CN105515363A - Power supply circuit and soft starting circuit thereof - Google Patents
Power supply circuit and soft starting circuit thereof Download PDFInfo
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- CN105515363A CN105515363A CN201410495338.9A CN201410495338A CN105515363A CN 105515363 A CN105515363 A CN 105515363A CN 201410495338 A CN201410495338 A CN 201410495338A CN 105515363 A CN105515363 A CN 105515363A
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Abstract
The invention relates to a power supply circuit and a soft starting circuit thereof. The soft starting circuit comprises a first and second charging transistors, a first and second capacitors, and a clamp P type transistor, wherein the first charging transistor is conducted according to a drive pulse, and provides a first charging current at preset intervals, and enables a first output voltage of a first output end to rise gradually after the first capacitor receives the first charging current; the second charging transistor is conducted according to the first output voltage so as to provide a second charging current to a second output end and enable a second output voltage of the second output end to rise gradually after the second capacitor receives the second charging current; the clamp P type transistor includes a source terminal which is electrically connected with a clamp terminal, a drain terminal which is electrically connected with a ground potential, and a grid terminal which is electrically connected with the second output end; and when the voltage at the clamp terminal exceeds a clamp critical value, the xxx is conducted so as to decrease the voltage at the clamp terminal.
Description
Technical field
The present invention relates to a kind of circuit engineering, and relate to a kind of power supply circuit and soft starting circuit thereof especially.
Background technology
Power supply device plays important role in the present computer technology.In different power supply devices, dc-dc conversion pressurizer (DC-DCswitchingregulator) is very common, and is often used to provide galvanic current potential source in electronic building brick.
But when startup, the part node in dc-dc conversion voltage regulator circuit may cause voltage to raise due to the generation of a large amount of burst current, makes device damage further.
Therefore, how designing a new power supply circuit and soft starting circuit thereof, to solve the above problems, is industry problem demanding prompt solution.
Summary of the invention
Therefore, the technical problem to be solved in the present invention is to provide a kind of soft starting circuit, comprises: the first charging transistor, the first electric capacity, the second charging transistor, the second electric capacity and clamp (clamping) P-type crystal pipe.The conducting according to multiple driving pulse of first charging transistor, to provide the first charging current to the first output every Preset Time.First electric capacity is electrically connected at the first output, to receive the first charging current, makes the first output voltage of the first output progressively increase.The conducting according to the first output voltage of second charging transistor, to provide the second charging current to the second output.Second electric capacity is electrically connected at the second output, to receive the second charging current, makes the second output voltage of the second output progressively increase.Clamp P-type crystal pipe comprises the source terminal being electrically connected at clamp end, the drain electrode end being electrically connected at earthing potential and is electrically connected at the gate terminal of the second output, wherein clamp P-type crystal pipe conducting when the voltage of clamp end exceedes clamp critical value, to drag down the voltage of clamp end.
According to one embodiment of the invention, soft starting circuit also comprises level pressure load, is electrically connected at the first output, exceedes maximal voltage level to prevent the first output voltage.
According to another embodiment of the present invention, wherein level pressure load comprises the multiple diodes be in series.
According to another embodiment of the present invention, wherein clamp critical value is the critical voltage sum of the second output voltage and clamp P-type crystal pipe.
According to another embodiment of the present invention, wherein clamp end is the amplifier out of the operational amplifier be arranged in voltage conversion circuit.
According to the embodiment that the present invention also has, wherein voltage conversion circuit comprises low-voltage-drop linear voltage regulator (lowdropoutregulator), boosting (boost) circuit, step-down (buck) circuit or charge pump (chargepump) circuit.
According to the embodiment that the present invention also has, soft starting circuit also comprises the first discharge transistor, be electrically connected at the first output, wherein when the short-circuit state of voltage conversion circuit is detected, the first discharge transistor is activated to discharge to the first output.
According to one embodiment of the invention, wherein voltage conversion circuit also comprises short-circuit detecting module, in order to detect the short-circuit state of voltage conversion circuit, to start the first discharge transistor in time short-circuit state being detected.
According to another embodiment of the present invention, soft starting circuit also comprises the second discharge transistor, be electrically connected at the second output, to continue to discharge to the second output, wherein the charging ability of the second charging transistor is greater than the discharge capability of the second discharge transistor.
According to another embodiment of the present invention, wherein driving pulse is provided by single triggering (one-shot) circuit.
Another technical problem that the present invention will solve is to provide a kind of power supply circuit, comprises: voltage conversion circuit and soft starting circuit.Voltage conversion circuit comprises the operational amplifier with feedback arrangement, and operational amplifier comprises amplifier out.Soft starting circuit comprises: the first charging transistor, the first electric capacity, the second charging transistor, the second electric capacity and clamp P-type crystal pipe.The conducting according to multiple driving pulse of first charging transistor, to provide the first charging current to the first output every Preset Time.First electric capacity is electrically connected at the first output, to receive the first charging current, makes the first output voltage of the first output progressively increase.The conducting according to the first output voltage of second charging transistor, to provide the second charging current to the second output.Second electric capacity is electrically connected at the second output, to receive the second charging current, makes the second output voltage of the second output progressively increase.Clamp P-type crystal pipe comprises the source terminal being electrically connected at amplifier out, the drain electrode end being electrically connected at earthing potential and is electrically connected at the gate terminal of the second output, wherein clamp P-type crystal pipe conducting when the voltage of amplifier out exceedes clamp critical value, to drag down the voltage of amplifier out.
According to one embodiment of the invention, soft starting circuit also comprises level pressure load, is electrically connected at the first output, exceedes maximal voltage level to prevent the first output voltage.
According to another embodiment of the present invention, wherein level pressure load comprises the multiple diodes be in series.
According to another embodiment of the present invention, wherein clamp critical value is the critical voltage sum of the second output voltage and clamp P-type crystal pipe.
According to another embodiment of the present invention, wherein voltage conversion circuit comprises low-voltage-drop linear voltage regulator, booster circuit, reduction voltage circuit or charge pump circuit.
According to the embodiment that the present invention also has, soft starting circuit also comprises the first discharge transistor, be electrically connected at the first output, wherein when the short-circuit state of voltage conversion circuit is detected, the first discharge transistor is activated to discharge to the first output.
According to the embodiment that the present invention also has, wherein voltage conversion circuit also comprises short-circuit detecting module, in order to detect the short-circuit state of voltage conversion circuit, to start the first discharge transistor in time short-circuit state being detected.
According to one embodiment of the invention, soft starting circuit also comprises the second discharge transistor, is electrically connected at the second output, and to continue to discharge to the second output, wherein the charging ability of the second charging transistor is greater than the discharge capability of the second discharge transistor.
According to another embodiment of the present invention, wherein driving pulse is provided by single-shot trigger circuit.
Application the invention has the advantages that the design by soft starting circuit, the conducting controlling the first charging transistor with driving pulse makes the first output voltage of the first output progressively rise, and then make the second charging transistor conducting with the second output voltage of lifting second output, finally make the clamp end of clamp P-type crystal pipe allow the maximum voltage value reached to rise gradually, and realize the mechanism of soft start.
Accompanying drawing explanation
Fig. 1 is in one embodiment of the invention, a kind of circuit diagram of soft starting circuit;
Fig. 2 is in one embodiment of the invention, a kind of circuit diagram of power supply circuit; And
Fig. 3 A and Fig. 3 B is respectively the oscillogram of voltage under different short-circuit protection mechanism of clamp end.
Description of reference numerals
1: soft starting circuit
100: the first charging transistors
101: driving pulse
102: the first electric capacity
104: the second charging transistors
106: the second electric capacity
108: clamp P-type crystal pipe
110: resistance
112: level pressure load
114: diode
116: discharge transistor
118: resistance
120: discharge transistor
20: voltage conversion circuit
200: low-voltage-drop linear voltage regulator
202: operational amplifier
Embodiment
Please refer to Fig. 1.Fig. 1 is in one embodiment of the invention, a kind of circuit diagram of soft starting circuit 1.Soft starting circuit 1 comprises: the first charging transistor 100, first electric capacity 102, second charging transistor 104, second electric capacity 106 and clamp P-type crystal pipe 108.
In the present embodiment, the first charging transistor 100 as shown in Figure 1, is P-type crystal pipe.The grid of the first charging transistor 100 receives multiple driving pulse 101, with the conducting according to driving pulse 101, and provides the first charging current I1 to the first output O1 when conducting every Preset Time.In one embodiment, the first charging current I1 is sent to the first output O1 via the resistance 110 being electrically connected at the first charging transistor 100.
In one embodiment, driving pulse 101 produced every Preset Time by a single-shot trigger circuit (not shown), and driving pulse 101 is low state pulses, to make the first charging transistor 100 conducting of P type.
First electric capacity 102 is electrically connected at the first output O1, to receive the first charging current I1.Therefore, the first output voltage V1 of the first output O1, by the charging behavior due to the first charging current I1, progressively rises every Preset Time stepped ground.
In one embodiment, soft starting circuit 1 optionally comprises level pressure load 112.Level pressure load 112 is electrically connected at the first output O1, exceedes maximal voltage level to prevent the first output voltage V1.In other words, the first output voltage V1 progressively will rise, until arrive this maximal voltage level due to the first charging current I1.In one embodiment, level pressure load 112 comprises the multiple diodes 114 be in series.Therefore, above-mentioned maximal voltage level, is equivalent to total cross-pressure during these diode 114 conductings.
For actual numerical value, if the diode of single conducting 114 is 0.7 volt, and level pressure load 112 comprises five diodes 114 altogether, then maximal voltage level will equal 0.7x5=3.5 volt.
In the present embodiment, the second charging transistor 104 as shown in Figure 1, is N-type transistor.The grid of the second charging transistor 104 is electrically connected at the first output O1.When the first output voltage V1 of the first output O1 progressively rises, the second charging transistor 104 by conducting gradually, to provide the second charging current I2 to the second output O2.
Second electric capacity 106 is electrically connected at the second output O2, to receive the second charging current I2.Therefore, the charging behavior due to the second charging current I2 is progressively risen by the second output voltage V2 of the second output O2.
In one embodiment, soft starting circuit 1 also comprises discharge transistor 116.Discharge transistor 116 is electrically connected at the second output O2, to continue to discharge to the second output O2.In one embodiment, the charging ability of the second charging transistor 104 is greater than the discharge capability of discharge transistor 116.Therefore, when initial condition, the electric discharge due to discharge transistor 116 is maintained low voltage level by the second output O2.When the second charging transistor 104 is due to the first output voltage V1 conducting gradually, the second charging transistor 104 can provide the second charging current I2 to charge to the second electric capacity 106, and make the second output voltage V2 of the second output O2 increase.
Clamp P-type crystal pipe 108 comprises the source terminal S being electrically connected at clamp end OC, the drain electrode end D being electrically connected at earthing potential GND and is electrically connected at the gate terminal G of the second output O2.In one embodiment, drain electrode end D is optionally electrically connected to earthing potential GND via resistance 118.Clamp end OC is electrically connected to an external circuit (not shown).
Clamp P-type crystal pipe 108 conducting when the voltage Voc of clamp end OC exceedes clamp critical value, to drag down the voltage Voc of clamp end OC.In one embodiment, clamp critical value is the critical voltage Vth sum of the second output voltage V2 and clamp P-type crystal pipe 108.More specifically, the relation of voltage Voc, the second output voltage V2 of clamp end OC and the critical voltage Vth of clamp P-type crystal pipe 108 can be expressed from the next:
Voc≦V2+Vth
Therefore, the voltage Voc of clamp end OC can be clamped at the magnitude of voltage being equivalent to V2+Vth.
In summary, when soft starting circuit 1 comes into operation, the first charging current I1 that the first output voltage V1 will provide due to the first charging transistor 100, and progressively rise in a stepping manner.Further, the second charging current I2 provided due to the second charging transistor 104 progressively rises by the second output voltage V2, and wherein the second charging transistor 104 is conductings due to the first output voltage V1.Therefore, when the second output voltage V2 progressively rises, voltage Voc allow arrive maximum, also will rise thereupon.Therefore, above-mentioned mode can realize the soft start mechanism of the voltage Voc of clamp end OC.
It is noted that the first charging transistor 100 also can be realized by N-type transistor.Now driving pulse 101 will be high pulse, to make the first charging transistor 100 conducting of N-type.Further, the second charging transistor 104 also after the circuit design suitably adjusting soft starting circuit 1, can be realized by P-type crystal pipe.
Fig. 2 is in one embodiment of the invention, a kind of circuit diagram of power supply circuit 2.Power supply circuit 2 comprises the soft starting circuit 1 shown in Fig. 1 and voltage conversion circuit 20.
Soft starting circuit 1 comprises in fact assembly same as shown in Figure 1.Therefore, identical in circuit assembly will no longer be discussed to its details.In the present embodiment, soft starting circuit 1 also comprises the discharge transistor 120 being electrically connected at the first output O1.Wherein, discharge transistor 120 when conducting, can discharge to the first output O1.
In the present embodiment, voltage conversion circuit 20 comprises low-voltage-drop linear voltage regulator 200, and this low-voltage-drop linear voltage regulator 200 comprises operational amplifier 202.Operational amplifier 202 is comprise feedback arrangement, and comprises the amplifier out OA being electrically connected at clamp end OC.
The various circuit topology that low-voltage-drop linear voltage regulator 200 can be known by those skilled in the art realize, not by the structure shown in Fig. 2 is limit.Further, in other embodiments, voltage conversion circuit 20 also can comprise booster circuit, reduction voltage circuit or charge pump circuit.
Therefore, soft starting circuit 1 will provide voltage conversion circuit 20, particularly in voltage conversion circuit 20, and the mechanism of an amplifier out OA soft start of the operational amplifier 202 of low-voltage-drop linear voltage regulator 200.
Further, voltage conversion circuit 20 comprises short-circuit detecting module 204, in order to detect the situation whether voltage conversion circuit 20 is short-circuited.When short-circuit state being detected, star t-up discharge transistor 120 discharges to the first output O1 by voltage conversion circuit 20.
Therefore, the electric discharge behavior due to discharge transistor 120 reduces by the first output voltage V1 of the first output O1.Second charging transistor 104 will then be closed, and the existence due to discharge transistor 116 reduces by the second output voltage V2 of the second output O2.Because clamp critical value is described above, relevant to the second output voltage V2, therefore the voltage Voc of clamp end OC will be dragged down further because exceeding clamp critical value.
Therefore, aforesaid way can realize the short-circuit protection mechanism in power supply circuit 2, burns because of short circuit to avoid voltage conversion circuit 20.
Fig. 3 A and Fig. 3 B is respectively the oscillogram of voltage Voc under different short-circuit protection mechanism of clamp end OC.
In Fig. 3 A, voltage Voc progressively rises, until reach highest voltage level.Wherein, highest voltage level is limited due to the existence of level pressure load 112 that illustrates in Fig. 1 and Fig. 2.When short-circuit state is detected, voltage Voc will be dragged down by clamp P-type crystal pipe 108.Then, voltage Voc rises again until reach highest voltage level.
In Fig. 3 B, carry out and process like Fig. 3 category-A.But in figure 3b, the frequency of carrying out short-circuit detecting is higher.Therefore, if short-circuit state not yet recovers, then rising a period of time is then dragged down by voltage Voc, and anti-multiple times.
Although invention has been described above-mentioned execution mode; but it is also not used to limit content of the present invention, and those skilled in the art, in the spirit and scope not departing from content of the present invention; can be used for a variety of modifications and variations, therefore the protection range of content of the present invention is as the criterion with the claims in the present invention.
Claims (19)
1. a soft starting circuit, comprises:
One first charging transistor, in order to the conducting according to multiple driving pulse, to provide one first charging current to one first output every a Preset Time;
One first electric capacity, is electrically connected at this first output, to receive this first charging current, makes one first output voltage of this first output progressively increase;
One second charging transistor, in order to the conducting according to this first output voltage, to provide one second charging current to one second output;
One second electric capacity, is electrically connected at this second output, to receive this second charging current, makes one second output voltage of this second output progressively increase; And
One clamp P-type crystal pipe, comprise be electrically connected at a clamp end one source pole end, be electrically connected at a drain electrode end of an earthing potential and be electrically connected at a gate terminal of this second output, wherein this clamp P-type crystal pipe in a voltage of this clamp end more than conducting during a clamp critical value, so that this voltage of this clamp end is dragged down.
2. soft starting circuit according to claim 1, also comprises a level pressure load, is electrically connected at this first output, to prevent this first output voltage more than a maximal voltage level.
3. soft starting circuit according to claim 2, wherein this level pressure load comprises the multiple diodes be in series.
4. soft starting circuit according to claim 1, wherein this clamp critical value is a critical voltage sum of this second output voltage and this clamp P-type crystal pipe.
5. soft starting circuit according to claim 1, wherein this clamp end is an amplifier out of the operational amplifier be arranged in a voltage conversion circuit.
6. soft starting circuit according to claim 5, wherein this voltage conversion circuit comprises a low-voltage-drop linear voltage regulator, a booster circuit, a reduction voltage circuit or a charge pump circuit.
7. soft starting circuit according to claim 5, also comprise one first discharge transistor, be electrically connected at this first output, wherein when a short-circuit state of this voltage conversion circuit is detected, this first discharge transistor is activated to discharge to this first output.
8. soft starting circuit according to claim 7, wherein this voltage conversion circuit also comprises a short-circuit detecting module, in order to detect this short-circuit state of this voltage conversion circuit, to start this first discharge transistor in time this short-circuit state being detected.
9. soft starting circuit according to claim 1, also comprise one second discharge transistor, be electrically connected at this second output, to continue to discharge to this second output, wherein a charging ability of this second charging transistor is greater than a discharge capability of this second discharge transistor.
10. soft starting circuit according to claim 1, wherein these driving pulses are provided by a single-shot trigger circuit.
11. 1 power supply circuits, comprise:
One voltage conversion circuit, comprise an operational amplifier with a feedback arrangement, and this operational amplifier comprises an amplifier out; And
One soft starting circuit, comprises:
One first charging transistor, in order to the conducting according to multiple driving pulse, to provide one first charging current to one first output every a Preset Time;
One first electric capacity, is electrically connected at this first output, to receive this first charging current, makes one first output voltage of this first output progressively increase;
One second charging transistor, in order to the conducting according to this first output voltage, to provide one second charging current to one second output;
One second electric capacity, is electrically connected at this second output, to receive this second charging current, makes one second output voltage of this second output progressively increase; And
One clamp P-type crystal pipe, comprise be electrically connected at this amplifier out one source pole end, be electrically connected at a drain electrode end of an earthing potential and be electrically connected at a gate terminal of this second output, wherein this clamp P-type crystal pipe in a voltage of this amplifier out more than conducting during a clamp critical value, so that this voltage of this amplifier out is dragged down.
12. power supply circuits according to claim 11, wherein this soft starting circuit also comprises a level pressure load, is electrically connected at this first output, to prevent this first output voltage more than a maximal voltage level.
13. power supply circuits according to claim 12, wherein this level pressure load comprises the multiple diodes be in series.
14. power supply circuits according to claim 11, wherein this clamp critical value is a critical voltage sum of this second output voltage and this clamp P-type crystal pipe.
15. power supply circuits according to claim 11, wherein this voltage conversion circuit comprises a low-voltage-drop linear voltage regulator, a booster circuit, a reduction voltage circuit or a charge pump circuit.
16. power supply circuits according to claim 11, wherein this soft starting circuit also comprises one first discharge transistor, be electrically connected at this first output, wherein when a short-circuit state of this voltage conversion circuit is detected, this first discharge transistor is activated to discharge to this first output.
17. power supply circuits according to claim 16, wherein this voltage conversion circuit also comprises a short-circuit detecting module, in order to detect this short-circuit state of this voltage conversion circuit, to start this first discharge transistor in time this short-circuit state being detected.
18. power supply circuits according to claim 11, wherein this soft starting circuit also comprises one second discharge transistor, be electrically connected at this second output, to continue to discharge to this second output, wherein a charging ability of this second charging transistor is greater than a discharge capability of this second discharge transistor.
19. power supply circuits according to claim 11, wherein these driving pulses are provided by a single-shot trigger circuit.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410495338.9A CN105515363B (en) | 2014-09-24 | 2014-09-24 | Power supply circuit and its soft starting circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410495338.9A CN105515363B (en) | 2014-09-24 | 2014-09-24 | Power supply circuit and its soft starting circuit |
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| Publication Number | Publication Date |
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| CN105515363A true CN105515363A (en) | 2016-04-20 |
| CN105515363B CN105515363B (en) | 2018-08-28 |
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| CN201410495338.9A Active CN105515363B (en) | 2014-09-24 | 2014-09-24 | Power supply circuit and its soft starting circuit |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106211469A (en) * | 2016-08-24 | 2016-12-07 | 横店集团得邦照明股份有限公司 | A kind of driving means with short-circuit protection circuit and its implementation |
| CN113300586A (en) * | 2021-06-10 | 2021-08-24 | 深圳市微源半导体股份有限公司 | Power tube soft start circuit applied to power management chip |
| CN113949257A (en) * | 2021-10-19 | 2022-01-18 | 珠海智融科技股份有限公司 | Soft start circuit based on average current mode control system |
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| CN2884649Y (en) * | 2006-03-17 | 2007-03-28 | 中国电力科学研究院 | High voltage large capacity pulse current capacitor constant current charger |
| CN102955550A (en) * | 2011-08-25 | 2013-03-06 | 英业达股份有限公司 | Stander type server system |
| CN103543781A (en) * | 2013-10-29 | 2014-01-29 | 西安华芯半导体有限公司 | Low-dropout linear regulator |
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2014
- 2014-09-24 CN CN201410495338.9A patent/CN105515363B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2884649Y (en) * | 2006-03-17 | 2007-03-28 | 中国电力科学研究院 | High voltage large capacity pulse current capacitor constant current charger |
| CN102955550A (en) * | 2011-08-25 | 2013-03-06 | 英业达股份有限公司 | Stander type server system |
| CN103543781A (en) * | 2013-10-29 | 2014-01-29 | 西安华芯半导体有限公司 | Low-dropout linear regulator |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106211469A (en) * | 2016-08-24 | 2016-12-07 | 横店集团得邦照明股份有限公司 | A kind of driving means with short-circuit protection circuit and its implementation |
| CN113300586A (en) * | 2021-06-10 | 2021-08-24 | 深圳市微源半导体股份有限公司 | Power tube soft start circuit applied to power management chip |
| CN113300586B (en) * | 2021-06-10 | 2022-04-01 | 深圳市微源半导体股份有限公司 | Power tube soft start circuit applied to power management chip |
| CN113949257A (en) * | 2021-10-19 | 2022-01-18 | 珠海智融科技股份有限公司 | Soft start circuit based on average current mode control system |
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| CN105515363B (en) | 2018-08-28 |
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