CN109768697A - Protect the suppressing method of circuit, switch power supply system and surge current - Google Patents
Protect the suppressing method of circuit, switch power supply system and surge current Download PDFInfo
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- CN109768697A CN109768697A CN201910080213.2A CN201910080213A CN109768697A CN 109768697 A CN109768697 A CN 109768697A CN 201910080213 A CN201910080213 A CN 201910080213A CN 109768697 A CN109768697 A CN 109768697A
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Abstract
This application discloses the suppressing methods of a kind of protection circuit, switch power supply system and surge current; the protection circuit includes: the first guiding path; be connected between signal input part and signal output end, the first guiding path signal input part to power on the moment in an off state；Second guiding path, in parallel with the first guiding path, the input signal for being provided according to signal input part charges to the load capacitance for being connected to signal output end；And control module, it is connected with signal output end, the output voltage for being provided according to signal output end generates control signal, when output voltage is more than or equal to predetermined value, controls the first guiding path of signal conduction.The protection circuit is connected by control module the first guiding path of control when output voltage is more than or equal to predetermined value, and the surge current in circuit is efficiently reduced, and has achieved the purpose that the reliability for improving circuit.
Description
Technical field
The present invention relates to field of display technology, more particularly, to a kind of protection circuit, switch power supply system and surge
The suppressing method of electric current.
Background technique
Surge (Inrush) electric current refers to that Switching Power Supply connects moment, flows into the peak point current of switch power supply equipment.Due to defeated
Enter filter capacitor to charge rapidly, so the peak point current is far longer than stable state input current.
When the electrical equipment of certain large capacities is switched on or switched off, since " wave there are inductance, will be generated in power grid in power grid
Gush voltage ", to cause surge current.Regardless of place capacity size, can all there be surge voltage, and the equipment of low capacity generates
Surge voltage it is smaller, excessive harm will not be generated, therefore usually ignored by people.But since large value capacitor charges
More several times greater than system normal current or even tens times surge currents can be generated, influence to be connected to all on same power circuit
The operation of equipment, sometimes elements such as blowout and rectifier diode.Therefore, it is necessary to be limited to surge current.
In the prior art, electrification circuit generally comprises switch SW and fuse FUSE, and the two is serially connected in electrification circuit
Between input terminal and output end, input terminal receives input voltage vin, and output end provides output voltage Vout to load Loding,
As shown in Figure 1, wherein the equivalent circuit for loading Loding includes capacitor C and resistance R in parallel.In powered on moment, output voltage
To the capacitor C quick charge in load, the electric current Iout for flowing through electrification circuit can rise rapidly Vout, and generation can reach the left side 11A
Right surge current, as shown in Figure 2.Excessive electric current is likely to result in circuit damage.Therefore, it is desirable to be further improved circuit structure,
To improve the reliability of circuit.
Summary of the invention
It is an object of the invention to provide a kind of protection circuit for the above problem in the presence of the prior art, switch
The suppressing method of power-supply system and surge current.
According to the first aspect of the invention, a kind of protection circuit is provided, comprising:
First guiding path, is connected between signal input part and signal output end, and first guiding path is described
Signal input part to power on the moment in an off state；
Second guiding path, input for according to the signal input part provided in parallel with first guiding path
Signal charges to the load capacitance for being connected to the signal output end；And
Control module is connected with the signal output end and first guiding path, for being exported according to the signal
The output voltage that end provides generates control signal, when the output voltage is more than or equal to predetermined value, the control signal conduction
First guiding path.
Further, the conducting resistance of first guiding path is less than the conducting resistance of second guiding path.
Further, first guiding path includes:
The first transistor, the first path terminal and alternate path end respectively with the signal input part and the signal output end
It is connected, the control terminal of the first transistor receives the control signal；And first resistor, first end and the first crystal
The control terminal of pipe connects, and second end receives upper pull-up voltage or actuation voltage to turn off institute constantly in powering on for the signal input part
State the first transistor.
Further, the first transistor has P-type channel, the second end of the first resistor and the first crystal
First path terminal of pipe be connected using by the input signal as the upper pull-up voltage.
Further, the control module includes:
Second transistor has N-type channel, and the first path terminal receives ground reference, and alternate path end is to described first
The control terminal of transistor provides the control signal；
Bleeder circuit obtains branch pressure voltage, the first end of the bleeder circuit for being divided to the output voltage
It is connect with the first path terminal of the second transistor, the second end of the bleeder circuit is connect with the signal output end, institute
The middle-end for stating bleeder circuit is connect with the control terminal of the second transistor, for the branch pressure voltage to be provided to described second
The control terminal of transistor.
Further, the bleeder circuit includes concatenated 3rd resistor and the 4th resistance, the middle-end of the bleeder circuit
For the intermediate node between the 3rd resistor and the 4th resistance, the 3rd resistor and the 4th resistance are connected on institute
It states between the first end of bleeder circuit and second end.
Further, second guiding path includes:
Second resistance is connected between the signal input part and the signal output end.
Further, the protection circuit further includes switch and fuse,
The switch is connected in series with the fuse, and the input signal is provided to through the switch with the fuse
The signal input part.
According to the second aspect of the invention, a kind of switch power supply system is provided, comprising:
Protection circuit as described in any one of the above embodiments；
Power supply module provides the input signal；
Switching power circuit generates Switching Power Supply output signal according to the output voltage.
According to the third aspect of the invention we, a kind of suppressing method of surge current is provided, comprising:
The moment is powered in signal input part, be connected between the signal input part and signal output end first is led
Path is maintained at off state；
It is charged by the second guiding path to the load capacitance for being connected to the signal output end using input signal,
The signal output end provides output voltage；And
Control module receives the output voltage and generates control signal, when the output voltage is more than or equal to predetermined value
When, the first guiding path conducting.
The suppressing method of a kind of protection circuit, switch power supply system and the surge current that provide according to the present invention, passes through
Control module controls the first guiding path and is connected when output voltage is more than or equal to certain value, efficiently reduces the wave in circuit
Electric current is gushed, has achieved the purpose that the reliability for improving circuit.
Detailed description of the invention
By referring to the drawings to the description of the embodiment of the present invention, above-mentioned and other purposes feature of the invention and excellent
Point will be apparent from.
Fig. 1 shows the structural schematic diagram of prior art electrification circuit.
Fig. 2 shows the surge current schematic diagram of prior art electrification circuit at work.
Fig. 3 shows the structural schematic diagram of the protection circuit of the embodiment of the present invention.
Fig. 4 shows the working sequence schematic diagram of the protection circuit of the embodiment of the present invention.
Fig. 5 shows the effect diagram of the protection circuit of the embodiment of the present invention.
Fig. 6 shows the switch power supply system schematic diagram of the embodiment of the present invention.
Specific embodiment
Hereinafter reference will be made to the drawings, and the present invention will be described in more detail.In various figures, identical element is using similar attached
Icon is remembered to indicate.For the sake of clarity, the various pieces in attached drawing are not necessarily to scale.Furthermore, it is possible to be not shown certain
Well known part.
Many specific details of the invention are described hereinafter, to be more clearly understood that the present invention.But as this
The technical staff in field it will be appreciated that as, can not realize the present invention according to these specific details.
Fig. 3 shows the schematic block diagram of the protection circuit of the embodiment of the present invention.In the following description, the source electrode of transistor
(the first path terminal) can be interchanged as needed with drain electrode (alternate path end).
As shown in figure 3, the protection circuit of the embodiment of the present invention has signal input part and signal output end, signal input part
For receiving input voltage vin, signal output end is used to provide output voltage Vout to load Loading, wherein load
The equivalent circuit of Loding includes capacitor C1 and resistance R5 in parallel.Protecting circuit includes: the first guiding path, the second guiding path
Diameter, control module 110, switch SW1 and fuse FUSE1.Wherein, the first guiding path includes the first transistor Q1 and first
Resistance R1, the second guiding path include second resistance R2, and control module 110 is including second transistor Q2 and by 3rd resistor R3
With the bleeder circuit of the 4th resistance R4 composition.
First guiding path is connected between signal input part and signal output end, the second guiding path and the first guiding path
Diameter is in parallel, and control module 110 is connected with signal output end and the first guiding path, and switch SW1 connects company with fuse FUSE1
It connects, input signal Vin is provided to signal input part through switch SW1 and fuse FUSE1.Specifically, the source of the first transistor Q1
Pole and drain electrode are connected with signal input part and signal output end respectively, the first end of first resistor R1 and the grid of the first transistor Q1
Pole connection, the second end of first resistor R1 are connected with signal input part.Second resistance R2 is connected to signal input part and signal is defeated
Between outlet.3rd resistor R3 and the 4th resistance R4 are serially connected between signal output end and ground, the grid of second transistor Q2 with
Intermediate node D between 3rd resistor R3, the 4th resistance R4 is connected, the source electrode ground connection of second transistor Q2, second transistor Q2
Drain electrode connect with the grid of the first transistor Q1.
In the present embodiment, for the conducting resistance of the first guiding path less than the conducting resistance of the second guiding path, first is brilliant
Body pipe Q1 with P-type channel, second transistor Q2 have N-type channel, in some preferred embodiments, the first transistor Q1 and
Second transistor Q2 is enhanced metal-oxide-semiconductor.
Fig. 4 shows the working sequence schematic diagram of the protection circuit of the embodiment of the present invention.Below in conjunction with Fig. 3 and Fig. 4 couples
The working principle of the protection circuit of the embodiment of the present invention is described in detail.
In the present embodiment, since the first transistor Q1 has P-channel, second transistor Q2 has N-type channel, therefore the
For the cut-in voltage of one transistor Q1 less than 0, the cut-in voltage of second transistor Q2 is greater than 0.
First guiding path signal input part to power on the moment in an off state, the second guiding path is used for according to letter
The input signal Vin that number input terminal provides charges to the load capacitance C1 for being connected to signal output end, and control module 110 is used for root
Control signal is generated according to the output voltage Vout that signal output end provides, when output voltage Vout is more than or equal to predetermined value, is made
The turn-on condition that signal meets the first guiding path is controlled, the first guiding path of signal conduction is controlled.
In the first period T1, the second end of first resistor R1 receives upper pull-up voltage or actuation voltage in signal input part
Power on shutdown the first transistor Q1 constantly, wherein the second end of first resistor R1 is connected to incite somebody to action with the source electrode of the first transistor Q1
Input signal Vin is as upper pull-up voltage.Electric current in circuit can only flow to rear class by second resistance R2, produce in signal output end
Raw output voltage Vout, and charge to the load capacitance C1 for being located at signal output end, output voltage Vout slowly rises.Synchronous
Bleeder circuit is used to carry out dividing to output voltage Vout and be divided in the intermediate node D of 3rd resistor R3 and the 4th resistance R4
Piezoelectricity presses Vd, and the grid of second transistor Q2 receives branch pressure voltage Vd, and the source electrode of second transistor Q2 receives ground reference, the
The drain electrode of two-transistor Q2 is for controlling signal Vctrl, and the grid of the first transistor Q1 receives control signal Vctrl, due to output
Voltage Vout slowly rises, and branch pressure voltage Vd also slowly rises.
In the second period T2, when branch pressure voltage Vd reaches the cut-in voltage of second transistor Q2, second transistor Q2 is led
It is logical.It controls signal Vctrl and the voltage of the first transistor Q1 grid is pulled down to cut-in voltage, so that the first transistor Q1 be made to lead
Logical, the electric current in circuit flows to rear class via the first transistor Q1.
In power up, the first guiding path is controlled by control module 110 and is more than or equal to predetermined value in output voltage
When be connected, efficiently reduce the surge current in circuit, achieved the purpose that improve circuit reliability.
Fig. 5 shows the effect diagram of the protection circuit of the embodiment of the present invention.
In conjunction with Fig. 3 with as shown in figure 5, when output voltage Vout reaches or surpasses predetermined value, second transistor Q2, first
Transistor Q1 is sequentially turned on, and the electric current Iout in circuit only has 1.76A at this time, and second transistor Q2, the first transistor Q1
Turn-on instant can be realized by adjusting the resistance value of first resistor R3 and second resistance R4 in bleeder circuit, to prevent predetermined value mistake
Greatly, rear portion load circuit, which starts operation, causes voltage to decline, and the first transistor Q1 is caused to turn off again.
In the present embodiment, since surge current reduces, surge current is less than work electricity when load works normally at this time
Stream, operating current when being worked normally using loading select corresponding fuse FUSE1, protection load as reference standard.
Fig. 6 shows the power supply unit schematic diagram of the embodiment of the present invention.
As shown in fig. 6, the power supply unit of the embodiment of the present invention includes: protection circuit 100, power supply module 200 and power supply
Switching circuit 300.Wherein, protect the structure & working mechanism of circuit 100 as described above, repeating no more.Power supply module 200 provides
Input signal, switching power circuit generate Switching Power Supply output signal according to output voltage.
In the present embodiment, since surge current reduces, surge current is less than work electricity when load works normally at this time
Stream, operating current when being worked normally using loading select corresponding fuse FUSE1, protection load as reference standard.
The embodiment of the invention also provides a kind of suppressing methods of surge current will at the moment that powers on of signal input part
The first guiding path being connected between signal input part and signal output end is maintained at off state；Passed through using input signal
Second guiding path charges to the load capacitance for being connected to signal output end, and signal output end provides output voltage；Control
Module receives output voltage and generates control signal, when output voltage makes the turn-on condition for controlling signal the first guiding path of satisfaction
When, i.e., when control signal reaches the cut-in voltage of the second guiding path, the conducting of the second guiding path.
It should be noted that herein, relational terms such as first and second and the like are used merely to a reality
Body or operation are distinguished with another entity or operation, are deposited without necessarily requiring or implying between these entities or operation
In any actual relationship or order or sequence.Moreover, the terms "include", "comprise" or its any other variant are intended to
Non-exclusive inclusion, so that the process, method, article or equipment including a series of elements is not only wanted including those
Element, but also including other elements that are not explicitly listed, or further include for this process, method, article or equipment
Intrinsic element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that
There is also other identical elements in process, method, article or equipment including the element.
It is as described above according to the embodiment of the present invention, these embodiments details all there is no detailed descriptionthe, also not
Limiting the invention is only the specific embodiment.Obviously, as described above, can make many modifications and variations.This explanation
These embodiments are chosen and specifically described to book, is principle and practical application in order to better explain the present invention, thus belonging to making
Technical field technical staff can be used using modification of the invention and on the basis of the present invention well.The present invention is only by right
The limitation of claim and its full scope and equivalent.
Claims (10)
1. a kind of protection circuit characterized by comprising
First guiding path, is connected between signal input part and signal output end, and first guiding path is in the signal
Input terminal to power on the moment in an off state；
Second guiding path, input signal for according to the signal input part provided in parallel with first guiding path
It charges to the load capacitance for being connected to the signal output end；And
Control module is connected with the signal output end and first guiding path, for being mentioned according to the signal output end
The output voltage of confession generates control signal, when the output voltage is more than or equal to predetermined value, described in the control signal conduction
First guiding path.
2. protection circuit according to claim 1, which is characterized in that the conducting resistance of first guiding path is less than institute
State the conducting resistance of the second guiding path.
3. protection circuit according to claim 1, which is characterized in that first guiding path includes:
The first transistor, the first path terminal and alternate path end respectively with the signal input part and the signal output end phase
Even, the control terminal of the first transistor receives the control signal；And
First resistor, first end are connect with the control terminal of the first transistor, and second end receives upper pull-up voltage or actuation voltage
To turn off the first transistor constantly in powering on for the signal input part.
4. protection circuit according to claim 3, which is characterized in that the first transistor has a P-type channel, and described the
The second end of one resistance is connected so that the input signal is electric as the pull-up with the first path terminal of the first transistor
Pressure.
5. protection circuit according to claim 3, which is characterized in that the control module includes:
Second transistor has N-type channel, and the first path terminal receives ground reference, and alternate path end is to the first crystal
The control terminal of pipe provides the control signal；
Bleeder circuit obtains branch pressure voltage, the first end of the bleeder circuit and institute for being divided to the output voltage
The first path terminal connection of second transistor is stated, the second end of the bleeder circuit is connect with the signal output end, and described point
The middle-end of volt circuit is connect with the control terminal of the second transistor, for the branch pressure voltage to be provided to second crystal
The control terminal of pipe.
6. protecting circuit according to claim 5, which is characterized in that the bleeder circuit includes concatenated 3rd resistor and
Four resistance, intermediate node of the middle-end of the bleeder circuit between the 3rd resistor and the 4th resistance, the third
Resistance and the 4th resistance are connected between the first end and second end of the bleeder circuit.
7. protection circuit according to claim 1, which is characterized in that second guiding path includes:
Second resistance is connected between the signal input part and the signal output end.
8. protection circuit according to claim 4, which is characterized in that the protection circuit further includes switch and fuse,
The switch is connected in series with the fuse, and the input signal is provided to through the switch with the fuse described
Signal input part.
9. a kind of switch power supply system characterized by comprising
Protection circuit as claimed in any one of claims 1 to 8；
Power supply module provides the input signal；
Switching power circuit generates Switching Power Supply output signal according to the output voltage.
10. a kind of suppressing method of surge current characterized by comprising
The moment is powered in signal input part, the first guiding path that will be connected between the signal input part and signal output end
Diameter is maintained at off state；
It is charged by the second guiding path to the load capacitance for being connected to the signal output end using input signal, it is described
Signal output end provides output voltage；And
Control module receives the output voltage and generates control signal, when the output voltage is more than or equal to predetermined value, institute
State the conducting of the first guiding path.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910080213.2A CN109768697A (en) | 2019-01-28 | 2019-01-28 | Protect the suppressing method of circuit, switch power supply system and surge current |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910080213.2A CN109768697A (en) | 2019-01-28 | 2019-01-28 | Protect the suppressing method of circuit, switch power supply system and surge current |
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| Publication Number | Publication Date |
|---|---|
| CN109768697A true CN109768697A (en) | 2019-05-17 |
Family
ID=66455485
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910080213.2A Pending CN109768697A (en) | 2019-01-28 | 2019-01-28 | Protect the suppressing method of circuit, switch power supply system and surge current |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112908277A (en) * | 2021-02-03 | 2021-06-04 | 重庆先进光电显示技术研究院 | Gate-on voltage output control circuit, gate-less driving device and display device |
| CN113054828A (en) * | 2019-12-26 | 2021-06-29 | 圣邦微电子（北京）股份有限公司 | Drive circuit and electrical power generating system of power switch tube |
| CN113937743A (en) * | 2021-10-18 | 2022-01-14 | 深圳英恒电子有限公司 | Impulse current suppression circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008141894A (en) * | 2006-12-04 | 2008-06-19 | Mitsubishi Electric Corp | Rush current preventing circuit |
| CN205407576U (en) * | 2016-02-17 | 2016-07-27 | 广州广电运通金融电子股份有限公司 | Power delays start control device and mains operated circuit |
| CN108879629A (en) * | 2018-07-10 | 2018-11-23 | 深圳市睿珑科技有限公司 | A kind of lithium battery charger output anti-surge circuit |
-
2019
- 2019-01-28 CN CN201910080213.2A patent/CN109768697A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008141894A (en) * | 2006-12-04 | 2008-06-19 | Mitsubishi Electric Corp | Rush current preventing circuit |
| CN205407576U (en) * | 2016-02-17 | 2016-07-27 | 广州广电运通金融电子股份有限公司 | Power delays start control device and mains operated circuit |
| CN108879629A (en) * | 2018-07-10 | 2018-11-23 | 深圳市睿珑科技有限公司 | A kind of lithium battery charger output anti-surge circuit |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113054828A (en) * | 2019-12-26 | 2021-06-29 | 圣邦微电子（北京）股份有限公司 | Drive circuit and electrical power generating system of power switch tube |
| CN112908277A (en) * | 2021-02-03 | 2021-06-04 | 重庆先进光电显示技术研究院 | Gate-on voltage output control circuit, gate-less driving device and display device |
| CN113937743A (en) * | 2021-10-18 | 2022-01-14 | 深圳英恒电子有限公司 | Impulse current suppression circuit |
| CN113937743B (en) * | 2021-10-18 | 2024-05-14 | 深圳英恒电子有限公司 | Impact current suppression circuit |
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Address after: 215301, 1, Longteng Road, Kunshan, Jiangsu, Suzhou Applicant after: InfoVision Optoelectronics(Kunshan)Co.,Ltd. Address before: 215301, 1, Longteng Road, Kunshan, Jiangsu, Suzhou Applicant before: INFOVISION OPTOELECTRONICS (KUNSHAN) Co.,Ltd. |
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Application publication date: 20190517 |