CN106208655B - A kind of reliable access device of low-voltage dc power supply - Google Patents
A kind of reliable access device of low-voltage dc power supply Download PDFInfo
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- CN106208655B CN106208655B CN201610784294.0A CN201610784294A CN106208655B CN 106208655 B CN106208655 B CN 106208655B CN 201610784294 A CN201610784294 A CN 201610784294A CN 106208655 B CN106208655 B CN 106208655B
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- 238000004891 communication Methods 0.000 claims abstract description 35
- 230000000903 blocking effect Effects 0.000 claims abstract description 4
- 238000000465 moulding Methods 0.000 claims 2
- 238000010892 electric spark Methods 0.000 abstract description 2
- 238000007600 charging Methods 0.000 description 8
- 230000005611 electricity Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000001052 transient effect Effects 0.000 description 3
- 230000001960 triggered effect Effects 0.000 description 3
- 239000003990 capacitor Substances 0.000 description 2
- 230000008676 import Effects 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005669 field effect Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 230000011664 signaling Effects 0.000 description 1
Classifications
-
- 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
- H02M1/32—Means for protecting converters other than automatic disconnection
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Direct Current Feeding And Distribution (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The invention discloses a kind of reliable access devices of low-voltage dc power supply, including timer, trigger signal module and power supply delay time control module；When adaper plug is inserted into communication equipment jack moment, DC voltage triggers the timer and enters steady-working state, the timer sets output end height by the trigger signal module, the low level of the trigger signal module output certain time；The power supply delay time control module becomes low and sets by setting the timer output end from height, and control external dc power is with communication equipment by blocking to connection.The present invention realizes plant-grid connection delay by timer, in power adapter plug moment is connected with equipment supply hub, rear end capacitive load is set not yet to access circuit, it avoids forming electric spark between plug and jack, ensure that plug and jack have time enough to complete connection, improves the reliability of plant-grid connection.
Description
Technical field
The present invention relates to data communications equipment communication power supply technologies, and in particular to a kind of low-voltage dc power supply reliably accesses dress
It sets.
Background technology
Currently, small-power desktop type communication equipment mostly uses greatly external power adapter power supply, supply voltage is usually straight
12V is flowed, realizes the power supply of communication equipment by the way that the output plug of adapter is docked with the supply hub of communication equipment.Although this
The power-supply service scheme of sample reduces communication equipment volume and weight, and inside communication equipment is containing only safe voltage, dangerous voltage
It is present in power supply adaptor, improves the safety of communication equipment, increases reliability of communication equipment, and convenient for being set to communication
Standby maintenance, but there is also following for such power-supply service scheme：
(1) under conditions of power supply adaptor is in running order, attaching plug is inserted into communication equipment supply hub,
When plug and jack are switched to by state of insulation and be reliably connected state, there can be a unstable intermediate state of contact, and
There are capacitive load on communication equipment mainboard power rail, the two comprehensive function will cause plug to be inserted into moment, plug and jack it
Between there is spark phenomenon, unstable transient state, such as ring, due to voltage spikes will occur on power supply, this unstable transient state electricity
Pressure may cause the operation irregularity of communication equipment mainboard, or even cause equipment damage.
(2) it since there are the electrolytic capacitors of large capacity on communication equipment mainboard power rail, in control source, will be formed very
Big dash current, which may cause the overcurrent protection of power supply adaptor, the overcurrent at equipment power import is protected
Protect device activity, EMI interference etc..
Invention content
The technical problem to be solved by the present invention is to existing power-supply service scheme there are power supply adaptors in the operating condition,
Is there is into spark phenomenon in attaching plug insertion communication equipment supply hub, causes the operation irregularity of communication equipment mainboard, Yi Ji electricity
When pressure input, big dash current will be formed, causes power supply adaptor and the overcurrent protection action at equipment power import, EMI
The problem of interference.
In order to solve the above-mentioned technical problem, it is reliable to be to provide a kind of low-voltage dc power supply for the technical solution adopted in the present invention
Access device, including timer, trigger signal module and power supply delay time control module；
When adaper plug is inserted into communication equipment jack moment, DC voltage is described to touch by the trigger signal module
Signalling module exports the low level of certain time, triggers the timer and enters steady-working state, the timer
Output end height is set；The power supply delay time control module becomes low and sets by setting the timer output end from height, controls
External dc power processed is with communication equipment by blocking to connection.
In the above scheme, the trigger signal module includes first resistor R1, second resistance R2, first capacitance C1, NPN
Type triode T1 and 3rd resistor R3, wherein：
The first capacitance C1 mono- terminates input voltage anode, another termination one end the first resistor R1；Described first
Another termination one end the second resistance R2 resistance R1 and the NPN type triode T1 base stages；The second resistance R2 other ends
Input voltage cathode is connect with the NPN type triode T1 emitters；NPN type triode T1 collectors respectively with the timer
Low triggering end is connected with the one end the 3rd resistor R3；Another termination input voltage anodes of 3rd resistor R3；
When adaper plug is inserted into communication equipment jack moment, external dc power voltage is by the first resistor R1
The first capacitance C1 chargings, it is three pole of the NPN type that the charging current of the first capacitance C1, which flows through the second resistance R2,
Pipe T1 provides base stage and emitter voltage, chooses appropriate 3rd resistor R3 resistance values so that the NPN type triode T1 enters saturation
Area, then low triggering end be set to low level；When the first capacitance C1 is charged to a certain degree, charging current reduces, and described the
Voltage on two resistance R2 reduces, and NPN triode T1 cut-offs, the low triggering end of the timer is set to high level, and it is fixed to realize
When device low triggering end low level keep, and be finally set to high process.
In the above scheme, the power supply delay time control module includes MOSFET, the 4th resistance R4 and the 4th capacitance
C4；Wherein：
The grid of the MOSFET connects the timer output end, and source electrode connects input voltage anode, and drain electrode connects load；It is described
4th capacitance C4 mono- terminates input voltage cathode, the discharge end and high-triggering end and the described 4th of another termination timer
The one end resistance R4；Another termination input voltage anodes of 4th resistance R4；
When low level on low triggering end, timer is triggered, output end is set height by the timer, and discharge end internal switch closes
It closes, input voltage is charged by the 4th resistance R4 for the 4th capacitance C4, and MOSFET is closed；As the 4th capacitance C4
When voltage reaches 2/3rds input voltages, the timer sets low output end, and the conducting of discharge end internal switch is released described
Charge on 4th capacitance, MOSFET is open-minded, and external dc power is connected with communication equipment.
In the above scheme, it is also provided with surge current limitation module, the opening speed of MOSFET is controlled, inhibits due to rear
Dash current caused by the capacitive load of end.
In the above scheme, the surge current limitation module includes the 5th resistance R5, the 6th resistance R6 and the 6th capacitance
C6；
The 6th resistance R6 is in parallel with the 6th capacitance C6, a termination input voltage anode, another termination MOSFET
Grid and the one end the 5th resistance R5；
The 5th resistance R5 other ends are connect with the timer output end.
The present invention realizes plant-grid connection delay by timer, and wink is connected with equipment supply hub in power adapter plug
Between, so that rear end capacitive load is not yet accessed circuit, avoid forming electric spark between plug and jack, it is ensured that plug and jack have enough
Time complete connection, after plug and jack is reliably connected, a drive signal is provided by timer, opens rear end
MOSFET realizes the connection for leading to power supply and communication equipment；In addition, the present invention is also provided with RC between driving source and MOSFET grids
Network, to control the opening speed of MOSFET, to realize that the limitation to dash current caused by capacitive load, this delay connect
The collective effect of circuit passband and inrush current limiting circuit realizes the reliable access of low-voltage dc power supply, improves plant-grid connection
Reliability.
Description of the drawings
Fig. 1 is a kind of structure diagram of the reliable access device of low-voltage dc power supply provided by the invention；
Fig. 2 is a kind of physical circuit figure of the reliable access device of low-voltage dc power supply provided by the invention.
Specific implementation mode
The present invention installs on a communications device, by realizing that the delay of power supply is connected, avoids the mistake that plug is connected with jack
Transient has been reliably connected in adaper plug and communication equipment jack, and when the wild effects such as ring have been eliminated, and can just be connect
Logical circuit between adapter and communication equipment mainboard power supply avoids the occurrence of spark phenomenon, causes communication equipment abnormal or damage；Together
When the present invention additionally use efficient, controllable soft starting circuit and inhibit power-on impact current, the circuit-line impedance is very small, line
Road pressure drop can be neglected substantially；There is no the devices that power consumption is larger, substantially without high temperature safe hidden danger；Consuming power consumption almost can be with
It ignores, is conducive to the requirement for meeting energy-saving and emission-reduction.
The present invention is described in detail with specific embodiment with reference to the accompanying drawings of the specification.
As shown in Figure 1, the present invention provides a kind of reliable access device of low-voltage dc power supply, including (555 is fixed for timer 10
When device), trigger signal module 20 and power supply delay time control module 30；
When adaper plug is inserted into communication equipment jack moment, DC voltage passes through trigger signal module 20, trigger signal
Module 20 exports the low level of certain time, and triggering timer 10 enters steady-working state, and output height is set；Power supply
Delay time control module 30 becomes low and sets by setting 10 output end of timer from height, and control external dc power is set with communication
For by blocking to connecting, to achieve the effect that external dc power delay is communication equipment power supply.
As shown in Fig. 2, in the present invention, trigger signal module 20 includes by first resistor R1, second resistance R2 and first
RC circuits, NPN type triode T1 and the 3rd resistor R3 that capacitance C1 is constituted, wherein：
First capacitance C1 mono- terminates input voltage anode, the one end another termination first resistor R1；The first resistor R1 other ends
Connect the one end second resistance R2 and NPN type triode T1 base stages b；The second resistance R2 other ends and NPN type triode T1 emitter es connect
Input voltage cathode, NPN type triode T1 collectors c are connect with timer low triggering end and the one end 3rd resistor R3 respectively, the
Another termination input voltage anodes of three resistance R3.
When adaper plug is inserted into communication equipment jack moment, external dc power voltage is first by first resistor R1
Capacitance C1 chargings, when the resistance and capacitance of selection are appropriate, the charging current of the first capacitance C1 will flow through second resistance R2, be
NPN type triode T1 provides base stage and emitter voltage Vbe, to obtain the base current Ib and current collection of NPN type triode T1
Electrode current Ic suitably chooses third since the collector of NPN type triode T1 is connected to input voltage anode by 3rd resistor R3
Resistance R3 resistance values so that NPN type triode T1 enters saturation region, then collector will be in low level (about with emitter voltage Vce
0.3V), i.e., collector voltage is low level, and 10 low triggering end TRIGGER of timer is connect with collector, then low triggering end
TRIGGER is set to low level, and the low triggering end TRIGGER trigger voltage representative values of timer 10 (555) are 1.67V (5V
When output) and 5V while inputting (15V) so the trigger signal module 20 can ensure that timer 10 can be triggered reliably, if first
The value of capacitance C1, first resistor R1 and second resistance R2 are chosen appropriate, it can be ensured that the low level of low triggering end input is maintained at
In 100ms, ensure that timer 10 enters steady-working state；When the first capacitance C1 is charged to a certain degree, charging current reduces,
Voltage on second resistance R2 reduces, and the base stage of NPN type triode T1 is caused to be cut less than threshold level with transmitter voltage Vbe
Only, collector voltage will be equal with input voltage at this time, be high level, i.e. the low triggering end TRIGGER of timer 10 is set to
High level, the low level for thereby realizing timer low triggering end TRIGGER is kept, and is finally set to high process, is completed
The enabled process of timer 10；After the first capacitance C1 charging completes, for direct current power source voltage, the first capacitance C1 is suitable
In open circuit, and it is constantly in open circuit, there is no electric currents to flow through by second resistance R2, and the voltage Vbe of NPN type triode T1 is zero, NPN
Type triode T1 is closed, unless powering on again；This ensures that enabled of timer 10 (555) can trigger once, it is ensured that direct current
After power supply input circuit is connected, will not voluntarily it close.
In the present invention, power supply delay time control module 30 includes that (metal oxide semiconductor field-effect is brilliant by MOSFET
Body pipe) T2, the 4th resistance R4 and the 4th capacitance C4；Wherein：
The grid of MOSFET T2 meets timer output end OUTPUT, and source electrode connects input voltage anode, and drain electrode connects load circuit
(communication equipment)；4th capacitance C4 mono- terminates input voltage cathode, and the discharge end DISCHARGE and height of another termination timer are touched
Originator THRESHOLD and the 4th one end resistance R4；Another termination input voltage anodes of 4th resistance R4.
When low level (trigger signal) on low triggering end TRIGGER, timer is triggered, timer sets OUTPUT voltages
Height, equal with input voltage (direct current power source voltage), discharge end DISCHARGE internal switches are closed, and input voltage is begun through
4th resistance R4 is the 4th capacitance C4 chargings, and the grid of MOSFET T2 is that zero, MOSFET T2 are closed with source voltage at this time；When
When 4th capacitance C4 voltages (i.e. high-triggering end THRESHOLD voltages) reach 2/3rds input voltages, timer is by output end
OUTPUT is set low, the conducting of discharge end DISCHARGE internal switches, the charge released on the 4th capacitance C4, at this time MOSFET T2
Grid is high level with source voltage, and MOSFET T2 will be opened, and realizes that external dc power is the power supply of equipment.
555 runs are arranged plant-grid connection delay time, are exactly output end OUTPUT quilts in single monostable pattern
It is set to the time of high level, that is, the time that MOSFET T2 are closed, the time can mask plug and jack
The unstable state of connection procedure, for the key parameter of the present invention, which can be by adjusting the electricity of the 4th resistance R4 and the 4th
Hold C4 values to be adjusted, usually at 2 seconds or so.
In addition, the timer reset RESET functions of the present invention do not use, high level (input voltage anode) is connect；Control
Voltage end CONTROL_VOLTAGE functions do not use, by a third filter capacitor C3 to input voltage cathode, to prevent dry
It disturbs；VCC connects input voltage anode, and GND connects input voltage cathode.
In the present invention, when the output end OUTPUT of timer is set to high, the gate source voltage Vgs of MOSFET T2 is low electricity
Flat, MOSFET T2 will be closed；When the output end OUTPUT of timer is set low, the gate source voltage of MOSFET T2
Vgs is high level, and T2 will be opened, to connect the power channel between external dc power and communication equipment mainboard；Together
When MOSFET T2 opening speeds are too fast, prodigious dash current will be formed, surge current occurs, reduces plant-grid connection device
Reliability slows down the opening speed of MOSFET T2 in order to solve this problem, and the present invention is also provided with surge current limitation module,
Surge current limitation module specifically includes the 5th resistance R5, the 6th resistance R6 and the 6th capacitance C6, the electricity of the 6th resistance R6 and the 6th
It is in parallel to hold C6, latter termination input voltage in parallel is positive, the grid of another termination MOSFET T2 and the 5th one end resistance R5；The
The five resistance R5 other ends are connect with timer output end OUTPUT, and bleeder circuit is constituted with the 6th resistance R6, can be according to selected
MOSFET T2 models, be arranged gate source voltage；And the 5th resistance R5 and the 6th capacitance C6 constitute RC circuits, by adjusting the
The value of five resistance R5 and the 6th capacitance C6, the opening speed of control MOSFET T2, inhibits caused by the capacitive load of rear end
The time constant for the RC circuits that dash current, the 5th resistance R5 and the 6th capacitance C6 are constituted is bigger, the opening speed of MOSFET T2
It is slower, in practical applications, the size of capacitive load, the safe work of the over-current protection point of front end power supply, MOSFET T2 should be integrated
Make the factors such as area, selects the 5th resistance R5 appropriate and the 6th capacitance C6 values, it is ensured that the reliability of circuit.
Obviously, various changes and modifications can be made to the invention without departing from essence of the invention by those skilled in the art
God and range.In this way, if these modifications and changes of the present invention belongs to the range of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to include these modifications and variations.
Claims (4)
1. a kind of reliable access device of low-voltage dc power supply, which is characterized in that prolong including timer, trigger signal module and power supply
When time control module；
When adaper plug is inserted into communication equipment jack moment, DC voltage passes through the trigger signal module, the triggering letter
The low level of number module output certain time, triggers the timer and enters steady-working state, the timer will be defeated
Outlet height is set；The power supply delay time control module becomes low and sets by setting the timer output end from height, and control is outer
Portion's DC power supply is with communication equipment by blocking to connection；
The trigger signal module includes first resistor R1, second resistance R2, the first capacitance C1, NPN type triode T1 and third
Resistance R3, wherein：
The first capacitance C1 mono- terminates input voltage anode, another termination one end the first resistor R1；The first resistor
Another termination one end the second resistance R2 R1 and the NPN type triode T1 base stages；The second resistance R2 other ends and institute
It states NPN type triode T1 emitters and connects input voltage cathode；NPN type triode T1 collectors are low with the timer respectively to be touched
Originator is connected with the one end the 3rd resistor R3；Another termination input voltage anodes of 3rd resistor R3.
2. the reliable access device of low-voltage dc power supply as described in claim 1, which is characterized in that the power supply delay time control
Molding block includes MOSFET, the 4th resistance R4 and the 4th capacitance C4；Wherein：
The grid of the MOSFET connects the timer output end, and source electrode connects input voltage anode, and drain electrode connects load；Described 4th
Capacitance C4 mono- terminates input voltage cathode, the discharge end and high-triggering end of another termination timer and the 4th resistance
The one end R4；Another termination input voltage anodes of 4th resistance R4.
3. the reliable access device of low-voltage dc power supply as claimed in claim 2, which is characterized in that be also provided with surge current limit
Molding block controls the opening speed of MOSFET, inhibits the dash current caused by the capacitive load of rear end.
4. the reliable access device of low-voltage dc power supply as claimed in claim 3, which is characterized in that the surge current limits mould
Block includes the 5th resistance R5, the 6th resistance R6 and the 6th capacitance C6；
The 6th resistance R6 is in parallel with the 6th capacitance C6, a termination input voltage anode, the grid of another termination MOSFET
Pole and the one end the 5th resistance R5；
The 5th resistance R5 other ends are connect with the timer output end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610784294.0A CN106208655B (en) | 2016-08-31 | 2016-08-31 | A kind of reliable access device of low-voltage dc power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610784294.0A CN106208655B (en) | 2016-08-31 | 2016-08-31 | A kind of reliable access device of low-voltage dc power supply |
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| Publication Number | Publication Date |
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| CN106208655A CN106208655A (en) | 2016-12-07 |
| CN106208655B true CN106208655B (en) | 2018-10-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201610784294.0A Active CN106208655B (en) | 2016-08-31 | 2016-08-31 | A kind of reliable access device of low-voltage dc power supply |
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| CN (1) | CN106208655B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107846286A (en) * | 2017-10-19 | 2018-03-27 | 浙江大华技术股份有限公司 | It is a kind of for the electric supply installation of cascade, method of supplying power to and cascade electric power system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0680808A1 (en) * | 1994-04-25 | 1995-11-08 | Black & Decker Inc. | Impact tool having speed control circuit |
| CN102420596A (en) * | 2011-12-12 | 2012-04-18 | 汉柏科技有限公司 | Delay device compatible with various level analog signals |
| CN202918261U (en) * | 2012-10-17 | 2013-05-01 | 上海西门子医疗器械有限公司 | Time delay device making use of 555 timer and medical equipment |
-
2016
- 2016-08-31 CN CN201610784294.0A patent/CN106208655B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0680808A1 (en) * | 1994-04-25 | 1995-11-08 | Black & Decker Inc. | Impact tool having speed control circuit |
| CN102420596A (en) * | 2011-12-12 | 2012-04-18 | 汉柏科技有限公司 | Delay device compatible with various level analog signals |
| CN202918261U (en) * | 2012-10-17 | 2013-05-01 | 上海西门子医疗器械有限公司 | Time delay device making use of 555 timer and medical equipment |
Non-Patent Citations (1)
| Title |
|---|
| IGBT高压大功率驱动和保护电路的应用研究;潘江洪;《电源技术应用》;20051130;第54页，图4 * |
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Denomination of invention: A reliable access device for low voltage DC power supply Effective date of registration: 20210531 Granted publication date: 20181009 Pledgee: Guanggu Branch of Wuhan Rural Commercial Bank Co.,Ltd. Pledgor: Wuhan Changjiang Computing Technology Co.,Ltd. Registration number: Y2021420000031 |
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Date of cancellation: 20230914 Granted publication date: 20181009 Pledgee: Guanggu Branch of Wuhan Rural Commercial Bank Co.,Ltd. Pledgor: Wuhan Changjiang Computing Technology Co.,Ltd. Registration number: Y2021420000031 |