CN108418410A - Soft starting circuit with output voltage feedback - Google Patents
Soft starting circuit with output voltage feedback Download PDFInfo
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- CN108418410A CN108418410A CN201810217258.5A CN201810217258A CN108418410A CN 108418410 A CN108418410 A CN 108418410A CN 201810217258 A CN201810217258 A CN 201810217258A CN 108418410 A CN108418410 A CN 108418410A
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- operational amplifier
- comparator
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- voltage
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/36—Means for starting or stopping converters
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The present invention provides a kind of soft starting circuits with output voltage feedback, are applied to DC/DC chips, including：Start time decision circuitry and soft start sub-circuit.Wherein, start feedback voltage and the first preset reference voltage that time decision circuitry is used for comparable chip, when feedback voltage is more than or equal to the first preset reference voltage, output soft start finishing control instruction.Soft start sub-circuit is used to be instructed according to feedback voltage and soft start finishing control, when the instruction of soft start finishing control is the first signal, the reference voltage that output change with feedback voltage is to the in-phase input end of operational amplifier, the inverting input reception feedback voltage of operational amplifier；When the instruction of soft start finishing control is second signal, the in-phase input end of the second preset reference voltage of output to operational amplifier.As it can be seen that this programme adjusts the time of soft start according to feedback voltage, and the reference voltage input value of input operational amplifier is controlled, realizes slowly climbing for soft start stage reference voltage.
Description
Technical field
The present invention relates to field of circuit technology more particularly to a kind of soft starting circuits with output voltage feedback.
Background technology
In DC/DC chips, the surge current that output voltage overshoot and inductance flow through in order to prevent is excessive, it will usually
DC/DC chip interiors add soft starting circuit, are overshooted with the surge current and output voltage that inhibit inductance.
Specifically, as shown in Figure 1, by taking BUCK topological circuits as an example, illustrate the operation principle of soft starting circuit, the DC/DC
Circuit includes comparison circuit EA, compensation network circuit, logic circuit, slope compensation circuit, soft starting circuit and load (Cout
And Rload).In startup stage, system feedback voltage VFB and reference voltage VREF_SS is input to comparison circuit EA's jointly
Input terminal terminates soft start, at this point, the input of comparison circuit EA when reference voltage VREF_SS rises to predeterminated voltage VREF
End is system feedback voltage VFB and predeterminated voltage VREF.
Common soft starting circuit is as shown in FIG. 2 and 3, wherein and Fig. 2 charges to capacitance Css by electric current I,
Fig. 3 charges to capacitance Css by resistance R, using the storage capacity of capacitance Css, realizes that reference voltage VREF_SS's is slow
It climbs.
However, it is found by the inventors that above-mentioned soft starting circuit needs to ensure that reference voltage VREF_SS slowly climbs
The capacitance Css for selecting capacity larger removes this, since the capacity of capacitance Css is fixed so that the soft-start time of the soft starting circuit
Tss is changeless.As shown in figure 4, when load it is larger cause system output voltage VOUT rise it is slower when, system can still go out
The phenomenon that existing output voltage overshoots or inductance surge current is excessive, and then burn device.
To sum up, how a kind of soft starting circuit is provided, soft-start time can be made to be realized according to system feedback voltage adjustable
Section, and the memory capacity of capacitance is reduced, it is those skilled in the art's big technical barrier urgently to be resolved hurrily.
Invention content
In view of this, the present invention provides a kind of soft starting circuit with output voltage feedback, soft-start time can be made
It is realized and is adjusted according to system feedback voltage, and reduce the memory capacity of capacitance.
To achieve the above object, technical solution provided by the invention is as follows：
A kind of soft starting circuit with output voltage feedback, is applied to DC/DC chips, the DC/DC chips include operation
The output end of amplifier, the operational amplifier is connected by logic circuit with inductance, and the soft starting circuit includes：When startup
Between decision circuitry and soft start sub-circuit；
The feedback voltage and the first preset reference voltage for starting time decision circuitry and being used for the chip, works as institute
When stating feedback voltage more than or equal to the first preset reference voltage, output soft start finishing control instruction；
The soft start sub-circuit is used to be instructed according to the feedback voltage and the soft start finishing control, when described
When the instruction of soft start finishing control is the first signal, reference voltage that output changes with the feedback voltage to the operation amplifier
The inverting input of the in-phase input end of device, the operational amplifier receives the feedback voltage；When the soft start terminates to control
When system instruction is second signal, the in-phase input end of the second preset reference voltage of output to the operational amplifier.
Optionally, further include：Clamp circuit,
The output end in the operational amplifier is arranged in the clamp circuit, the output for dragging down the operational amplifier
Terminal voltage.
Optionally, the startup time decision circuitry includes：First comparator and phase inverter,
The first input end of the first comparator connects the feedback voltage, the second input termination of the first comparator
The first preset reference voltage, the output end of the first comparator are connected with the input terminal of the phase inverter, the reverse phase
The input terminal of device is as first output end for starting time decision circuitry, for exporting first signal, the reverse phase
The output end of device is as the second output terminal for starting time decision circuitry, for exporting the second signal.
Optionally, the soft start sub-circuit includes：Current source, capacitance, the second comparator, first switch pipe, second open
Close pipe and third switching tube；
The input of the current source terminates predeterminated voltage, the output end of the current source respectively with one end of the capacitance with
And the first input end of second comparator is connected, the second input terminal of second comparator and the feedback voltage phase
Even, the output end of the comparator is connected with the control terminal of the first switch pipe, one end ground connection of the first switch pipe, institute
State the first end phase of the other end of first switch pipe and the first input end of second comparator and the second switch pipe
Even, the second end of the second switch pipe and the second end of the third switching tube are same mutually defeated with the operational amplifier
Enter end to be connected, first termination the second preset reference voltage of the third switching tube；
First output end for starting time decision circuitry is connected with the control terminal of the third switching tube, the startup
The second output terminal of time decision circuitry is connected with the control terminal of the second switch pipe.
Optionally, the clamp circuit includes：Third comparator and the 4th switching tube,
The first input end of the third comparator connects third preset reference voltage, and the second of the third comparator is defeated
Enter the output end that end connects the operational amplifier, the control terminal of the output end of the third comparator and the 4th switching tube
It is connected, one end of the 4th switching tube is connected with the output end of the operational amplifier.
Optionally, the capacitance of the capacitance is less than 10pF.
It can be seen via above technical scheme that compared with prior art, the present invention provides a kind of band output voltage feedbacks
Soft starting circuit, be applied to DC/DC chips, DC/DC chips include operational amplifier, and the output end of operational amplifier is by patrolling
Circuit is collected with inductance to be connected.The start-up circuit includes：Start time decision circuitry and soft start sub-circuit.Wherein, when startup
Between decision circuitry be used for comparable chip feedback voltage and the first preset reference voltage, when feedback voltage be more than or equal to first preset
When reference voltage, output soft start finishing control instruction.Soft start sub-circuit according to feedback voltage and soft start for terminating
Control instruction, when the instruction of soft start finishing control is the first signal, reference voltage that output changes with feedback voltage to operation
The inverting input of the in-phase input end of amplifier, operational amplifier receives feedback voltage；When the instruction of soft start finishing control is
When second signal, the in-phase input end of the second preset reference voltage of output to operational amplifier.As it can be seen that this programme is according to feedback electricity
Pressure adjusts the time of soft start, and controls the reference voltage input value of input operational amplifier, realizes soft start stage reference electricity
Pressure is slowly climbed.
Description of the drawings
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
Obtain other attached drawings according to these attached drawings.
Fig. 1 is the structural schematic diagram of DC/DC chips in the prior art；
Fig. 2 and Fig. 3 is the circuit diagram of soft starting circuit in the prior art；
Fig. 4 is oscillogram of the soft starting circuit in startup stage of the prior art；
Fig. 5 is a kind of circuit diagram of soft starting circuit with output voltage feedback provided in an embodiment of the present invention；
Fig. 6 for using the embodiment of the present invention provide the soft starting circuit fed back with output voltage startup stage waveform
Figure.
Specific implementation mode
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation describes, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Referring to Fig. 5, Fig. 5 is a kind of soft starting circuit with output voltage feedback provided in an embodiment of the present invention, application
In DC/DC chips, the DC/DC chips include operational amplifier gm, and the output end of the operational amplifier passes through logic circuit
It is connected with inductance L, the soft starting circuit includes：Start time decision circuitry 51 and soft start sub-circuit 52.
Wherein, the feedback voltage V FB and the first preset reference for starting time decision circuitry and being used for the chip
Voltage 0.95*Vref exports soft start finishing control when the feedback voltage is more than or equal to the first preset reference voltage
Instruction；
The soft start sub-circuit is used to be instructed according to the feedback voltage and the soft start finishing control, when described
When the instruction of soft start finishing control is the first signal, reference voltage that output changes with the feedback voltage to the operation amplifier
The inverting input of the in-phase input end of device, the operational amplifier receives the feedback voltage；When the soft start terminates to control
When system instruction is second signal, the in-phase input end of the second preset reference voltage of output to the operational amplifier.
Except this, soft starting circuit provided in this embodiment further includes：Clamp circuit 53.The clamp circuit is arranged described
The output end of operational amplifier, the output end voltage for dragging down the operational amplifier is system in start-up course, inductance
Electric current will not become larger suddenly, and system is more smooth.
Specifically, the specific implementation circuit of above-mentioned functional circuit is present embodiments provided, it is as follows：
The startup time decision circuitry includes：First comparator and phase inverter,
The first input end of the first comparator connects the feedback voltage, the second input termination of the first comparator
The first preset reference voltage, the output end of the first comparator are connected with the input terminal of the phase inverter, the reverse phase
The input terminal of device is as first output end for starting time decision circuitry, for exporting first signal, the reverse phase
The output end of device is as the second output terminal for starting time decision circuitry, for exporting the second signal.
The soft start sub-circuit includes：Current source, capacitance, the second comparator, first switch pipe, second switch pipe and
Third switching tube；
The input of the current source terminates predeterminated voltage, the output end of the current source respectively with one end of the capacitance with
And the first input end of second comparator is connected, the second input terminal of second comparator and the feedback voltage phase
Even, the output end of the comparator is connected with the control terminal of the first switch pipe, one end ground connection of the first switch pipe, institute
State the first end phase of the other end of first switch pipe and the first input end of second comparator and the second switch pipe
Even, the second end of the second switch pipe and the second end of the third switching tube are same mutually defeated with the operational amplifier
Enter end to be connected, first termination the second preset reference voltage of the third switching tube；
First output end for starting time decision circuitry is connected with the control terminal of the third switching tube, the startup
The second output terminal of time decision circuitry is connected with the control terminal of the second switch pipe.
The clamp circuit includes：Third comparator and the 4th switching tube,
The first input end of the third comparator connects third preset reference voltage, and the second of the third comparator is defeated
Enter the output end that end connects the operational amplifier, the control terminal of the output end of the third comparator and the 4th switching tube
It is connected, one end of the 4th switching tube is connected with the output end of the operational amplifier.
It should be noted that the capacitance of the capacitance is less than 10pF.
That is, the feedback voltage V FB for starting time decision circuitry 51 in the chip is more than the first preset reference voltage
When 0.95*Vref, output soft start finishing control instruction, i.e. the first signal, then the first signal is raw after inverter
At second signal.First signal is for controlling third switch, and when third, which switchs, to be closed, the second preset reference voltage Vref connects
It is connected to the in-phase input end of the operational amplifier.Second signal is for controlling second switch, when second switch is closed, reference
Voltage Vref_ss is connected to the in-phase input end of the operational amplifier.
In the present embodiment, slowly the climbing for realizing soft start stage reference voltage of soft start sub-circuit 52, this electricity
Road monitors the value of feedback voltage V FB, if feedback voltage V FB because output capacitance it is too big or load is bigger cause to climb it is too slow
When, this circuit can control reference voltage Vref _ original places SS and wait until that feedback voltage V FB climbs up, then Vref_
SS just will continue to rise, as shown in Figure 6.Therefore, voltage overshoot or the excessive phenomenon of inductance surge current are avoided.
In conclusion the present invention provides a kind of soft starting circuit with output voltage feedback, it is applied to DC/DC chips,
DC/DC chips include operational amplifier, and the output end of operational amplifier is connected by logic circuit with inductance.The start-up circuit packet
It includes：Start time decision circuitry and soft start sub-circuit.Wherein, start feedback electricity of the time decision circuitry for comparable chip
Pressure and the first preset reference voltage export soft start finishing control when feedback voltage is more than or equal to the first preset reference voltage
Instruction.Soft start sub-circuit is used to be instructed according to feedback voltage and soft start finishing control, when soft start finishing control instructs
For the first signal when, reference voltage that output changes with feedback voltage to the in-phase input end of operational amplifier, operational amplifier
Inverting input receive feedback voltage；When the instruction of soft start finishing control is second signal, output the second preset reference electricity
It is depressed into the in-phase input end of operational amplifier.As it can be seen that this programme adjusts the time of soft start according to feedback voltage, and control input
The reference voltage input value of operational amplifier realizes slowly climbing for soft start stage reference voltage.
Also, further includes the clamp circuit being arranged in the output end of the operational amplifier, put for dragging down the operation
The output end voltage of big device.
Each embodiment is described by the way of progressive in this specification, the highlights of each of the examples are with it is other
The difference of embodiment, just to refer each other for same or similar part between each embodiment.
The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention.
Various modifications to these embodiments will be apparent to those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, of the invention
It is not intended to be limited to the embodiments shown herein, and is to fit to and the principles and novel features disclosed herein phase one
The widest range caused.
Claims (6)
1. a kind of soft starting circuit with output voltage feedback, which is characterized in that be applied to DC/DC chips, the DC/DC chips
Including operational amplifier, the output end of the operational amplifier is connected by logic circuit with inductance, the soft starting circuit packet
It includes：Start time decision circuitry and soft start sub-circuit；
The feedback voltage and the first preset reference voltage for starting time decision circuitry and being used for the chip, when described anti-
When feedthrough voltage is more than or equal to the first preset reference voltage, output soft start finishing control instruction；
The soft start sub-circuit is used to be instructed according to the feedback voltage and the soft start finishing control, soft is opened when described
When dynamic finishing control instruction is the first signal, reference voltage that output changes with the feedback voltage to the operational amplifier
The inverting input of in-phase input end, the operational amplifier receives the feedback voltage；When the soft start finishing control refers to
When order is second signal, the in-phase input end of the second preset reference voltage of output to the operational amplifier.
2. soft starting circuit according to claim 1, which is characterized in that further include：Clamp circuit,
The output end in the operational amplifier is arranged in the clamp circuit, the output end electricity for dragging down the operational amplifier
Pressure.
3. soft starting circuit according to claim 2, which is characterized in that the startup time decision circuitry includes：First
Comparator and phase inverter,
The first input end of the first comparator connects the feedback voltage, and the second of the first comparator inputs described in termination
First preset reference voltage, the output end of the first comparator are connected with the input terminal of the phase inverter, the phase inverter
Input terminal is as first output end for starting time decision circuitry, for exporting first signal, the phase inverter
Output end is as the second output terminal for starting time decision circuitry, for exporting the second signal.
4. soft starting circuit according to claim 2, which is characterized in that the soft start sub-circuit includes：Current source, electricity
Appearance, the second comparator, first switch pipe, second switch pipe and third switching tube；
The input of the current source terminates predeterminated voltage, the output end of the current source respectively with one end of the capacitance and institute
The first input end for stating the second comparator is connected, and the second input terminal of second comparator is connected with the feedback voltage, institute
The output end for stating comparator is connected with the control terminal of the first switch pipe, one end of first switch pipe ground connection, and described the
The other end of one switching tube is connected with the first end of the first input end of second comparator and the second switch pipe, institute
In-phase input end of the second end of the second end and the third switching tube of stating second switch pipe with the operational amplifier
It is connected, first termination the second preset reference voltage of the third switching tube；
First output end for starting time decision circuitry is connected with the control terminal of the third switching tube, the startup time
The second output terminal of decision circuitry is connected with the control terminal of the second switch pipe.
5. soft starting circuit according to claim 2, which is characterized in that the clamp circuit includes：Third comparator with
And the 4th switching tube,
The first input end of the third comparator connects third preset reference voltage, the second input terminal of the third comparator
Connect the output end of the operational amplifier, the control terminal phase of the output end of the third comparator and the 4th switching tube
Even, one end of the 4th switching tube is connected with the output end of the operational amplifier.
6. soft starting circuit according to claim 4, which is characterized in that the capacitance of the capacitance is less than 10pF.
Priority Applications (1)
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| CN201810217258.5A CN108418410A (en) | 2018-03-16 | 2018-03-16 | Soft starting circuit with output voltage feedback |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810217258.5A CN108418410A (en) | 2018-03-16 | 2018-03-16 | Soft starting circuit with output voltage feedback |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109067163A (en) * | 2018-08-24 | 2018-12-21 | 上海艾为电子技术股份有限公司 | Soft starting circuit, control chip, buck converter and boost converter |
| CN109217259A (en) * | 2018-10-26 | 2019-01-15 | 成都英特格灵微电子技术有限公司 | It is a kind of for the feedback short circuit protection circuit of Buck and guard method |
| CN109245511A (en) * | 2018-09-25 | 2019-01-18 | 上海艾为电子技术股份有限公司 | The SS (soft start) control circuit and method of Switching Power Supply |
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| CN109067163A (en) * | 2018-08-24 | 2018-12-21 | 上海艾为电子技术股份有限公司 | Soft starting circuit, control chip, buck converter and boost converter |
| CN109245511A (en) * | 2018-09-25 | 2019-01-18 | 上海艾为电子技术股份有限公司 | The SS (soft start) control circuit and method of Switching Power Supply |
| CN109217259A (en) * | 2018-10-26 | 2019-01-15 | 成都英特格灵微电子技术有限公司 | It is a kind of for the feedback short circuit protection circuit of Buck and guard method |
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Application publication date: 20180817 |