CN104158283B - Circuit and method for realizing smooth switching of main stand-by power source of communication equipment - Google Patents
Circuit and method for realizing smooth switching of main stand-by power source of communication equipment Download PDFInfo
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- CN104158283B CN104158283B CN201410377055.4A CN201410377055A CN104158283B CN 104158283 B CN104158283 B CN 104158283B CN 201410377055 A CN201410377055 A CN 201410377055A CN 104158283 B CN104158283 B CN 104158283B
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Abstract
The invention provides a circuit and method for realizing the smooth switching of a main stand-by power source of communication equipment. The circuit comprises an AC (alternate current)-DC (direct current) module and a switching control circuit, wherein the input end of the AC-DC module is connected to the AC input of a main power supply, and the output end of the AC-DC module is connected to a relay normally-opened contact; the DC input of a back-up power supply is connected to the relay normally-closed contact; a relay contact is connected with a processor main board through a switch and a protective circuit; the input end of the switching control circuit is connected with the output end of the AC-DC module; the output end of the switching control circuit is connected with the control end of an electronic switch; one end of the electronic switch is grounded, and the other end of the electronic switch is connected with one end of a relay coil; the other end of the relay coil is connected to the output end of the AC-DC module. According to the invention, the switching control circuit is additionally arranged, so that the relay cuts off the loop current of the relay coil in advance in the phase that the voltage starts to descent, and the relay contact can be quickly released, therefore, the purpose for realizing quick and smooth switching is achieved.
Description
Technical field
The present invention relates to wireless communication technology field, more particularly to a kind of realize what communication equipment main power supply took over seamlessly
Circuit and method.
Background technology
In professional wireless communication network application, expanded the coverage area using intermediate station or base station communication apparatus in a large number.Special
In the application of industry, it is typically necessary and provides back-up source to these professional equipments, ensures that the normal operation of communication system is provided
Continual communication service.Main power source generally adopts alternating current power supply, and back-up source is generally using DC UPS or electric power storage
Pond.Back-up source is used based on ac main power, when main power source power down generally as interim Emergency use, under normal circumstances equipment
When, temporarily it is switched to back-up source；After main power source recovers, back-up source is disconnected in time, switchback main power source continues to equipment
Power supply.During this main power supply is toggled, it is desirable to keep voltage steady, nothing is fallen, it is impossible to cause communication equipment
Reset restarting, reduces calling traffic and interrupts.
Because the operating current of intermediate station or base station communication apparatus is than larger, may pacify to tens from several peaces, at present mostly
Switched using relay, when being switched to main power source from back-up source, voltage is stable, will not be fallen.But from master
When power supply is switched to back-up source, cause power supply to fall moment, cause equipment to restart, cause well afoot to be exhaled
Cry interruption.
Voltage Drop in switching is because the hangover of relay contact causes, that is to say, that dropped under voltage
Cheng Zhong, processor power-off reset in communication mainboard, and now relay does not also discharge completely, switching has not been completed,
Communication equipment is caused to restart；The time restarted is general longer, may be in the long-time of even one or two minute tens seconds
Calling service cannot be provided, in the case of running into urgent event serious adverse consequencess can be caused.
The content of the invention
It is an object of the invention to provide it is a kind of realize between communication equipment main power source and back-up source seamless mutually cut
The circuit for changing and method, it is ensured that communication equipment will not power-off reset restarting in power supply handoff procedure.
The purpose of the present invention is achieved through the following technical solutions.
It is a kind of to realize the circuit that communication equipment main power supply takes over seamlessly, including：One AC/DC power module, its is defeated
Enter to terminate main power source exchange input, its output relay termination normally opened contact；
Back-up source direct current is input into contact relay normally-closed contact, and relay contact Jing switches and protection circuit meet processor master
Plate,
Also include a control switching circuit, its input termination AC/DC power module outfan, the switching control
Circuit output terminates electronic switch controling end；
One end ground connection of the electrical switch, another one end for terminating the relay coil, the relay coil
Another termination AC/DC power module outfan.
Preferably, the electrical switch adopts switch triode Q1, the base stage of the switch triode Q1 to connect switching control
Circuit output end, the grounded emitter of the switch triode Q1, one end of its collector connecting relay J1 coils.
Preferably, the control switching circuit includes a resistance R1, a Zener diode D1, and the DC power supplier is defeated
Go out to hold Jing resistance R1 to be connected with the negative electrode of Zener diode D1, the anode of the Zener diode D1 connects the base of switch triode Q1
Pole.
Preferably, also including a sustained diode 3, its negative electrode connects DC power supplier outfan, the fly-wheel diode
The anode of D3 connects the colelctor electrode of switch triode Q1.
Preferably, also including an a commutation diode D2 and storage capacitor C1, the anode of the commutation diode D2 is succeeded
The COM contacts of electrical equipment J1, its negative electrode Jing storage capacitors C1 ground connection.
Preferably, the Zener diode D1 is Zener diode, and its load voltage value turns less than a certain proportion of exchange
DC power supplier output end voltage value.
Preferably, the commutation diode D2 is Schottky diode, for isolation capacitance C1 to input back discharge.
Preferably, the storage capacitor C1 is used for the discharge and recharge of motherboard power supply input circuit, increases discharge time constant, prolongs
Long discharge electricity fall time, make the voltage in handoff procedure steady.
Preferably, the sustained diode 3 is switching diode, for current switching moment on release relay coil
The backward voltage of generation, to protect driving switch audion Q1.
A kind of communication equipment main power supply smooth-switching method implemented as described above, when the output of AC/DC power module
When terminal voltage is in the range of +/- the 10% of rated value, Zener diode D1 is in breakdown conditions, makes out after resistance R1 current limlitings
Audion Q1 saturation conductions are closed, relay coil work is driven, completes to be switched to main power source from back-up source；
When AC/DC power module output end voltage is less than the +/- 0.5V of Zener diode breakdown voltage rating value
When, Zener diode D1 cut-offs, switch triode Q1 cut-offs, relay release completes to be switched to back-up source from main power source.
Compared with prior art, beneficial effect is the present invention：What the present invention was provided realizes that communication equipment main power supply is put down
The circuit and method that sliding cutting is changed passes through to increase by a control switching circuit so that relay begins to decline stage early cut-off in voltage
Relay coil loop current, reaches quick release relay contact, so as to realize the purpose of fast and smooth handoff.The circuit knot
Structure is simple, low cost, reliability are high, easily enforcement.It is relatively reliable for the operation of intermediate station communication equipment stable.
Description of the drawings
Fig. 1 is AC/DC power module output voltage characteristic curve chart；
Fig. 2 is that the present invention realizes the schematic block circuit diagram that communication equipment main power supply takes over seamlessly；
Fig. 3 is control switching circuit schematic diagram of the present invention；
Fig. 4 is the VI performance diagrams of Zener diode.
Specific embodiment
In order that the objects, technical solutions and advantages of the present invention become more apparent, it is right below in conjunction with drawings and Examples
The present invention is further elaborated.It should be appreciated that specific embodiment described herein is only to explain the present invention, and
It is not used in the restriction present invention.
In the present invention, communication equipment includes but is not limited to common intermediate station or base station, the main power source of communication equipment and standby
With to keep voltage steady in the mutual handoff procedure of power supply, to ensure the circuit of internal board unit and the power supply of processor chips
It is stable, it is ensured that the stable operation of system hardware and software.
Keep and the slow characteristic landed because the output voltage of " AC/DC power module " has, because general power supply
The output of module can all have thousand of microfarads to be used to filter the AC ripple of low frequency to the large bulk capacitance of tens microfarads.With 12V
As a example by output 300W or so the power transfer module of capacity, after exchange input disconnects, the rated direct voltage 12V that it is exported is general
Can be being kept for or so 2-3 seconds, then exponentially characteristic gradually declines to 0 to voltage, centre can through one section of about 500ms when
Between, from the moment that 12V voltages begin to decline, the time ts to motherboard circuit resetting voltage Vreset is about 50ms, such as
Shown in Fig. 1.
Communication equipment mainboard minimal maintenance voltage Vreset is about 6V, and relay coil adhesive maintenance voltage is less than
6V.If without any measure, voltage begins to decline and arrive constantly between relay discharges be switched to during back-up source completely,
12V DC voltages can produce falling for about more than 200-500ms time spans, cause the reset of motherboard circuit, result in and set
Standby restarting.
Core concept of the present invention：Such as Fig. 1, if the magnitude of voltage Vrelease that release movement completes the moment meets condition
Vrelease ＞ Vreset, as long as meeting the time conditions of (t0+tr) ＜ ts, you can completed switching before circuit reset.
Mean that from the moment that voltage begins to decline, to the time t0 at trigger voltage Vz moment, during along with completing release movement
Between tr, the whole process time, (t0+tr) will be completed within 50ms, it is possible to be achieved the goal.
Vz is set as 10V+/- 0.5V, it is about 10-20ms to survey the time t0 begun to decline to Vz from 12V, according to after
Electrical parameter tr is less than 10ms, so the scope of estimation (t0+tr) can meet the condition less than 50ms in 20-30ms.
Therefore, the present invention allows relay to begin to decline stage early cut-off in voltage by increasing by a control switching circuit
Relay coil loop current, reaches quick release relay contact, so as to realize the purpose of fast and smooth handoff.
Specifically, please participate in shown in Fig. 2, the present invention realizes that the circuit that communication equipment main power supply takes over seamlessly includes：
One AC/DC power module, its input termination main power source exchange input, its outfan DCIN contact relays are normal
Open contact NO；
Back-up source direct current is input into BAKIN contact relay normally-closed contact NC, relay COM contact Jing switches and protection circuit
Connect processor main board；
Further, also including a control switching circuit, its input termination AC/DC power module outfan DCIN cuts
Change control circuit output termination electrical switch SW control ends；
One end ground connection of electrical switch, one end of another relay termination coil, another termination exchange of relay coil
DC power module outfan DCIN.
In Fig. 2, the power supply of communication equipment includes two groups of inputs：" main power source exchange input " and " back-up source direct current is defeated
Enter ".
Usually, main power source uses alternating current power supply.
Below the handoff procedure of main power supply is divided into into two parts to describe respectively.
(1) back-up source switches to main power source
Under normal circumstances, " input of back-up source direct current " of equipment with " main power source exchanges input " while exist, it is now " main
Capable AC is input into " effectively, " AC/DC power module " output " main power source " voltage in " main power source exchange input " loop
DCIN, by " control switching circuit " electrical switch SW is driven, and turns on relay coil loop, and relay adhesive is normally closed to touch
Point NC and COM contacts disconnect, and BAKIN loops disconnect；" main power source " voltage DCIN is connected by normally opened contact NO with COM contacts,
Voltage DCOUT gives " switch and protection circuit " module of rear class, then the circuit given in " processor main board " is powered.
(2) main power source is switched to back-up source
If " main power source exchange input " power down suddenly, relay release, " back-up source direct current is defeated in communication equipment operation
Entering " BAKIN connected by relay normally-closed contact NC with COM contacts, and voltage DCOUT gives " switch and the protection circuit " of rear class
Module, then the circuit given in " processor main board " powers.
During communication equipment uses " back-up source " to power, if " main power source exchange input " recovers, by " cutting
Change control circuit " relay adhesive is made, " input of back-up source direct current " loop disconnects, and normally opened contact NO is connected with COM contacts,
" processor main board " is recovered to be powered by main power source.
And for handoff procedure (two) in, when back-up source is switched to from main power source, cause power supply can moment fall
Fall, cause equipment to restart, the present invention allows relay to begin to decline the stage in voltage and carry by increasing by a control switching circuit
Front block system relay wire loop electric current, reaches quick release relay contact, so as to realize the purpose of fast and smooth handoff.
Specifically, refer to shown in Fig. 3, in the present invention, control switching circuit includes a resistance R1, a Zener diode
D1, switch triode Q1,
DC power supplier outfan DCIN Jing resistance R1 are connected with the negative electrode of Zener diode D1, Zener diode D1's
Anode connects the base stage of switch triode Q1, the grounded emitter of switch triode Q1, and the one of its collector connecting relay J1 coils
End.
Further, also including a sustained diode 3, its negative electrode connects DC power supplier outfan DCIN, fly-wheel diode
The anode of D3 connects the colelctor electrode of switch triode Q1.
Further, also including a commutation diode D2 and the anode contact relay of a storage capacitor C1, commutation diode D2
The COM contacts of J1, its negative electrode Jing storage capacitors C1 ground connection,
Further, the negative electrode Jing switches and protection circuit of commutation diode D2 connects processor main board.
In Fig. 3, when DCIN voltages are rated value 12V+/- 10%, Zener diode D1 is in breakdown conditions, through R1
Audion Q1 saturation conductions are made after current limliting, relay coil work is driven, above-mentioned handoff procedure () is completed.
When DCIN terminal voltages are less than 10V+/- 0.5V, Zener diode D1 cut-offs, Q1 cut-offs, relay release is completed
Above-mentioned handoff procedure (two).
Specifically, Zener diode D1 selects general Zener diode (Zener diode).Its load voltage value ratio
The lower slightly certain suitable ratio of DCIN terminal voltage values.DCIN of the present invention selects to be calculated in 12V x80% ratios by taking 12V as an example,
Choose stabilivolt of the rated voltage for 10V+/- 0.5V.
VI characteristic curves such as Fig. 4 of Zener diode, VF, IF are the positive junction voltages and forward conduction electric current of diode,
VZ、IZTIt is the backward voltage and reverse breakdown current of diode.Present invention utilizes the reverse characteristic of Zener diode, works as applying
When the backward voltage increase at diode two ends is reached near breakdown voltage Vz, IZT starts to increase sharply, and diode quickly enters
Enter conducting state so that relay coil drives audion saturation conduction, relay quick pick-up to produce switching.
When the backward voltage for being applied to diode two ends is slowly decreased near breakdown voltage Vz, IZTStart rapid reduction,
The fast quick-recovery cut-off of diode so that relay coil drives audion cut-off, relay quick release to produce switching.
The Zener diode of 10V is selected, the node voltage Vz of trigger relay release can be set as 10V+/- 0.5V, can
Relay coil current loop, relay are disconnected by force in advance with the stage that the DC voltage on relay coil has just begun to decline
The release time of device mechanical contact about 10ms, it can be ensured that switching action is completed in 50ms, reach smooth and seamless switching
Purpose, makes equipment operate steadily reliability.
Preferably, electrical switch selects switch triode Q1, as the switch drive of relay coil, can select one
There is the audion of certain driving force.
Preferably, commutation diode D2 is Schottky diode (Shottky barrier diode), for isolation capacitance
C1 to input back discharge, with less forward drop.
Preferably, storage capacitor C1 is large bulk capacitance, for the discharge and recharge of motherboard power supply input circuit, when increasing electric discharge
Between constant, extend electric discharge electric fall time, make the voltage in handoff procedure more steady reliable.
Preferably, sustained diode 3 is regular tap diode, for current switching moment on release relay coil
The backward voltage of generation, for protection audion Q1 is driven.
Preferably, resistance R1 is the current-limiting resistance of Zener diode D1, chooses the saturation conduction of suitable state modulator Q1.
What the present invention was provided realizes that the circuit that communication equipment main power supply takes over seamlessly passes through to increase by a control switching circuit,
So that relay begins to decline stage early cut-off relay coil loop current in voltage, reach quick release relay and touch
Point, so as to realize the purpose of fast and smooth handoff.The circuit structure is simple, low cost, reliability are high, easily enforcement.For in
The operation of turntable communication equipment is relatively reliable stable.
Presently preferred embodiments of the present invention is the foregoing is only, not to limit the present invention, all essences in the present invention
Any modification, equivalent and improvement made within god and principle etc., should be included within the scope of the present invention.
Claims (8)
1. it is a kind of to realize the circuit that communication equipment main power supply takes over seamlessly, including：One AC/DC power module, its input
Termination main power source exchange input, its output relay termination normally opened contact；
Back-up source direct current is input into contact relay normally-closed contact, and relay contact Jing switches and protection circuit connect processor main board,
It is characterized in that；
Also include a control switching circuit, its input termination AC/DC power module outfan, the control switching circuit
Output termination electronic switch controling end；
One end ground connection of the electrical switch, one end of another termination relay coil, the relay coil it is another
Termination AC/DC power module outfan；
The control switching circuit includes a resistance R1, a Zener diode D1, the DC power supplier outfan Jing resistance
R1 is connected with the negative electrode of Zener diode D1, and the anode of the Zener diode D1 connects the base stage of switch triode Q1；
The Zener diode D1 is Zener diode, and its load voltage value is than AC/DC power module output end voltage value
Lower slightly certain ratio so that (t0+tr)<Ts, t0 therein drop to for AC/DC power module output end voltage value
It is institute that time, tr required for Zener diode D1 load voltage values completes release movement required time, ts for the relay
State AC/DC power module output end voltage value and drop to time needed for motherboard circuit resetting voltage.
2. the circuit that communication equipment main power supply takes over seamlessly is realized as claimed in claim 1, it is characterised in that the electronics
Switch adopts switch triode Q1, the base stage of the switch triode Q1 to connect control switching circuit outfan, the pole of the switch three
The grounded emitter of pipe Q1, one end of its collector connecting relay J1 coils.
3. the circuit that communication equipment main power supply takes over seamlessly is realized as claimed in claim 2, it is characterised in that also including one
Sustained diode 3, its negative electrode connects DC power supplier outfan, and the anode of the sustained diode 3 meets switch triode Q1
Colelctor electrode.
4. the circuit that communication equipment main power supply takes over seamlessly is realized as claimed in claim 2, it is characterised in that also including one
The COM contacts of the anode contact relay J1 of a commutation diode D2 and storage capacitor C1, the commutation diode D2, its negative electrode Jing
Storage capacitor C1 is grounded.
5. the circuit that communication equipment main power supply takes over seamlessly is realized as claimed in claim 4, it is characterised in that the rectification
Diode D2 is Schottky diode, for isolation capacitance C1 to input back discharge.
6. the circuit that communication equipment main power supply takes over seamlessly is realized as claimed in claim 4, it is characterised in that the energy storage
Electric capacity C1 is used for the discharge and recharge of motherboard power supply input circuit, increases discharge time constant, extends electric discharge electric fall time, makes switching
During voltage it is steady.
7. the circuit that communication equipment main power supply takes over seamlessly is realized as claimed in claim 3, it is characterised in that the afterflow
Diode D3 is switching diode, for the backward voltage that current switching moment on release relay coil produces, to protect drive
Dynamic switch triode Q1.
8. a kind of method that the circuit that communication equipment main power supply takes over seamlessly is realized as described in any one of claim 1-7, its
It is characterised by, when in the range of +/- 10% that AC/DC power module output end voltage is rated value, Zener diode D1
In breakdown conditions, make switch triode Q1 saturation conductions after resistance R1 current limlitings, drive relay coil work, complete from
Back-up source is switched to main power source；
As +/- 0.5V of the AC/DC power module output end voltage less than Zener diode breakdown voltage rating value, surely
Pressure diode D1 cut-offs, switch triode Q1 cut-offs, relay release completes to be switched to back-up source from main power source.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410377055.4A CN104158283B (en) | 2014-08-01 | 2014-08-01 | Circuit and method for realizing smooth switching of main stand-by power source of communication equipment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410377055.4A CN104158283B (en) | 2014-08-01 | 2014-08-01 | Circuit and method for realizing smooth switching of main stand-by power source of communication equipment |
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| CN104158283A CN104158283A (en) | 2014-11-19 |
| CN104158283B true CN104158283B (en) | 2017-05-17 |
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104485730B (en) * | 2014-11-28 | 2017-08-01 | 国家电网公司 | Take over seamlessly the circuit of power supply |
| US10937266B2 (en) * | 2014-12-03 | 2021-03-02 | Giesecke+Devrient Currency Technology Gmbh | Banknote processing machine having power control electronics |
| CN106787138B (en) * | 2016-12-26 | 2023-08-29 | 中石化江汉石油工程有限公司 | Multifunctional power supply control system of underground logging instrument |
| CN107947334A (en) * | 2017-11-21 | 2018-04-20 | 广州圣力电源实业有限公司 | A kind of two-supply circuit system |
| CN107885108B (en) * | 2017-12-18 | 2024-03-19 | 深圳科立讯通信有限公司 | Control device for electronic equipment |
| CN108418300B (en) * | 2018-05-09 | 2023-08-08 | 广州大学 | Main and standby battery power supply automatic switching output circuit |
| CN109510289A (en) * | 2018-12-18 | 2019-03-22 | 镇江中煤电子有限公司 | Mining wireless base station backup power supply control device and control method |
| CN110996027B (en) * | 2019-12-27 | 2022-07-05 | 深圳康佳电子科技有限公司 | Standby circuit, method and television |
| CN112769220B (en) * | 2020-12-28 | 2023-03-28 | 广东电网有限责任公司清远供电局 | Universal standby power supply and power supply system for power grid automation terminal |
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| CN204131213U (en) * | 2014-08-01 | 2015-01-28 | 科立讯通信股份有限公司 | A kind of circuit realizing communication equipment main power supply and take over seamlessly |
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| JP6112287B2 (en) * | 2012-07-09 | 2017-04-12 | セイコーエプソン株式会社 | Power supply switching circuit, real-time clock device, electronic device, moving object, and control method for power supply switching circuit |
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Effective date of registration: 20180211 Address after: 518000 Guangdong city of Shenzhen province Nanshan District Xili Street Lang Road No. 11, Tongfang information port A on the third floor Patentee after: Shenzhen kelixun Communication Co., Ltd. Address before: 518000 Guangdong city of Shenzhen province Nanshan District Science Park Song Ping Shan Qi Min Road No. three Betel building six floor Patentee before: Kirisun Communication Co., Ltd. |
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Effective date of registration: 20200509 Address after: 362000 Fujian province Quanzhou Fengze District Science and Technology Industrial Park Road, Haixi electronic information industry incubation base building C Patentee after: FUJIAN KIRISUN COMMUNICATIONS Co.,Ltd. Address before: 518000 Guangdong city of Shenzhen province Nanshan District Xili Street Lang Road No. 11, Tongfang information port A on the third floor Patentee before: SHENZHEN KIRISUN COMMUNICATIONS Co.,Ltd. |