppressed when soft start switch circuit 3 starts for the first time.
Then, input voltage VinWhen the time being 6 milliseconds, beginning becomes electronegative potential by high potential.
Then, when the time being about 11 milliseconds, soft start switch circuit is activated for 3 second, input electricity
Pressure VinHigh potential is become by electronegative potential again, as the electric energy of electric capacity C is in first time input voltage
VinBecome electronegative potential by high potential to be excluded by discharge path L, therefore the first transistor Q1Similarly
The state of slow conducting is presented, output current I is madeQ1For a relatively low transient current (7.5 amperes).
In other words, surge current all be able to can have after the soft start switch circuit of the present invention starts for more than 3 times
Effect it is suppressed.
Referring to Fig. 3, Fig. 5 A and Fig. 5 B, Fig. 5 A are the embodiment of the present invention to right
The oscillogram of the voltage on each end of the transistor of electric charge energy-storage units offer discharge path, and Fig. 5 B
For the partial enlarged drawing of the oscillogram of Fig. 5 A.Fig. 5 A are embodiment of the present invention third transistor Q3(such as
Fig. 3) the oscillogram of the voltage on each end.From Fig. 5 A, in 1～6.2 millisecond of time section,
Input IN receives input voltage VinAbout 90 volts, due to voltage clamping element CL it is brilliant to the 3rd
Body pipe Q3Each terminal potential strangulation effect, the input voltage V of input INinWith third transistor Q3
Emitter voltage VeVoltage difference have the trend for gradually increasing, at 6.2 milliseconds, input IN's
Input voltage VinWith third transistor Q3Emitter voltage VeVoltage difference stop when reaching 14 volts
Only input power, implies that the voltage limiting value of voltage clamping element 301 is 14 volts.
Significantly, since electrical power law of conservation P=IV, 2.2～2.5 milliseconds of time
In section, due to output current IQ1The instantaneous time of appearance, can cause the input voltage of input IN
VinWith third transistor Q3Emitter voltage VeCan be reduced with identical pressure drop degree simultaneously.
Input voltage V at 6.2 milliseconds, on input INinIt is changed into low from high potential (90 volts)
Current potential (0 volt), that is, third transistor Q3Collector volatge be equally reduced to 0 volt, due to voltage
The pressure limiting effect of strangulation element CL, limits third transistor Q3Emitter voltage VeWith collector electricity
The potential difference of pressure is 14 volts, now, third transistor Q3Emitter voltage VeFor -14 volts.
In 6.2～11 milliseconds of time section, the electric energy of electric capacity C must persistently pass through third transistor Q3
The discharge path L provided after conducting obtains the input voltage V so that input IN gradually dischargingin
With third transistor Q3Emitter voltage VeVoltage difference be gradually reduced.
Fig. 5 B are refer to, in 6.2～11 milliseconds of time section, the electric energy of electric capacity C is persistently obtained
By third transistor Q3Gradually to discharge, in other words, third transistor Q3Base voltage
VbAnd emitter voltage VeBetween potential difference remain continuously conducting voltage.From Fig. 5 B,
When 6.2 milliseconds, the input voltage V of input INin(0 volt of electronegative potential is changed into from high potential (90 volts)
It is special), imply that third transistor Q3Collector volatge be equally reduced to 0 volt, third transistor Q3's
Emitter voltage VeFor -14 volts, third transistor Q3Base voltage VbNegative voltage is reduced to equally,
According to semiconductor element start principle, third transistor Q is made3Base potential VbPotential value keep
More than emitter potential VeAbout 0.6 volt of potential value, obtain so that third transistor Q3Maintain conducting shape
State, to discharge the electric energy after closing input power stored by electric capacity C, comes further effectively to drop accordingly
Low output current IQ1, imply that.
Refer to Fig. 6, block diagrams of the Fig. 6 for the electronic installation of the embodiment of the present invention.Electronic installation 60
Including soft start switch circuit 601 and load 603.Soft start switch circuit 601 is electrically connected with and supplies
Power supply 62 is answered with load 603.
Supply power supply 62 can provide dc source (input voltage Vin) to soft start switch circuit 601,
For example, battery, power supply unit or dc generator.Load 603 is to receive soft start switch electricity
The output voltage V of the output of road 601out, loading 603 (can for example put down for notebook computer, hand-held device
Plate or mobile phone) etc. can connect the electric equipment products or circuit of dc source.Soft start switch circuit 601
The explanation of for example aforementioned Fig. 3 embodiments of circuit structure, here are no longer repeated in detail.It should also be noted that this
Invention is not intended to limit the species of supply power supply 62 and load 603.
In more detail, the input and output end of soft start switch circuit 601 is electrically connected with
Supply power supply 62 and load 603, and by the soft start function of soft start switch circuit 601,
When supply power supply 62 is stopped power supply every time, the electric capacity C in soft start switch circuit 601 is (such as Fig. 3
It is shown) by third transistor Q3The electric charge that electric capacity C is stored by (as shown in Figure 3) is discharged, to avoid
Output current I of the soft start switch circuit 601 when startingQ1(as shown in Figure 3) has excessive feelings
Condition, that is, reduce surge current.Then, output current IQ1(as shown in Figure 3) is via soft start switch
The output end of circuit 601 is sent to load 603.Consequently, it is possible to soft start switch circuit 601 can be with
The possibility that load 603 is damaged because of surge current is greatly reduced.
In sum, the soft start switch circuit of the embodiment of the present invention can be electric charge energy storage with one
Unit provides the transistor of discharge path, and this transistor can be become by high potential in the input voltage for receiving
For electronegative potential when turn on, the electric energy stored by electric charge energy-storage units with providing discharge path discharges.
Thus, it is upper once start soft start switch circuit when (input voltage is changed into high potential from electronegative potential),
Electric charge energy-storage units can still store electric energy, and have soft start function, to reduce surge current
Produce (that is, output current will not be an excessive transient current).In addition, soft being opened by above-mentioned
Dynamic on-off circuit, the load in electronic installation will not receive excessive transient current, therefore, its electricity
The service life of sub-device can increase (that is, spoilage can be reduced).
Embodiments of the invention are the foregoing is only, which is not limited to the patent protection model of the present invention
Enclose.It is any to be familiar with alike those skilled in the art, in without departing from spirit and scope of the invention, the change made
And the equivalence replacement of retouching, still in the scope of patent protection for the present invention.
Claims (10)
1. a kind of soft start switch circuit, with an input, an output end, it is characterised in that
Including：
One the first transistor, with a first end, one second end and a control end, the first crystal
Second end of pipe is electrically connected with the output end；
One electric charge energy-storage units, one end of the electric charge energy-storage units be electrically connected with the input with this first
The first end of transistor；
One first resistor, its one end are electrically connected with the input；
One second resistance, its one end are electrically connected with the other end and the first crystal of the electric charge energy-storage units
The control end of pipe；
One transistor seconds, with a first end, one second end and a control end, its control end
The other end of the first resistor is electrically connected with, its first end is electrically connected with the another of the second resistance
End, its second end is electrically connected to an earth terminal；And
One third transistor, with a first end, one second end and a control end, its first end
With the one end that second end is electrically connected with the electric charge energy-storage units and the other end, its control
End is electrically connected with the other end of the first resistor；
Wherein when the input voltage that the input is received becomes a high potential by an electronegative potential, this
Two-transistor can be turned on, and make the electric charge energy-storage units store electric energy to provide a charge path, allow this
A voltage in the control end of one transistor slowly declines, and the first transistor is little by little led
It is logical, the input voltage is delivered to the output end as an output voltage；When being somebody's turn to do that the input is received
When input voltage becomes the electronegative potential by the high potential, the third transistor can be turned on, and be put with providing one
Power path causes the electric charge energy-storage units to discharge the electric energy of its storage.
2. soft start switch circuit as claimed in claim 1, it is characterised in that the electric charge energy storage
Unit includes：
One voltage clamping element；
One electric capacity；And
One 3rd resistor；
Wherein one end of each of the voltage clamping element, the electric capacity and the 3rd resistor and the other end
It is respectively the one end and the other end of the electric charge energy-storage units.
3. soft start switch circuit as claimed in claim 2, it is characterised in that the voltage clamping
Element is Zener diode, and a cathode terminal and an anode tap of the Zener diode are respectively the voltage
The one end of strangulation element and the other end.
4. soft start switch circuit as claimed in claim 2, it is characterised in that when the input
When the input voltage for receiving becomes the electronegative potential by the high potential, the voltage clamping element is that strangulation should
The first end of third transistor is with the voltage difference at second end and turns on the third transistor, so that
Electric energy stored by which can be discharged rapidly by the electric capacity.
5. soft start switch circuit as claimed in claim 1, it is characterised in that the first crystal
Guan Weiyi P-type mos field-effect transistors, the P-type mos field are imitated
The source-side of transistor, a drain electrode end and a gate terminal be respectively the first transistor this first
End, second end and the control end；The transistor seconds is a NPN type bipolar junction transistors,
One collector terminal of the NPN type bipolar junction transistors, an emitter-base bandgap grading end and a base terminal respectively should
The first end of transistor seconds, second end and the control end；And the third transistor is one
NPN type bipolar junction transistors, a collector terminal of the NPN type bipolar junction transistors,
Emitter-base bandgap grading end is respectively the first end, second end and control of the transistor seconds with a base terminal
End.
6. soft start switch circuit as claimed in claim 1, it is characterised in that also electric including
Road protection location, the circuit protection unit include：
One diode；And
Zener diode；
One cathode terminal of the wherein Zener diode is electrically connected with the other end of the first resistor, and this two
One anode tap of pole pipe is electrically connected with an anode tap of the Zener diode, and the diode is one cloudy
The earth terminal is electrically connected with extremely.
7. a kind of electronic installation, it is characterised in that include：
One load；And
A kind of soft start switch circuit as claimed in claim 1, with one input voltage of reception one
Input with export an output end of the output voltage to the load.
8. electronic installation as claimed in claim 7, it is characterised in that the electric charge energy-storage units bag
Include：
One voltage clamping element；
One electric capacity；And
One 3rd resistor；
Wherein one end of each of the voltage clamping element, the electric capacity and the 3rd resistor and the other end
It is respectively the one end and the other end of the electric charge energy-storage units.
9. electronic installation as claimed in claim 8, it is characterised in that the voltage clamping element is
Zener diode, a cathode terminal and an anode tap of the Zener diode are respectively the voltage clamping unit
The one end of part and the other end.
10. electronic installation as claimed in claim 7, it is characterised in that the first transistor is
P-type mos field-effect transistor, the P-type mos field-effect transistor
Source-side, a drain electrode end and a gate terminal be respectively the first transistor the first end, this
Two ends and the control end；The transistor seconds be a NPN type bipolar junction transistors, the NPN
One collector terminal of type bipolar junction transistors, an emitter-base bandgap grading end and a base terminal are respectively second crystal
The first end of pipe, second end and the control end；And the third transistor is that a NPN type is double
Carrier junction transistor, a collector terminal of the NPN type bipolar junction transistors, an emitter-base bandgap grading end with
One base terminal is respectively the first end, second end and control end of the transistor seconds.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510583182.4A CN106533146B (en) | 2015-09-11 | 2015-09-11 | Soft start switch circuit and electronic device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510583182.4A CN106533146B (en) | 2015-09-11 | 2015-09-11 | Soft start switch circuit and electronic device |
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| CN106533146A true CN106533146A (en) | 2017-03-22 |
| CN106533146B CN106533146B (en) | 2018-11-20 |
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| Application Number | Title | Priority Date | Filing Date |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108710593A (en) * | 2018-05-24 | 2018-10-26 | 环旭电子股份有限公司 | A kind of method of supplying power to and device based on Type-C connectors |
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| CN108710593A (en) * | 2018-05-24 | 2018-10-26 | 环旭电子股份有限公司 | A kind of method of supplying power to and device based on Type-C connectors |
| CN108710593B (en) * | 2018-05-24 | 2021-10-15 | 环旭电子股份有限公司 | Power supply method and device based on Type-C connector |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106533146B (en) | 2018-11-20 |
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