CN103701088B - A kind of base station powers and can turn off the current protecting circuit of high-precision quick response - Google Patents
A kind of base station powers and can turn off the current protecting circuit of high-precision quick response Download PDFInfo
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- CN103701088B CN103701088B CN201310749847.5A CN201310749847A CN103701088B CN 103701088 B CN103701088 B CN 103701088B CN 201310749847 A CN201310749847 A CN 201310749847A CN 103701088 B CN103701088 B CN 103701088B
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Abstract
The present invention is that communications field base station towers puts a kind of protection circuit, is specifically related to a kind of base station and powers and can turn off the current protecting circuit of high-precision quick response.It includes power supply, input buffer circuit, inspection leakage resistance, switching tube circuit, power output circuit, the signal detection that can arrange current threshold process circuit, can ensure current threshold do not change with input voltage and change constant-current source bias circuit, external control signal and signal detection can be introduced process circuit and control the control signal of switching tube connecting and disconnecting of the circuit and process circuit.This protection circuit has the advantage that protective current precision is high, response speed is fast, load supplying can turn off, and can better meet protection and the maintenance of tower amplifier and antenna.
Description
Technical field
The present invention is the one protection circuit that communications field base station towers is put, and is specifically related to a kind of base station and powers and can turn off the current protecting circuit of high-precision quick response.
Background technology
Traditional communication base station is as shown in Figure 1, being connected to a tower amplifier after reception antenna, tower amplifier, receiving receiving signal amplification before signal carries out feeder line, improves uplink signal quality, improve call reliability and speech quality, expand MPS process area simultaneously.
Antenna and tower amplifier position, in outdoor, have with a certain distance from base station, base station be powered (general power supply ranges for 10V～30V) by cable pair tower amplifier and antenna.Because antenna and tower amplifier are exposed to outdoor, it is easy to be subject to the impact of nature extreme environment and cause that tower amplifier and antenna damage and lost efficacy, as thundered, storm wind sleet, frosty weather.Circuit protection when one of them technical barrier is exactly realize tower amplifier, antenna failure and maintenance.When tower amplifier, antenna normal operation, operating current is certain, judges tower amplifier, antenna whether operation irregularity by detecting base station supply tower amplifier, Antenna Operation electric current sum；Additionally staff sometimes needs climb up steel tower routine inspection or change the equipment damaged, and at this moment needs to disconnect the base station power supply to this path.Therefore base station need to possess power supply to the protection circuit that tower amplifier and antenna are powered and can turn off, detect the features such as current precision height, fast reaction.
There is following problems in current protecting circuit common at present:
1, the protection circuit response time is long: an inspection leakage resistance of connecting in service cable line front end, base station, operational amplifier amplifies the pressure reduction at inspection leakage resistance two ends and reports single-chip microcomputer, after single-chip microcomputer detects that electric current crosses thresholding, performs protection act.From detecting that electric current crosses thresholding, then it is long to make the order interlude of shutoff to single-chip microcomputer, and the device in circuit exists the probability damaged.
2, electric current does not have threshold value: an electric fuse of connecting in service cable line front end, base station, is played the effect of protection by the fusing of electric fuse.As the amplifier tube in tower amplifier damages, the feature of performance is not short circuit but electric current increases, and the electric current of this increase is unlikely to the fusing of electric fuse, and electric fuse does not have the effect of protection in this case.
Summary of the invention
The purpose of the present invention is contemplated to solve the deficiency that above-mentioned background technology exists, it is provided that a kind of base station powers and can turn off the current protecting circuit of high-precision quick response.
The technical solution used in the present invention is: a kind of base station powers and can turn off the current protecting circuit of high-precision quick response, the constant-current source bias circuit that process circuit including power supply, input buffer circuit, inspection leakage resistance, switching tube circuit, power output circuit, the signal detection that can arrange current threshold, can ensure current threshold and do not change with input voltage and change, can introduce external control signal and signal detection and processes circuit and control the control signal of switching tube break-make and process circuit；Described input buffer circuit input connects power supply, outfan connects inspection leakage resistance, examines leakage resistance other end connecting valve pipe circuit input end, and described switching tube circuit output end connects power output circuit input, and power output circuit outfan connects load；Described signal detection processes circuit and includes operational amplifier U10, and the normal phase input end of described operational amplifier U10 and inverting input connect inspection leakage resistance two ends, described operational amplifier U10 outfan another input of connecting valve pipe respectively；Described constant-current source bias circuit output end connects the normal phase input end of described operational amplifier U10, and described control signal processes an outfan of circuit and connects the inverting input of described operational amplifier U10, another outfan concatenation operation amplifier U10 outfan.
Further, described signal detection processes circuit and also includes resistance R11, resistance R12, resistance R16, described resistance R11 is connected between operational amplifier U10 normal phase input end and inspection leakage resistance one end, described resistance R16 is connected between operational amplifier U10 normal phase input end and constant-current source bias circuit output end, and described resistance R12 is connected between operational amplifier U10 inverting input and the inspection leakage resistance other end.
Further, described constant-current source bias circuit includes+5V power supply, three end voltage-reference diode U11, audion Q13, resistance R18, resistance R20, resistance R24, No. 1 terminal connecting triode Q13 emitter stage of described three end voltage-reference diode U11, No. 2 terminal connecting triode Q13 base stages, No. 3 terminal ground；Described audion Q13 colelctor electrode connects resistance R18 and resistance R16, and the resistance R18 other end is connected between input buffer circuit and inspection leakage resistance；Described resistance R20 one end connects+5V power supply, other end connecting triode Q13 base stage；Described resistance R24 one end connecting triode Q13 emitter stage, other end ground connection.
Further, described control signal processes circuit and includes audion Q12, audion Q14, audion Q15, audion Q16, resistance R14 and resistance R15, described audion Q15 base stage connects external control signal through resistance R15, grounded emitter, colelctor electrode is through resistance R14 connecting triode Q12 base stage, described audion Q12 grounded emitter, colelctor electrode connecting triode Q14 base stage, described audion Q14 grounded emitter, colelctor electrode concatenation operation amplifier U10 inverting input, described audion Q16 base stage connecting triode Q12 base stage, grounded emitter, colelctor electrode concatenation operation amplifier U10 inverting input.
Further, described control signal processes circuit and also includes electric capacity C12, electric capacity C13, described electric capacity C12 two ends are concatenation operation amplifier U10 inverting input and operational amplifier U10 outfan, described electric capacity C13 one end connecting triode Q12 colelctor electrode, other end ground connection respectively.
Further, described control signal processes circuit and also includes+5V power supply, resistance R13, resistance R17, resistance R19, described resistance R17 one end concatenation operation amplifier U10 outfan, other end connecting triode Q12 colelctor electrode, described resistance R19 one end is connected between input buffer circuit and inspection leakage resistance, other end connecting triode Q15 colelctor electrode, and described resistance R13 one end connects+5V power supply, the other end connects resistance R15.
Further, described input buffer circuit includes the inductance L10 that one end connects power supply, the other end connects inspection leakage resistance and three ground capacities being connected between inductance L10 and inspection leakage resistance.
Further, described switching tube circuit includes MOSFET pipe, is connected in parallel on electric capacity and the transient voltage suppressor diode at the two poles of the earth, MOSFET pipe grid source, and the outfan of grid concatenation operation amplifier U10 of described MOSFET pipe, source electrode connect inspection leakage resistance, drain electrode connects power output circuit.
Further, described power output circuit includes one end connection MOSFET pipe drain electrode, the other end connects the inductance L11 of load and connects the ground capacity C11 of MOSFET pipe drain electrode.
The current protecting circuit of the present invention not only current precision is high, and response speed is fast, and current threshold does not change with the change of running voltage, when electric current exceedes the setting value of protection circuit, can power by automatic disconnecting consumers, protects device；Simultaneously when outside need controls the disconnection of load normal power supply, it is possible to carry out disconnecting consumers by control external input signal and power, it is achieved load supplying can turn off.This protection circuit has the advantage that protective current precision is high, protect fast response time, load supplying to turn off, and can better meet protection and the maintenance of tower amplifier and antenna.
Accompanying drawing explanation
Fig. 1 is the structure chart of base station tower amplifier and antenna.
Fig. 2 is the structural representation of the present invention.
Fig. 3 is the circuit theory diagrams of the embodiment of the present invention 1.
Fig. 4 is the decision flow chart of the embodiment of the present invention 1.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail, it is simple to be well understood to the present invention, but the present invention is not constituted restriction by them.
As in figure 2 it is shown, the present invention includes power supply 1, input buffer circuit 2, inspection leakage resistance 3, switching tube circuit 4, power output circuit 5, load 6, constant-current source bias circuit 7, signal detection processes circuit 8 and control signal processes circuit 9.Described input buffer circuit 2 input connects power supply 1, outfan connects inspection leakage resistance 3, inspection leakage resistance 3 other end connecting valve pipe circuit 4 input, described switching tube circuit 4 outfan connects power output circuit 5 input, and power output circuit 5 outfan connects load 6；Described signal detection processes circuit 8 and includes operational amplifier U10, and the normal phase input end of described operational amplifier U10 and inverting input connect inspection leakage resistance 3 two ends, described operational amplifier U10 outfan another input of connecting valve pipe circuit 4 respectively；Described constant-current source bias circuit 7 outfan connects the normal phase input end of described operational amplifier U10, and described control signal processes an outfan of circuit 9 and connects the inverting input of described operational amplifier U10, another outfan concatenation operation amplifier U10 outfan.
As shown in Figure 3, described input buffer circuit 2 plays the effect of filtering and energy storage, there is provided stable power supply for load, connect power supply including one end, the other end connects the inductance L10 examining leakage resistance and be connected to inductance and three the ground capacity C14 examined between leakage resistance, electric capacity C15, electric capacity C16.
Described inspection leakage resistance R10 processes the operational amplifier U10 input of circuit 8 for the voltage at its two ends is supplied to signal detection.
Described switching tube circuit 4 input connects the input of inspection leakage resistance R10, outfan connection power output circuit 5, including MOSFET pipe Q10, the ceramic condenser C10 and transient voltage suppressor diode Q11 that are connected in parallel on the two poles of the earth, MOSFET pipe Q10 grid source, the outfan of grid concatenation operation amplifier U10 of described MOSFET pipe, source electrode connect inspection leakage resistance R10, drain electrode connects power output circuit 5, MOSFET pipe Q10 and the MOSFET of enhancement mode P-channel should be selected to manage.Ceramic condenser C10 and transient voltage suppressor diode Q11 is used for protecting MOSFET to manage; ceramic condenser C10 wherein in parallel adds the grid input capacitance of MOSFET pipe Q10; delaying MOSFET pipe Q10 ON time, minimizing MOSFET pipe Q10 conducting moment sends a telegraph because of output capacitor C11 void short-range missile and flows through thresholding and make protection circuit erroneous action.
Described power output circuit 5 includes one end connection MOSFET pipe Q10 drain electrode, the other end connects the inductance L11 of load 6 and connects the ground capacity C11 of MOSFET pipe drain electrode.At a MOSFET pipe outfan electric capacity C11 over the ground in parallel, absorb the energy of surge, it is to avoid MOSFET pipe conducting moment, because switching tube self character produces surge on circuit, affect power good.
Described signal detection processes circuit 8 and includes resistance R11, resistance R12, resistance R16 and operational amplifier U10, the normal phase input end of operational amplifier U10 and reverse input end are connected to inspection leakage resistance R10 two ends respectively through resistance R11 and resistance R12, and resistance R16 is connected between operational amplifier U10 normal phase input end and constant-current source bias circuit 7 outfan.Signal detection processes circuit 8 and mainly arranges threshold and detect the voltage that inspection leakage resistance two ends provide, it is judged that and it is made whether the order of action.
Described constant-current source bias circuit includes three end voltage-reference diode U11, audion Q13, resistance R18, resistance R20, resistance R24, its each between annexation be: No. 1 terminal connecting triode Q13 emitter stage of described three end voltage-reference diode U11, No. 2 terminal connecting triode Q13 base stages, No. 3 terminal ground；Described audion Q13 colelctor electrode connects resistance R18 and resistance R16, and the resistance R18 other end is connected between input buffer circuit and inspection leakage resistance, namely connects the node Node1 position shown in Fig. 3；Described resistance R20 one end connects+5V power supply, other end connecting triode Q13 base stage；Described resistance R24 one end connecting triode Q13 emitter stage, other end ground connection.
Constant-current source bias circuit is in wide input voltage range, meet threshold to change with input voltage and change, its principle is: three end voltage-reference diode U11 provide reference voltage to resistance R24, flowing through the electric current of resistance R18 and flow through R24 electric current approximately equal, the pressure drop of resistance R18 is that R18 resistance is multiplied by three end voltage-reference diode U11 reference voltages divided by R24 resistance.The pressure reduction of node Node1 and node Node2 is the pressure drop on resistance R18, and the pressure drop on resistance R18 is steady state value, then under meeting wide input voltage situation, the pressure reduction of node Node1 and node Node2 is steady state value, and the operational amplifier U10 normal phase input end voltage namely realized in signal detection process circuit is the line relationship of 1 with the voltage Vin coefficient of ratio.
Described control signal processes circuit 9 and includes audion Q12, audion Q14, audion Q15, audion Q16, electric capacity C12, electric capacity C13, resistance R17, resistance R19, resistance R13, resistance R14, resistance R15, its each between annexation be: described audion Q15 base stage through resistance R15 connect external control signal, grounded emitter, colelctor electrode is through resistance R14 connecting triode Q12 base stage, described audion Q12 grounded emitter, colelctor electrode connecting triode Q14 base stage, described audion Q14 grounded emitter, colelctor electrode concatenation operation amplifier U10 inverting input, described audion Q16 base stage connecting triode Q12 base stage, grounded emitter, colelctor electrode concatenation operation amplifier U10 inverting input.Described electric capacity C12 two ends are concatenation operation amplifier U10 inverting input and operational amplifier U10 outfan, described electric capacity C13 one end connecting triode Q12 colelctor electrode, other end ground connection respectively.Described resistance R17 one end concatenation operation amplifier U10 outfan, other end connecting triode Q12 colelctor electrode, described resistance R19 one end is connected between input buffer circuit and inspection leakage resistance, namely connecting the node Node1 position shown in Fig. 3, resistance R19 other end connecting triode Q15 colelctor electrode, described resistance R13 one end connects+5V power supply, the other end connects resistance R15.
Control signal processes the principle of circuit introducing external control signal control switching tube break-make: control signal processes the control pin of circuit external control signal connecting valve or single-chip microcomputer, to one pull-up resistor R13 of external control signal, powered on moment external control signal obtains an original levels, and the colelctor electrode parallel connection of audion Q14 and audion Q16 is connected with the inverting input of operational amplifier U10.When audion Q14, audion Q16 end, two audion parallel connection colelctor electrode output impedances can be considered infinitely great, and when two audions wherein have a triode ON, two audion parallel connection colelctor electrode output impedances can be considered short circuit.When audion Q12 ends, resistance R17, the voltage before amplifier sudden change can be kept a period of time by the RC impulse electricity circuit of electric capacity C13 composition, it is prevented that switching tube energising immediate current is crossed thresholding and made protection circuit erroneous action.
Under load normal operation, external control signal SW_CTRL inputs a high level, powered on moment, audion Q15 turns on, audion Q15 colelctor electrode output low level, audion Q16, audion Q12 is cut-off state, the input of audion Q14 base stage is low level, and audion Q14 is in cut-off state.Therefore operational amplifier U10 end of oppisite phase input voltage is more than its positive terminal input voltage, and operational amplifier U10 is output as low level, and MOSFET pipe Q10 gate source voltage difference is more than its Vgs (th) voltage, and therefore MOSFET pipe is gradually turned on, powering load.
And when load current reaches to arrange threshold current, operational amplifier U10 normal phase input end voltage is more than end of oppisite phase input voltage, operational amplifier U10 exports high level.MOSFET pipe Q10 gate source voltage difference is less than its Vgs (th) voltage, and MOSFET pipe turns off, and load supplying disconnects.
When outside need controls the disconnection of load normal power supply, a low level is inputted to external control signal SW_CTRL, audion Q15 is in cut-off state, audion Q16 base stage becomes high level, audion Q16 turns on, operational amplifier U10 anti-phase input terminal voltage is approximately zero, and operational amplifier U10 exports high level.MOSFET pipe Q10 gate source voltage is less than its Vgs (th) voltage, and MOSFET pipe turns off, and load supplying disconnects, it is achieved load supplying can turn off.
Below in conjunction with circuit diagram, the control process of the present invention is described further, but this embodiment should not be construed limitation of the present invention.
The input voltage of its working environment range for 10V～32V, current threshold is 1A, and it is 2.5V that three end voltage-reference diode U11 are supplied to the reference voltage of resistance R24.The resistance of each resistance as shown in Figure 3, flows through electric current and the resistance R24 approximately equal of resistance R18, then the voltage of node Node2 is UNode2=Vin-2.5/ (R24) * (R18)=Vin-5, node Node1 and node Node2 pressure reduction is: Vin-(Vin-5V)=5V.
When external control signal SW_CTRL is high level, audion Q14, audion Q16 ends, then the positive reverse inter-input-ing voltage of operational amplifier U10 is respectively as follows:
U+=5*R16/(R11+R16)+Vin-5=Vin-0.1076
U-=Vin-0.1*I
The positive inverting input pressure reduction of operational amplifier U10 is: △ U=U+-U-=0.1*I-0.1076.
Decision flow chart is as shown in Figure 4: as operational amplifier U10 △ U=0.1*I-0.1076 > 0, illustrating that load current exceedes current threshold 1A, load current crosses stream, and operational amplifier U10 exports high level, and MOSFET pipe turns off, and load supplying disconnects；As operation amplifier U10 △ U=0.1*I-0.1076, < when 0, load current undercurrent, operational amplifier U10 output low level, metal-oxide-semiconductor turns on, and load supplying is opened.
When external control signal SW_CTRL is low level, audion Q14, audion Q16 turn on, then the voltage of U10 inverting input is approximately: the positive inverting input pressure reduction of U-=0, operational amplifier U10 and is: △ U=U+-U-=Vin-0.1076 > 0.Operational amplifier U10 △ U > 0, operational amplifier U10 export high level, and MOSFET pipe turns off, and load supplying disconnects.
The above is the preferred embodiments of the present invention, it is noted that for those skilled in the art, under the premise without departing from the principles of the invention, it is possible to make some improvement, and these improvement are also considered as protection scope of the present invention.The content not being described in detail in this specification belongs to the known prior art of professional and technical personnel in the field.
Claims (8)
1. a base station powers and can turn off the current protecting circuit of high-precision quick response, it is characterized in that: include power supply (1), input buffer circuit (2), inspection leakage resistance (3), switching tube circuit (4), power output circuit (5), the signal detection that can arrange current threshold processes circuit (8), the constant-current source bias circuit (7) that current threshold can be ensured not change with input voltage and change, external control signal can be introduced and process control signal process circuit (9) controlling switching tube break-make together with circuit and load (6) with signal detection；Described input buffer circuit (2) input connects power supply (1), outfan connects inspection leakage resistance (3), inspection leakage resistance (3) other end connecting valve pipe circuit (4) input, described switching tube circuit (4) outfan connects power output circuit (5) input, and power output circuit outfan connects load (6)；Described signal detection processes circuit (8) and includes operational amplifier U10, and the normal phase input end of described operational amplifier U10 and inverting input connect inspection leakage resistance two ends, described operational amplifier U10 outfan connecting valve another input of pipe circuit respectively；Described constant-current source bias circuit (7) outfan connects the normal phase input end of described operational amplifier U10, and described control signal processes an outfan of circuit (9) and connects the inverting input of described operational amplifier U10, another outfan concatenation operation amplifier U10 outfan；Described control signal processes circuit (9) and includes audion Q12, audion Q14, audion Q15, audion Q16, resistance R14 and resistance R15, audion Q15 base stage connects external control signal through resistance R15, grounded emitter, colelctor electrode is through resistance R14 connecting triode Q12 base stage, described audion Q12 grounded emitter, colelctor electrode connecting triode Q14 base stage, described audion Q14 grounded emitter, colelctor electrode concatenation operation amplifier U10 inverting input, described audion Q16 base stage connecting triode Q12 base stage, grounded emitter, colelctor electrode concatenation operation amplifier U10 inverting input.
2. a kind of base station according to claim 1 powers and can turn off the current protecting circuit of high-precision quick response; it is characterized in that: described signal detection processes circuit (8) and also includes resistance R11, resistance R12, resistance R16; described resistance R11 is connected between operational amplifier U10 normal phase input end and inspection leakage resistance one end; described resistance R16 is connected between operational amplifier U10 normal phase input end and constant-current source bias circuit output end, and described resistance R12 is connected between operational amplifier U10 inverting input and the inspection leakage resistance other end.
3. a kind of base station according to claim 2 powers and can turn off the current protecting circuit of high-precision quick response; it is characterized in that: described constant-current source bias circuit (7) includes+5V power supply, three end voltage-reference diode U11, audion Q13, resistance R18, resistance R20 and resistance R24, No. 1 terminal connecting triode Q13 emitter stage of described three end voltage-reference diode U11, No. 2 terminal connecting triode Q13 base stages, No. 3 terminal ground；Described audion Q13 colelctor electrode connects resistance R18 and resistance R16, and the resistance R18 other end is connected between input buffer circuit and inspection leakage resistance；Described resistance R20 one end connects+5V power supply, other end connecting triode Q13 base stage；Described resistance R24 one end connecting triode Q13 emitter stage, other end ground connection.
4. a kind of base station according to claim 1 powers and can turn off the current protecting circuit of high-precision quick response; it is characterized in that: described control signal processes circuit (9) and also includes electric capacity C12, electric capacity C13; described electric capacity C12 two ends are concatenation operation amplifier U10 inverting input and operational amplifier U10 outfan, described electric capacity C13 one end connecting triode Q12 colelctor electrode, other end ground connection respectively.
5. a kind of base station according to claim 1 powers and can turn off the current protecting circuit of high-precision quick response; it is characterized in that: described control signal processes circuit (9) and also includes+5V power supply, resistance R17, resistance R19, resistance R13; described resistance R17 one end concatenation operation amplifier U10 outfan, other end connecting triode Q12 colelctor electrode; described resistance R19 one end is connected between input buffer circuit and inspection leakage resistance, other end connecting triode Q15 colelctor electrode, and described resistance R13 one end connects+5V power supply, the other end connects resistance R15.
6. a kind of base station according to claim 1 powers and can turn off the current protecting circuit of high-precision quick response, it is characterised in that: described input buffer circuit (2) includes the inductance L10 that one end connects power supply, the other end connects inspection leakage resistance and three ground capacities being connected between inductance L10 and inspection leakage resistance.
7. a kind of base station according to claim 1 powers and can turn off the current protecting circuit of high-precision quick response; it is characterized in that: described switching tube circuit (4) includes MOSFET pipe, electric capacity and transient voltage suppressor diode; electric capacity is connected between grid and the source electrode of MOSFET pipe; transient voltage suppressor diode and Capacitance parallel connection, the outfan of grid concatenation operation amplifier U10 of described MOSFET pipe, source electrode connect inspection leakage resistance, drain electrode connects power output circuit.
8. a kind of base station according to claim 7 powers and can turn off the current protecting circuit of high-precision quick response, it is characterised in that: described power output circuit (5) includes one end connection MOSFET pipe drain electrode, the other end connects the inductance L11 of load and connects the ground capacity C11 of MOSFET pipe drain electrode.
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| CN201310749847.5A CN103701088B (en) | 2013-12-30 | 2013-12-30 | A kind of base station powers and can turn off the current protecting circuit of high-precision quick response |
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| CN201310749847.5A CN103701088B (en) | 2013-12-30 | 2013-12-30 | A kind of base station powers and can turn off the current protecting circuit of high-precision quick response |
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| CN103701088B true CN103701088B (en) | 2016-06-29 |
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| CN102130436A (en) * | 2010-01-18 | 2011-07-20 | 西门子公司 | Circuit and method for monitoring load current as well as fire alarm control device |
| EP2367274A2 (en) * | 2010-03-16 | 2011-09-21 | Monolithic Power Systems, Inc. | Switching mode power supply with primary side control and the method thereof |
| CN103248038A (en) * | 2012-02-13 | 2013-08-14 | 中国移动通信集团甘肃有限公司 | Base station power supply network system and base station emergency power supply method |
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