CN102315631A - Uninterrupted inrush current protection circuit - Google Patents
Uninterrupted inrush current protection circuit Download PDFInfo
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- CN102315631A CN102315631A CN201110308341A CN201110308341A CN102315631A CN 102315631 A CN102315631 A CN 102315631A CN 201110308341 A CN201110308341 A CN 201110308341A CN 201110308341 A CN201110308341 A CN 201110308341A CN 102315631 A CN102315631 A CN 102315631A
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- inrush current
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Abstract
The invention provides an uninterrupted inrush current protection circuit, which comprises a load (40) and a power supply (45), wherein a capacitor (51) is connected with the front part of the load (40) in parallel; a nonlinear resistor MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor) (63) is connected with the power supply (45), the capacitor (51) and a circuit of the load (40); another pin of the nonlinear resistor MOSFET (63) is connected with control circuits (62) and (44); a sampling resistor (21) and a capacitor (22) are arranged at the front ends of the control circuits (44) and (62); and another two ends of the control circuits (44) and (62) are connected to the power supply (45) in parallel. The nonlinear controllable resistor is connected with the circuit in series; the resistance of the nonlinear resistor is actively changed by detecting the power supply to be positioned in different states; when the power supply is electrified at the beginning and inrush current is heavy, the nonlinear resistor is positioned in a state with higher resistance, then the nonlinear resistance is gradually reduced and finally, the nonlinear resistor is positioned at a lower resistance, and the system is positioned in a stable work state.
Description
Technical field
The present invention relates to current protecting circuit, specifically is to have the continual inrush current protective circuit of lasting defencive function.
Background technology
In general, power supply changeover device is the output that a kind of power supply of voltage is changed into other a kind of voltage, to satisfy design requirement; But, when just having powered on, have very big input current to produce owing to power supply changeover device; Be inrush current, its electric current is much larger than the electric current of operate as normal, and this improper electric current all produces when powering at every turn; Long-term use can cause power supply changeover device, and filter capacitor and bridge rectifier pipe damage; Level power supply has the output excess current protective function before some simultaneously, and in this case, inrush current can cause restarting of preceding level power supply greater than prime power protection electric current or close.
For the inrush current protection, can adopt resistance class device as protective circuit, U.S. Pat 6,297 is arranged; 979B1 adopts this kind protective circuit, in this patent, mentions, and adopts a negative temperature parameter circuit to be connected in the loop; Powering in system, up till now resistance was very big, reached unexpected current protection, and electric current is through resistance then; Resistance heating, resistance diminishes, and accomplishes via design; But this kind is designed with a defective exactly when powering on immediately after the outage behind the power work again, and this moment, temperature coefficient of resistance was in the low resistance resistance, so just can not reach unexpected current protection.
Summary of the invention
The object of the present invention is to provide a kind of continual inrush current protective circuit that has.Not only can the normality startup be issued to the inrush current defencive function, under the moving state of of short duration power-off restarting, also can reach the inrush current defencive function simultaneously.
In order to achieve the above object; Technical scheme of the present invention does; Continual inrush current protective circuit comprises load (40) and power supply (45), the preceding filter capacitor (51) that is parallel with of load (40); It is characterized in that: in power supply (45) and electric capacity (51) and load (40) loop, be in series with nonlinear resistance (63), another pin of nonlinear resistance (63) is connected with control circuit (62), (44).
Improvement to such scheme is: the front end in control circuit (44), (62) is provided with sample resistance (21), electric capacity (22) again, and the two ends in addition of sample resistance (21), electric capacity (22) are connected in parallel to power supply (45).
Improvement to such scheme is: described nonlinear resistance (63) adopts the MOSFET circuit.
Improvement to such scheme is: outside sample resistance (21), electric capacity (22), be parallel with voltage regulation resistance (37) and voltage-stabiliser tube (38) again, middle link is connected with filtering generator (84) and amplifying circuit (73) again to nonlinear resistance MOSFET (63).
Beneficial effect:
The present invention adopts in the non-linear controllable resistor series connection in the loop, is under the different conditions through detecting power supply, initiatively changes the resistance of nonlinear resistance; At the beginning of power supply electrifying, when inrush current was bigger, nonlinear resistance was in the resistance higher state; Thereupon; Non-linear resistance diminishes gradually, and this nonlinear resistance is in low resistance at last, and system is in steady-working state.
Description of drawings
Fig. 1 is a circuit diagram of the present invention.
Fig. 2 is the more accurate circuit diagram of Fig. 1 of the present invention.
45 power supplys, 51 electric capacity, 40 loads, 63 nonlinear resistance MOSFET, 62,44 control circuits, 21 sample resistances, 22 electric capacity, 37 voltage regulation resistances, 38 voltage-stabiliser tubes, 84 filtering generators, 73 amplifying circuits.
Embodiment
The present invention is like Fig. 1, shown in 2.
According to protective circuit of the present invention, its design principle is to adopt a non-linear controllable resistor to be connected in the loop, in different phase, controls its resistance value, to reach system's smooth starting, the control inrush current.When system powered on, non-linear controllable resistor was in the resistance higher state, can suppress inrush current, through external control, regulated non-linear controllable resistor resistance to low resistance, was in normal operating conditions.
Shown in Figure 1, in power supply 45 and electric capacity 51 and load 40 loops, be in series with nonlinear resistance MOSFET63, another pin of nonlinear resistance MOSFET63 is connected with control circuit 62,44; Front end at control circuit 44,62 is provided with sample resistance 21, electric capacity 22 again, and the two ends in addition of sample resistance 21, electric capacity 22 are connected in parallel to power supply 45.
Nonlinear resistance adopts MOSFET 63, is connected in the loop, realizes suppressing inrush current through the conducting resistance that changes nonlinear resistance MOSFET63; If under the situation that does not have nonlinear resistance MOSFET63, when system powered on, power supply 45 formed instantaneous loop with electric capacity 51; Just have a very big inrush current, but when sealing in controllable non-linear resistance MOSFET63 in the loop, when system powers on; Power supply 45; Electric capacity 51 and nonlinear resistance MOSFET63 form an instantaneous loop, and this moment, control circuit 44 and 62 made nonlinear resistance MOSFET63 sentence a state that resistance is higher, so just can effectively suppress inrush current; When being charged to a certain degree along with electric capacity 51; Control circuit 44 and 62 control nonlinear resistance MOSFET63; Make it resistance and diminish gradually, electric capacity 51 completion of also charging, last nonlinear resistance MOSFET63 is in the low on-resistance state; Power supply 45, load 40 and nonlinear resistance MOSFET63 form a work loop.
lgτ1=k*lgτ2
Can draw the charge constant in inrush current loop through the timeconstant 1 of sample circuit like this; Therefore the charge constant that reflects inrush current with the timeconstant 1 of sample circuit; Foundation as the control nonlinear resistance; Produce the corresponding waveform of control, reach the purpose of control inrush current with this.
Fig. 2 is parallel with voltage regulation resistance 37 and voltage-stabiliser tube 38 again outside sample resistance 21, electric capacity 22, middle link is connected with filtering generator 84 and amplifying circuit 73 again to nonlinear resistance MOSFET63.
Filtering generator 84 and amplifying circuit 73 can be realized the waveform of the complicacy that the control circuit output voltage is controlled, and to reach control more accurately, its foundation that produces control waveform is the sampling to sample resistance 21 and electric capacity 22 charging circuits; Amplifying circuit 37 is to be used for working power to control circuit being provided with filtering generator 38.
Claims (4)
1. continual inrush current protective circuit; Comprise load (40) and power supply (45); The preceding filter capacitor (51) that is parallel with of load (40); It is characterized in that: in power supply (45) and filter capacitor (51) and load (40) loop, be in series with nonlinear resistance (63), another pin of nonlinear resistance (63) is connected with control circuit (62), (44).
2. continual inrush current protective circuit as claimed in claim 1; It is characterized in that: the front end in control circuit (44), (62) is provided with sample resistance (21), electric capacity (22) again, and the two ends in addition of sample resistance (21), electric capacity (22) are connected in parallel to power supply (45).
3. continual inrush current protective circuit as claimed in claim 1 is characterized in that: described nonlinear resistance (63) adopts the MOSFET circuit.
4. like claim 1 or 3 described continual inrush current protective circuits; It is characterized in that: outside sample resistance (21), electric capacity (22), be parallel with voltage regulation resistance (37) and voltage-stabiliser tube (38) again, middle link is connected with filtering generator (84) and amplifying circuit (73) again to nonlinear resistance MOSFET (63).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110308341A CN102315631A (en) | 2011-10-13 | 2011-10-13 | Uninterrupted inrush current protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110308341A CN102315631A (en) | 2011-10-13 | 2011-10-13 | Uninterrupted inrush current protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102315631A true CN102315631A (en) | 2012-01-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110308341A Pending CN102315631A (en) | 2011-10-13 | 2011-10-13 | Uninterrupted inrush current protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102315631A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10243555A (en) * | 1997-02-21 | 1998-09-11 | Oki Electric Ind Co Ltd | Inrush current limiting circuit |
| CN101505055A (en) * | 2008-12-30 | 2009-08-12 | 上海英联电子系统有限公司 | Active surge current control circuit |
| CN101582580A (en) * | 2009-06-09 | 2009-11-18 | 广州金升阳科技有限公司 | Input/output over-voltage protection circuit |
| CN201576933U (en) * | 2009-12-15 | 2010-09-08 | 北京遥测技术研究所 | Circuit capable of restraining instant surge current produced during startup |
| CN202260429U (en) * | 2011-10-13 | 2012-05-30 | 湖北汽车工业学院 | Uninterrupted inrush current protective circuit |
-
2011
- 2011-10-13 CN CN201110308341A patent/CN102315631A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10243555A (en) * | 1997-02-21 | 1998-09-11 | Oki Electric Ind Co Ltd | Inrush current limiting circuit |
| CN101505055A (en) * | 2008-12-30 | 2009-08-12 | 上海英联电子系统有限公司 | Active surge current control circuit |
| CN101582580A (en) * | 2009-06-09 | 2009-11-18 | 广州金升阳科技有限公司 | Input/output over-voltage protection circuit |
| CN201576933U (en) * | 2009-12-15 | 2010-09-08 | 北京遥测技术研究所 | Circuit capable of restraining instant surge current produced during startup |
| CN202260429U (en) * | 2011-10-13 | 2012-05-30 | 湖北汽车工业学院 | Uninterrupted inrush current protective circuit |
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20120111 |