CN207801762U - Remote power feeding central office terminal circuit and remote power feeding central office terminal - Google Patents

Abstract

The utility model discloses a kind of remote power feeding central office terminal circuit and remote power feeding central office terminal, which includes input circuit unit, output circuit unit, half-bridge power inverter unit, the drive circuit unit for driving the work of half-bridge power inverter unit, regulator circuit unit, current foldback circuit unit and the control circuit unit for controlling drive circuit unit, regulator circuit unit and current foldback circuit cell operation；Input circuit unit is connect through half-bridge power inverter unit with output circuit unit; regulator circuit unit and current foldback circuit unit are respectively connect with output circuit unit and control circuit unit; the driving input terminal of drive circuit unit and the control output end of control circuit unit connect, and the drive output of drive circuit unit is connect with the control signal of half-bridge power inverter unit.The utility model disclosure satisfy that a variety of power demands of apparatus for remote communication.

Description

Remote power feeding central office terminal circuit and remote power feeding central office terminal

Technical field

The utility model is related to remote power feeding field more particularly to a kind of remote power feeding central office terminal circuit and remote power feeding offices Terminal.

Background technology

With the development of communication network, there are more and more data services and the application of multimedia service, and communicates The power quality of equipment directly influences the quality of communication quality, the peace of the reliability of communication equipment and staff with safety Entirely.Coordination is needed since current city is electrically accessed difficult, construction, power equipment maintaining, voltage fluctuation, is easily struck by lightning and human factor causes Power failure etc. all directly affects the stabilization and telecommunication service quality of signal of communication.Currently, existing DC remote power supply equipment in the market, Since its input and output voltage is all more single, a variety of of apparatus for remote communication cannot be met so as to cause the DC remote power supply equipment Power demands.Therefore, design one kind is by photoelectric compound cable or the communications cable is powered to remote equipment and input and output voltage Adjustable remote power feeding central office terminal is urgently to be resolved hurrily.

Utility model content

The main purpose of the utility model is to provide a kind of remote power feeding central office terminal circuits, it is intended to it is remote to solve existing direct current The technical issues of cannot meeting a variety of power demands of apparatus for remote communication for equipment.

To achieve the goals above, the utility model provides a kind of remote power feeding central office terminal circuit, the remote power feeding office Terminal circuit include for the power supply of input carry out rectifying and wave-filtering processing and export the first DC power supply input circuit unit, For exporting the output circuit unit of target power, for described defeated to control to first DC power supply progress power conversion Go out circuit unit and exports the half-bridge power inverter unit of the target power, for driving the half-bridge power translation circuit The drive circuit unit of cell operation, is used for institute the regulator circuit unit for carrying out steady pressure treatment to the target power It states target power and carries out the current foldback circuit unit of overcurrent protection and for controlling the drive circuit unit, described steady The control circuit unit of volt circuit unit and the current foldback circuit cell operation；Wherein：

Described in the input circuit unit is connect through the half-bridge power inverter unit with the output circuit unit Regulator circuit unit and the current foldback circuit unit respectively with the output circuit unit and the control circuit unit Connection, the driving input terminal of the drive circuit unit are connect with the control output end of the control circuit unit, the driving The drive output of circuit unit is connect with the control signal of the half-bridge power inverter unit.

Preferably, the half-bridge power inverter unit includes first resistor, second resistance, the first electrolytic capacitor, Two electrolytic capacitors, the first capacitance, the second capacitance, the first metal-oxide-semiconductor, the second metal-oxide-semiconductor, third metal-oxide-semiconductor and the 4th metal-oxide-semiconductor；Wherein：

The drain electrode of first metal-oxide-semiconductor is the signal input part of the half-bridge power inverter unit, with the input The signal output end of circuit unit connects, and the drain electrode of first metal-oxide-semiconductor is also connect with the drain electrode of second metal-oxide-semiconductor, described The source electrode of first metal-oxide-semiconductor is connect with the drain electrode of the third metal-oxide-semiconductor, the source electrode of second metal-oxide-semiconductor and the 4th metal-oxide-semiconductor Drain electrode connection, the source grounding of the source electrode of the third metal-oxide-semiconductor and the 4th metal-oxide-semiconductor, the grid of first metal-oxide-semiconductor, The grid of the grid of second metal-oxide-semiconductor, the grid of the third metal-oxide-semiconductor and the 4th metal-oxide-semiconductor is the half-bridge power The grid of the control signal of inverter unit, the grid of first metal-oxide-semiconductor and second metal-oxide-semiconductor and driving electricity The first drive output connection of road unit, the grid of the 3rd MOS pipes and the grid of the 4th metal-oxide-semiconductor and the drive The second drive output connection of dynamic circuit unit, the source electrode of first metal-oxide-semiconductor, the draining of the third metal-oxide-semiconductor, described the The drain electrode of the source electrode of two MOS pipes and the 4th metal-oxide-semiconductor is connect with the third drive output of the drive circuit unit；

The first end of the first resistor is connect with the drain electrode of first metal-oxide-semiconductor, the second end warp of the first resistor The second resistance ground connection；The anode of first electrolytic capacitor is connect with the first end of the first resistor, first electricity The cathode of solution capacitance is connect with the second end of the first resistor；The anode of second electrolytic capacitor is electric with described first respectively Solve the cathode of capacitance and the second end connection of the first resistor, the cathode ground connection of second electrolytic capacitor；First electricity Hold and is connect with the positive of one end and second electrolytic capacitor after the second capacitance parallel connection, first capacitance and described the The other end is the signal output end of the half-bridge power inverter unit, the half-bridge power translation circuit after two capacitance parallel connections The signal output end of unit is connect with the signal input part of the output circuit unit.

Preferably, the drive circuit unit includes operating voltage input terminal, the first driving input terminal, the second driving input End, the first drive output, the second drive output, third drive output, 3rd resistor, the 4th resistance, the 5th resistance, Six resistance, the 7th resistance, the 8th resistance, the 9th resistance, the tenth resistance, eleventh resistor, twelfth resistor, thirteenth resistor, 14th resistance, the 15th resistance, the 16th resistance, the first zener diode, the second zener diode, the first NPN triode, Second NPN triode, third NPN triode, the 4th NPN triode, the first PNP triode, the second PNP triode, the 3rd PNP Triode, the 4th PNP triode and the first transformer；Wherein：

The first driving input terminal is connect with the first control output end of the control circuit unit, second driving Input terminal is connect with the second control output end of the control circuit unit, and the first end of the 3rd resistor is driven with described first Dynamic input terminal connection, the second end of the 3rd resistor respectively with the base stage of first NPN triode, the 2nd NPN tri- The base stage of the base stage of pole pipe, the base stage of the first PNN triodes and the 2nd PNN triodes connects, first NPN triode Collector and the collector of second NPN triode connect with the operating voltage input terminal, the first NPN tri- The emitter of pole pipe is connect with the emitter of first PNP triode, the emitter of second NPN triode and described the The emitter of two PNP triodes connects, the collector of the first PNN triodes and the collector of the 2nd PNN triodes It is grounded；The emitter of first NPN triode and the emitter of second NPN triode also through the 7th resistance with it is described First armature winding input terminal of the first transformer connects, the 8th resistance and the 7th resistor coupled in parallel；

The first end of 4th resistance is connect with the first driving input terminal, the second termination of the 4th resistance Ground, the first end ground connection of the 5th resistance, the second end of the 5th resistance are connect with the second driving input terminal；It is described The first end of 6th resistance is connect with the second driving input terminal, the second end of the 6th resistance respectively with the third The base stage of NPN triode, the base stage of the 4th NPN triode, the base stage of the 3rd PNN triodes and tri- poles the 4th PNN The base stage of pipe connects, the collector of the collector of the third NPN triode and the 4th NPN triode with the work Voltage input end connects, and the emitter of the third NPN triode is connect with the emitter of the third PNP triode, described The emitter of 4th NPN triode is connect with the emitter of the 4th PNP triode, the current collection of the 3rd PNN triodes The collector of pole and the 4th PNN triodes is grounded；The emitter of the third NPN triode and the 4th NPN tri- The emitter of pole pipe is also connect through the 9th resistance with the second armature winding input terminal of first transformer, the tenth resistance With the 9th resistor coupled in parallel；

The first end of the first end of the eleventh resistor and the twelfth resistor with first transformer One armature winding output end connects, the second end of the eleventh resistor, the first end of the thirteenth resistor and described first The cathode of zener diode is connect with first drive output, the third secondary output end of first transformer, institute State the anode of the second end of twelfth resistor, the second end of the thirteenth resistor and first zener diode with it is described Third drive output connects；The first end of 16th resistance and the first end of the 14th resistance are with described first Second armature winding output end of transformer connects, the second end of the 16th resistance, the first end of the 15th resistance And the anode of second zener diode is connect with second drive output, the 4th grade of first transformer Output end, the second end of the 14th resistance, the second end of the 15th resistance and the moon of second zener diode Extremely it is grounded.

Preferably, the control circuit unit includes PWM chip, the 5th NPN triode, the 17th resistance, the 18th electricity Resistance, the 19th resistance, the 20th resistance, the 21st resistance, the 22nd resistance, the 23rd resistance, the 24th resistance, Third capacitance, the 4th capacitance, the 5th capacitance, the 6th capacitance and third electrolytic capacitor；Wherein：

The first end of 17th resistance is the control signal of the control circuit unit, the 17th resistance First end is connect with the protection signal output end of the current foldback circuit unit, the second end of the 17th resistance with it is described The base stage of 5th NPN triode connects, the emitter ground connection of the 5th NPN triode, the current collection of the 5th NPN triode The 18th resistance of pole is connect with the SOFT_START pins of the positive and described PWM chip of third electrolytic capacitor respectively, described 19th resistance and the 18th resistor coupled in parallel；The cathode of the third electrolytic capacitor is grounded；The PWM chip DISCHARGE pins are connect with the first end of the CT pins of the PWM chip and third capacitance respectively through the 22nd resistance, institute The RT pins for stating PWM chip are connect through the 20th resistance with the first end of the 21st resistance, the second end of the 21st resistance Ground connection；+ VI the pins and VC pins of the PWM chip are connect with the operating voltage input terminal, the VC of the PWM chip Through the 6th capacity earth, the OUTPUT B pins of the PWM chip are the control circuit unit for pin and GROUND pins The first control output end, the OUTPUT A pins of the PWM chip are the second control output end of the control circuit unit, The SHUTDOWN pins of the PWM chip are through the 24th resistance eutral grounding, and the 5th capacitance and the 24th resistance are simultaneously Connection；The NI INPUT pins of the PWM chip are connect through the 4th capacitance with the COMP pins of the PWM chip, and described 23 resistance are in parallel with the 4th capacitance；NI INPUT pins, INV INPUT pins and the VREF of the PWM chip draw Foot is connect with the regulator circuit unit.

Preferably, the regulator circuit unit includes third zener diode, the 4th zener diode, two pole of the 5th voltage stabilizing Pipe, the 6th zener diode, the 7th zener diode, the 8th zener diode, the 9th zener diode, two pole of the tenth voltage stabilizing Pipe, the 11st zener diode, the 12nd zener diode, rheostat, the 25th resistance, the 26th resistance, the 20th Seven resistance, the 28th resistance, the 29th resistance, the 30th resistance, the 31st resistance and the 32nd resistance；Wherein：

Third zener diode, the 4th zener diode, the 5th zener diode, the 6th zener diode, the 7th voltage stabilizing Diode, the 8th zener diode, the 9th zener diode, the tenth zener diode, the 11st zener diode and described 12 zener diodes are sequentially connected in series, and the cathode of the third zener diode is defeated for the signal of the regulator circuit unit Enter end, the signal input part of the regulator circuit unit is connect with the first sampled output of the output circuit unit, described The anode of 12nd zener diode is connect with the rheostatic first end, the rheostatic second end and the rheostat Adjustable side connection, the rheostatic second end also INV INPUT pins through the 31st resistance Yu the PWM chip Connection, the first end of the 32nd resistance are connect with the NI INPUT pins of the PWM chip, the 32nd resistance Second end connect with the VREF pins of the PWM chip；25th resistance is in parallel with the third zener diode, 26th resistance is in parallel with the 4th zener diode, the 27th resistance and the 5th zener diode Parallel connection, the 28th resistance is in parallel with the 6th zener diode, the 29th resistance and the 7th voltage stabilizing Diodes in parallel, the 30th resistance are in parallel with the 8th zener diode.

Preferably, the output circuit unit includes the second transformer, the first diode, the second diode, the three or two pole Pipe, the 4th diode, the 5th diode, the 6th diode, the 7th diode, the 8th diode, the 9th diode, the first electricity Sense, the second inductance, the 4th electrolytic capacitor, the 5th electrolytic capacitor, the 6th electrolytic capacitor, the 7th electrolytic capacitor, the 33rd resistance, 34th resistance, the 35th resistance, the 36th resistance, the 37th resistance, the 38th resistance, the 39th electricity Resistance, the 40th resistance, the 41st resistance, the 42nd resistance, the 43rd resistance, the 44th resistance, the 45th electricity Resistance, the 46th resistance and light emitting diode；Wherein：

First primary input terminal of second transformer be the output circuit unit signal input part, described second First primary input terminal of transformer is connect with the signal output end of the half-bridge power inverter unit, second transformation Second primary input terminal of device is connect with the third drive output of the drive circuit unit；First diode, second Diode, third diode and the 4th diode are sequentially connected in series, the anode of first diode and second transformation First secondary output end of device connects, and the cathode of the 4th diode is connect with the first end of first inductance；

5th diode, the 6th diode, the 7th diode and the 8th diode are sequentially connected in series, and the described 5th The anode of diode is connect with the second subprime output end of second transformer, the cathode of the 8th diode and described the The first end of one inductance connects；33rd resistance and the first diodes in parallel, the 34th resistance and the two or two Pole pipe is in parallel, the 35th resistance and third diodes in parallel, the 36th resistance and the 4th diodes in parallel, institute State the 37th resistance and the 5th diodes in parallel, the 38th resistance and the 6th diodes in parallel, the described 39th Resistance and the 7th diodes in parallel, the 40th resistance and the 8th diodes in parallel；The second end of first inductance and the The first end of 43 resistance connects, and the first end of the 43rd resistance is the first sampling output of the output circuit unit End, the second end of the 43rd resistance are the second sampled output of the output circuit unit, the second of the 43rd resistance End is connect through the second inductance with the anode of the 9th diode, and the cathode of the 9th diode is defeated for the voltage of the output circuit unit Outlet；

The anode of 4th electrolytic capacitor is connect with the second end of the first inductance, the cathode and the 5th of the 4th electrolytic capacitor The anode connection of electrolytic capacitor, the first end of the 41st resistance are connect with the second end of the first inductance, the 41st resistance Second end is connect with the first end of the cathode of the 4th electrolytic capacitor and the 42nd resistance respectively, the cathode of the 5th electrolytic capacitor and The second end of 42nd resistance is grounded；The first end of 44th resistance, the anode and the 45th of the 6th electrolytic capacitor The first end of resistance is connect with the anode of the 9th diode, and the second end of the 44th resistance and the anode of light emitting diode connect It connects, the minus earth of light emitting diode；The cathode of 6th electrolytic capacitor is connect with the anode of the 7th electrolytic capacitor, the 45th electricity The second end of resistance is connect with the first end of the cathode of the 6th electrolytic capacitor and the 46th resistance respectively, and the 7th electrolytic capacitor is born The second end of pole and the 46th resistance is grounded.

Preferably, the current foldback circuit unit includes the 47th resistance, the 48th resistance, the 49th electricity Resistance, the 50th resistance, the 51st resistance, the 7th capacitance, optocoupler and the 6th NPN triode；Wherein：

First sampling of the anode of light emitting diode through the 47th resistance and the output circuit unit in the optocoupler Output end connects, and the cathode of light emitting diode is connect with the second sampled output of the output circuit unit in the optocoupler, 7th capacitance connection is described in the optocoupler in the anode and optocoupler of light emitting diode between the cathode of light emitting diode The collector of triode is connect through the 48th resistance with the first end of the 49th resistance in optocoupler, and the of the 49th resistance Two ends are connect with the operating voltage input terminal, and the collector of triode is also through the 50th resistance and the 6th NPN in the optocoupler The base stage of triode connects, and the collector of the 6th NPN triode is through the 51st resistance and the operating voltage input terminal Connection, the emitter ground connection of the 6th NPN triode, the extremely described current foldback circuit list of current collection of the 6th NPN triode The protection signal output end of member, the collector of the 6th NPN triode connect with the control signal of the control circuit unit It connects.

Preferably, first metal-oxide-semiconductor, the second metal-oxide-semiconductor, third metal-oxide-semiconductor and the 4th metal-oxide-semiconductor are NMOS tube.

In addition, to achieve the above object, the utility model also provides a kind of remote power feeding central office terminal, the remote power feeding office Terminal includes remote power feeding central office terminal as described above circuit.

The utility model provides a kind of remote power feeding central office terminal circuit, which includes being used for Rectifying and wave-filtering processing is carried out to the power supply of input and exports the input circuit unit of the first DC power supply, for exporting target power Output circuit unit, for carrying out power conversion to first DC power supply export institute to control the output circuit unit Half-bridge power inverter unit, the driving electricity for driving the half-bridge power inverter unit work for stating target power Road unit, for the target power carry out steady pressure treatment regulator circuit unit, for being carried out to the target power Flow the current foldback circuit unit of protection and for controlling the drive circuit unit, the regulator circuit unit and described The control circuit unit of current foldback circuit cell operation；The input circuit unit is through the half-bridge power inverter unit Connect with the output circuit unit, the regulator circuit unit and the current foldback circuit unit respectively with the output Circuit unit and control circuit unit connection, driving input terminal and the control circuit unit of the drive circuit unit Control output end connection, the control of the drive output of the drive circuit unit and the half-bridge power inverter unit Input terminal connects.For the utility model since input and output voltage is adjustable, it is remote that the utility model can solve existing direct current The technical issues of cannot meeting a variety of power demands of apparatus for remote communication for equipment.

Description of the drawings

In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is only It is some embodiments of the utility model, for those of ordinary skill in the art, in the premise not made the creative labor Under, the structure that can also be shown according to these attached drawings obtains other attached drawings.

Fig. 1 is one embodiment functions of modules schematic diagram of the utility model remote power feeding central office terminal circuit；

Fig. 2 is the structure of half-bridge power inverter unit in one embodiment of the utility model remote power feeding central office terminal circuit Schematic diagram；

Fig. 3 is the structural schematic diagram of drive circuit unit in one embodiment of the utility model remote power feeding central office terminal circuit；

Fig. 4 is control circuit unit and regulator circuit unit in one embodiment of the utility model remote power feeding central office terminal circuit Structural schematic diagram；

Fig. 5 is output circuit unit and current foldback circuit in one embodiment of the utility model remote power feeding central office terminal circuit The structural schematic diagram of unit.

The embodiments will be further described with reference to the accompanying drawings for the realization, functional characteristics and advantage of the utility model aim.

Specific implementation mode

It should be appreciated that specific embodiment described herein is only used to explain the utility model, it is not used to limit this Utility model.

The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model Clearly and completely describing, it is clear that described embodiment is only a part of the embodiment of the utility model, rather than all Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are not making creative work premise Lower obtained every other embodiment, shall fall within the protection scope of the present invention.

It is to be appreciated that if the description for being related to " first ", " second " etc. in the present invention is used for description purposes only, without It can be interpreted as indicating or implying its relative importance or implicitly indicate the quantity of indicated technical characteristic.It defines as a result, The feature of " first ", " second " can explicitly or implicitly include at least one of the features.In addition, between each embodiment Technical solution can be combined with each other, but must can be implemented as basis with those of ordinary skill in the art, work as technical solution Combination there is conflicting or cannot achieve when and will be understood that the combination of this technical solution is not present, it is also not new in this practicality Within the protection domain that type requires.

The utility model provides a kind of remote power feeding central office terminal circuit, and Fig. 1 is that the utility model remote power feeding local side is electromechanical One embodiment functions of modules schematic diagram of road, referring to Fig.1, in the present embodiment, which includes input circuit Unit 101, output circuit unit 102, half-bridge power inverter unit 103, drive circuit unit 104, regulator circuit unit 105, current foldback circuit unit 106 and control circuit unit 107.

Wherein, the input circuit unit 101 carries out rectifying and wave-filtering processing for the power supply to input and exports first directly Galvanic electricity source is to the half-bridge power inverter unit 103；

The output circuit unit 102, for exporting target power；

The half-bridge power inverter unit 102, described first for being exported to the input circuit unit 101 are straight Galvanic electricity source carries out power conversion and exports the target power to control the output circuit unit 102；

The drive circuit unit 104, for driving the half-bridge power translation circuit list 103 to work；

The regulator circuit unit 105, the target power for being exported to the output circuit unit 102 carry out steady Pressure processing；

The current foldback circuit unit 106, the target power for exporting to the output circuit unit 102 into Row overcurrent protection；

The control circuit unit 107, for controlling the driving circuit list 104, the regulator circuit unit 105 and institute State the work of current foldback circuit unit 106.

Specifically, in the present embodiment, the output end DC1 of the input circuit unit 101 converts electricity through the half-bridge power Road unit 103 is connect with the output circuit unit 102, the regulator circuit unit 105 and the current foldback circuit unit 106 respectively connect with the output circuit unit 102 and the control circuit unit 107, the drive circuit unit 104 Driving input terminal is connect with the control output end of the control circuit unit 107, and the driving of the drive circuit unit 104 is defeated Outlet is connect with the control signal of the half-bridge power inverter unit 103.

Fig. 2 is the structure of half-bridge power inverter unit in one embodiment of the utility model remote power feeding central office terminal circuit Schematic diagram, Fig. 3 are the structural schematic diagram of drive circuit unit in one embodiment of the utility model remote power feeding central office terminal circuit, figure 4 be the structural representation of control circuit unit and regulator circuit unit in one embodiment of the utility model remote power feeding central office terminal circuit Figure, Fig. 5 are output circuit unit and current foldback circuit unit in one embodiment of the utility model remote power feeding central office terminal circuit Structural schematic diagram, together referring to Fig.1, Fig. 2, Fig. 3, Fig. 4 and Fig. 5, in the present embodiment, the half-bridge power inverter unit 103 include first resistor R1, second resistance R2, the first electrolytic capacitor E1, the second electrolytic capacitor E2, the first capacitance C1, the second electricity Hold C2, the first metal-oxide-semiconductor M1, the second metal-oxide-semiconductor M2, the 3rd MOS pipes M3 and the 4th metal-oxide-semiconductor M4.

Specifically, the drain electrode of the first metal-oxide-semiconductor M1 is that the signal of the half-bridge power inverter unit 103 inputs Hold IN2, the signal input part IN2 and the signal of the input circuit unit 101 of the half-bridge power inverter unit 103 defeated The drain electrode of outlet DC1 connections, the first metal-oxide-semiconductor M1 is also connect with the drain electrode of the second metal-oxide-semiconductor M2, first metal-oxide-semiconductor The source electrode of M1 is connect with the drain electrode of the third metal-oxide-semiconductor M3, and the source electrode of the second metal-oxide-semiconductor M2 is with the 4th metal-oxide-semiconductor M4's Drain electrode connection, the source grounding of the source electrode and the 4th metal-oxide-semiconductor M4 of the third metal-oxide-semiconductor M3, the first metal-oxide-semiconductor M1's Grid, the grid of the second metal-oxide-semiconductor M2, the grid of the third metal-oxide-semiconductor M3 and the grid of the 4th metal-oxide-semiconductor M4 are institute State the control signal of half-bridge power inverter unit 103, the grid of the first metal-oxide-semiconductor M1 and the 2nd MOS pipes M2 Grid connect with the first drive output PWM_B_OUT of the drive circuit unit 104, the grid of the third metal-oxide-semiconductor M3 The grid of pole and the 4th metal-oxide-semiconductor M4 are connect with the second drive output PWM_A_OUT of the drive circuit unit 104, The source electrode of the first metal-oxide-semiconductor M1, the draining of the third metal-oxide-semiconductor M3, the source electrode and the described 4th of the second metal-oxide-semiconductor M2 The drain electrode of metal-oxide-semiconductor M4 is connect with the third drive output DC3 of the drive circuit unit 104；

The first end of the first resistor R1 is connect with the drain electrode of the first metal-oxide-semiconductor M1, and the of the first resistor R1 Two ends are grounded through the second resistance R2；The anode of the first electrolytic capacitor E1 connects with the first end of the first resistor R1 It connects, the cathode of the first electrolytic capacitor E1 is connect with the second end of the first resistor R1；The second electrolytic capacitor E2's Anode is connect with the second end of the cathode of the first electrolytic capacitor E1 and the first resistor R1 respectively, the second electrolysis electricity Hold the cathode ground connection of E2；One end after the first capacitance C1 is in parallel with the second capacitance C2 and the second electrolytic capacitor E2 Anode connection, after the first capacitance C1 is in parallel with the second capacitance C2 the other end be the half-bridge power translation circuit list The signal output end DC2 of member 103, signal output end DC2 and the output circuit of the half-bridge power inverter unit 103 Unit 102 connects.

In the present embodiment, the first metal-oxide-semiconductor M1, the second metal-oxide-semiconductor M2, third metal-oxide-semiconductor M3 and the 4th metal-oxide-semiconductor M4 are NMOS tube.The first capacitance C1 and the second capacitance C2 is for being isolated high-frequency direct-current component.It should be noted that this reality It applies in example, the PGND in figure is input ground, and NGD is output ground.

In the present embodiment, the drive circuit unit 104 includes operating voltage input terminal VCC, the first driving input terminal PWM_B, the second driving input terminal PWM_A, the first drive output PWM_B_OUT, the second drive output PWM_A_OUT, the Three drive output DC3,3rd resistor R3, the 4th resistance R4, the 5th resistance R5, the 6th resistance R6, the 7th resistance R7, the 8th electricity Hinder R8, the 9th resistance R9, the tenth resistance R10, eleventh resistor R11, twelfth resistor R12, thirteenth resistor R13, the 14th Resistance R14, the 15th resistance R15, the 16th resistance R16, the first zener diode ZD1, the second zener diode ZD2, first NPN triode Q1, the second NPN triode Q2, the 3rd NPN triodes Q3, the 4th NPN triode Q4, the first PNP triode Q11, the second PNP triode Q12, third PNP triode Q13, the 4th PNP triode Q14 and the first transformer T1.

Specifically, the first driving input terminal PWM_B and the first control output end of the control circuit unit 107 connect It connects, the second driving input terminal PWM_A is connect with the second control output end of the control circuit unit 107, the third The first end of resistance R3 is connect with the first driving input terminal PWM_B, the second end of the 3rd resistor R3 respectively with it is described The base stage of first NPN triode Q1, the base stage of the second NPN triode Q2, the base stage of the first PNN triodes Q11 and described The base stage connection of 2nd PNN triodes Q12, the collector of first NPN triode Q1 and the second NPN triode Q2's Collector is connect with the operating voltage input terminal VCC, the emitter of first NPN triode Q1 and the first PNP The emitter of triode Q11 connects, the transmitting of the emitter of the second NPN triode Q2 and the second PNP triode Q12 Pole connects, and the collector of the first PNN triodes Q11 and the collector of the 2nd PNN triodes Q12 are grounded；It is described The emitter of the emitter of first NPN triode Q1 and the second NPN triode Q2 are also through the 7th resistance R7 and described first The first armature winding input terminal a connections of transformer T1, the 8th resistance R8 are in parallel with the 7th resistance R7；

The first end of the 4th resistance R4 is connect with the first driving input terminal PWM_B, the 4th resistance R4's Second end is grounded, the first end ground connection of the 5th resistance R5, and the second end of the 5th resistance R5 and second driving are defeated Enter PWM_A is held to connect；

The first end of the 6th resistance R6 is connect with the second driving input terminal PWM_A, the 6th resistance R6's Second end respectively with the base stage of the third NPN triode Q3, the base stage of the 4th NPN triodes Q4, tri- poles the 3rd PNN The base stage of pipe Q13 and the connection of the base stage of the 4th PNN triodes Q14, the collector of the third NPN triode Q3 and institute The collector for stating the 4th NPN triode Q4 is connect with the operating voltage input terminal VCC, the third NPN triode Q3's Emitter is connect with the emitter of the third PNP triode Q13, the emitter of the 4th NPN triode Q4 and described the The emitter of four PNP triode Q14 connects, the collector and the 4th PNN triodes of the 3rd PNN triodes Q13 The collector of Q14 is grounded；The emitter of the third NPN triode Q3 and the emitter of the 4th NPN triode Q4 are also Connect with the second armature winding input terminal b of the first transformer T1 through the 9th resistance R9, the tenth resistance R10 with it is described 9th resistance R9 is in parallel；

The first end of the eleventh resistor R11 and the first end of the twelfth resistor R12 with first transformation The first armature winding output end c connections of device T1, the second end of the eleventh resistor R11, the thirteenth resistor R13 The cathode of one end and the first zener diode ZD1 are connect with the first drive output PWM_B_OUT, and described first The third secondary output end k of transformer T1, the second end of the twelfth resistor R12, the second end of the thirteenth resistor R13 And the anode of the first zener diode ZD1 is connect with the third drive output DC3；

The first end of the 16th resistance R16 and the first end of the 14th resistance R14 with first transformation The second armature winding output end d connections of device T1, the second end of the 16th resistance R16, the 15th resistance R15 The anode of one end and the second zener diode ZD2 are connect with the second drive output PWM_A_OUT, and described first The 4th secondary output end n of transformer T1, the second end of the 14th resistance R14, the second end of the 15th resistance R15 And the cathode of second zener diode is grounded.

In the present embodiment, first NPN triode Q1 and the first PNP triode Q11 form single channel recommending output mode Circuit, the second NPN triode Q2 and the second PNP triode Q12 form another single channel push-pull output circuit, two Single channel push-pull output circuit is in parallel, can increase the driving output current of the drive circuit unit 104.

In the present embodiment, the control circuit unit 107 includes PWM chip U1, the 5th NPN triode Q5, the 17th electricity Hinder Q17, the 18th resistance R18, the 19th resistance R19, the 20th resistance R20, the 21st resistance R21, the 22nd resistance R22, the 23rd resistance R23, the 24th resistance R24, third capacitance C3, the 4th capacitance C4, the 5th capacitance C5, the 6th electricity Hold C6 and third electrolytic capacitor E3.

Specifically, the first end of the 17th resistance R17 is the control signal of the control circuit unit 107 The first end of SHUT1, the 17th resistance R17 connect with the protection signal output end of the current foldback circuit unit 106 It connects, the second end of the 17th resistance R17 is connect with the base stage of the 5th NPN triode Q5, the 5th NPN triode The emitter of Q5 is grounded, the collector of the 5th NPN triodes Q5 through the 18th resistance R18 respectively with third electrolytic capacitor The SOFT_START pins of the positive and described PWM chip U1 of E3 connect, the 19th resistance R19 and the 18th electricity It is in parallel to hinder R18；The cathode of the third electrolytic capacitor E3 is grounded；The DISCHARGE pins of the PWM chip U1 are through the 20th Two resistance R22 are connect with the first end of the CT pins of the PWM chip U1 and third capacitance C3 respectively, the PWM chip U1's RT pins are connect through the 20th resistance R20 with the first end of the 21st resistance R21, the second termination of the 21st resistance R21 Ground；+ VI the pins and VC pins of the PWM chip U1 is connect with the operating voltage input terminal VCC, the PWM chip U1 VC pins and GROUND pins through the 6th capacitance C6 ground connection, the OUTPUT B pins of the PWM chip U1 are the control The OUTPUT A pins of first control output end of circuit unit 107, the PWM chip U1 are the control circuit unit 107 The second control output end, the SHUTDOWN pins of the PWM chip U1 are through the 24th resistance R24 ground connection, the 5th electricity It is in parallel with the 24th resistance R24 to hold C5；The NI INPUT pins of the PWM chip U1 through the 4th capacitance C4 with The COMP pins of the PWM chip U1 connect, and the 23rd resistance R23 is in parallel with the 4th capacitance C4；The PWM cores NI INPUT pins, INV INPUT pins and the VREF pins of piece U1 is connect with the regulator circuit unit 106.

In the present embodiment, the PWM chip U1 that the control circuit unit 107 is selected is the PWM chip of KA3525 series, institute The OUTPUT B pins for stating PWM chip U1 are the first control output end of the control circuit unit 107, first control The pwm control signal of output end output drives through the drive circuit unit 104 in the half-bridge power inverter unit 103 The first metal-oxide-semiconductor M1 and the second metal-oxide-semiconductor M2 switch motion；The OUTPUT A pins of the PWM chip U1 are Second control output end of the control circuit unit 107, described in the pwm control signal warp of second control output end output Drive circuit unit 104 drives the third metal-oxide-semiconductor M3 and the described 4th in the half-bridge power inverter unit 103 The switch motion of metal-oxide-semiconductor M4.

In the present embodiment, the regulator circuit unit 105 includes third zener diode ZD3, the 4th zener diode ZD4, the 5th zener diode ZD5, the 6th zener diode ZD6, the 7th zener diode ZD7, the 8th zener diode ZD8, 9th zener diode ZD9, the tenth zener diode ZD10, the 11st zener diode ZD11, the 12nd zener diode ZD12, rheostat RT1, the 25th resistance R25, the 26th resistance R26, the 27th resistance R27, the 28th resistance R28, the 29th resistance R29, the 30th resistance R30, the 31st resistance R31 and the 32nd resistance R32.

Specifically, the third zener diode ZD3, the 4th zener diode ZD4, the 5th zener diode ZD5, the 6th Zener diode ZD6, the 7th zener diode ZD7, the 8th zener diode ZD8, the 9th zener diode ZD9, the tenth voltage stabilizing Diode ZD10, the 11st zener diode ZD11 and the 12nd zener diode ZD12 are sequentially connected in series, and described The cathode of three zener diode ZD3 is the signal input part IN4 of the regulator circuit unit 106, the regulator circuit unit 106 Signal input part IN4 connect with the first sampled output e of the output circuit unit 102, two pole of the 12nd voltage stabilizing The anode of pipe ZD12 is connect with the first end of the rheostat RT1, the second end of the rheostat RT1 and the rheostat RT1 Adjustable side connection, the second end also INV through the 31st resistance R31 Yu the PWM chip U1 of the rheostat RT1 INPUT pins connect, and the first end of the 32nd resistance R32 is connect with the NI INPUT pins of the PWM chip U1, institute The second end for stating the 32nd resistance R32 is connect with the VREF pins of the PWM chip U1；

The 25th resistance R25 is in parallel with the third zener diode ZD3, the 26th resistance R26 with The 4th zener diode ZD4 is in parallel, and the 27th resistance R27 is in parallel with the 5th zener diode ZD5, described 28th resistance R28 is in parallel with the 6th zener diode ZD6, the 29th resistance R29 and the 7th voltage stabilizing Diode ZD7 is in parallel, and the 30th resistance R30 is in parallel with the 8th zener diode ZD8.

In the present embodiment, the third zener diode ZD3, the 4th zener diode ZD4, the 5th zener diode ZD5, 6th zener diode ZD6, the 7th zener diode ZD7, the 8th zener diode ZD8 are concatenated high voltage stabilizing pipe heaps, institute State the 9th zener diode ZD9, the tenth zener diode ZD10, the 11st zener diode ZD11, the 12nd zener diode ZD12 is concatenated low pressure voltage-stabiliser tube, the 25th resistance R25, the 26th resistance R26, the 27th resistance R27, 28 resistance R28, the 29th resistance R29, the 30th resistance R30 are divider resistances, each divider resistance respectively with it is above-mentioned Single zener diode in high voltage stabilizing pipe heap is in parallel.In the present embodiment, the regulator circuit unit 105 returns sampling Voltage (namely right end voltage of the 31st resistance R31) is sent into the reverse side of the error amplifier of the PWM chip U1, The PWM chip U1 controls its OUTPUT B pin (i.e. control circuit unit 107 by reverse phase proportional integral circuit First control output end) and OUTPUT A pins, that is, control circuit unit 107 the second control output end) exported The duty ratio of pwm control signal, to control the output circuit unit 102 voltage output end OUT5 can output voltage it is steady Fixed target power.

In the present embodiment, the output circuit unit 102 includes the second transformer T2, the first diode D1, the two or two pole Pipe D2, third diode D3, the 4th diode D4, the 5th diode D5, the 6th diode D6, the 7th diode D7, the eight or two Pole pipe D8, the 9th diode D9, the first inductance L1, the second inductance L2, the 4th electrolytic capacitor E4, the 5th electrolytic capacitor E5, the 6th Electrolytic capacitor E6, the 7th electrolytic capacitor E7, the 33rd resistance R33, the 34th resistance R34, the 35th resistance R35, 36 resistance R36, the 37th resistance R37, the 38th resistance R38, the 39th resistance R39, the 40th resistance R40, 41st resistance R41, the 42nd resistance R42, the 43rd resistance R43, the 44th resistance R44, the 45th resistance R45, the 46th resistance R46 and Light-emitting diode LED 1.In the present embodiment, the second transformer T2 is that high frequency power becomes Depressor.

Specifically, the first primary input terminal g of the second transformer T2 is the signal of the output circuit unit 102 The signal of input terminal, the first primary input terminal g and the half-bridge power inverter unit 103 of the second transformer T2 is defeated Outlet DC2 connections, the second primary input terminal h of the second transformer T2 drive with the third of the drive circuit unit 104 Output end DC3 connections；The first diode D1, the second diode D2, third diode D3 and the 4th diode D4 go here and there successively Connection connection, the anode of the first diode D1 are connect with the first secondary output end i of the second transformer T2, and the described 4th The cathode of diode D4 is connect with the first end of the first inductance L1；

The 5th diode D5, the 6th diode D6, the 7th diode D7 and the 8th diode D8 are sequentially connected in series company It connects, the anode of the 5th diode D5 is connect with the second subprime output end j of the second transformer T2, the eight or two pole The cathode of pipe D8 is connect with the first end of the first inductance L1；

The 33rd resistance R33 is in parallel with the first diode D1, the 34th resistance R34 and the two or two pole Pipe D2 is in parallel, and the 35th resistance R35 is in parallel with third diode D3, the 36th resistance R36 and the four or two pole Pipe D4 is in parallel, and the 37th resistance R37 is in parallel with the 5th diode D5, the 38th resistance R38 and the six or two pole Pipe D6 is in parallel, and the 39th resistance R39 is in parallel with the 7th diode D7, the 40th resistance R40 and the 8th diode D8 is in parallel；

The second end of the first inductance L1 is connect with the first end of the 43rd resistance R43, the 43rd resistance R43's First end is that (namely the second end of the first inductance L1 is described by the first sampled output e of the output circuit unit 102 The second end of first sampled output e), the 43rd resistance R43 of output circuit unit 102 is the output circuit unit The second end of 102 the second sampled output f, the 43rd resistance R43 is through the anode of the second inductance L2 and the 9th diode D9 Connection, the cathode of the 9th diode D9 are the voltage output end OUT5 of the output circuit unit 102；

The anode of the 4th electrolytic capacitor E4 is connect with the second end of the first inductance L1, the cathode of the 4th electrolytic capacitor D4 It being connect with the anode of the 5th electrolytic capacitor D5, the first end of the 41st resistance R41 is connect with the second end of the first inductance L1, the The second end of 41 resistance R41 connects with the first end of the cathode of the 4th electrolytic capacitor E4 and the 42nd resistance R42 respectively It connects, the cathode of the 5th electrolytic capacitor E5 and the second end of the 42nd resistance R42 are grounded；

The first of the first end of 44th resistance R44, the anode of the 6th electrolytic capacitor E6 and the 45th resistance R45 End is connect with the anode of the 9th diode D9, and the second end of the 44th resistance R44 connects with the anode of Light-emitting diode LED 1 It connects, the minus earth of Light-emitting diode LED 1；The cathode of 6th electrolytic capacitor E6 is connect with the anode of the 7th electrolytic capacitor E7, The second end of 45th resistance R45 connects with the first end of the cathode of the 6th electrolytic capacitor E6 and the 46th resistance R46 respectively It connects, the cathode of the 7th electrolytic capacitor E7 and the second end of the 46th resistance R46 are grounded.

In the present embodiment, the first diode D1, the second diode D2, third diode D3 and the 4th diode D4 are Concatenated first high-voltage rectifier bridge heap, the 33rd resistance R33, the 34th resistance R34, the 35th resistance R35, 36 resistance R36 are the voltage equalizing protection resistance of above-mentioned first high-voltage rectifier bridge heap, the 5th diode D5, the 6th diode D6, the 7th diode D7, the 8th diode D8 are that series connection is the second high-voltage rectifier bridge heap, the 37th resistance R37, the 30th Eight resistance R38, the 39th resistance R39, the 40th resistance R40 are equally the voltage equalizing protection electricity of above-mentioned second high-voltage rectifier bridge heap Resistance.In the present embodiment, the first inductance L1, the 4th electrolytic capacitor E4 and the 5th electrolytic capacitor E5 are filtered electricals Road, the second inductance L2, the 6th electrolytic capacitor E6 and the 7th electrolytic capacitor E7 are secondary filter circuits, described 41st resistance R41, the 42nd resistance R42, the 45th resistance R45 and the 46th resistance R46 It is the equalizing resistance of corresponding electrolytic capacitor.In the present embodiment, the 44th resistance R44 and the Light-emitting diode LED 1 It is composed in series output indicating circuit, when the output circuit unit 102 exports target power, the light emitting diode is to light State, when the output circuit unit 102 does not export target power, the light emitting diode is OFF state.

In the present embodiment, the current foldback circuit unit 106 includes the 47th resistance R47, the 48th resistance R48, the 49th resistance R49, the 50th resistance R50, the 51st resistance R51, the 7th capacitance C7, optocoupler U2 and the 6th NPN Triode Q6.Specifically, in the optocoupler U2 anode of light emitting diode through the 47th resistance R47 and the output circuit list First sampled output e connections of member 102, the cathode and the output circuit unit 102 of light emitting diode in the optocoupler U2 The second sampled output f connections, the 7th capacitance C7 is connected to the anode and optocoupler of light emitting diode in the optocoupler U2 In U2 between the cathode of light emitting diode, the collector of triode is through the 48th resistance R48 and the 40th in the optocoupler U2 The first end of nine resistance R49 connects, and the second end of the 49th resistance R49 is connect with the operating voltage input terminal VCC, described The collector of triode is also connect through the 50th resistance R50 with the base stage of the 6th NPN triode Q6 in optocoupler U2, and the described 6th The collector of NPN triode Q6 is connect through the 51st resistance R51 with the operating voltage input terminal VCC, tri- poles the 6th NPN The emitter of pipe Q6 is grounded, the protection letter of the current collection of the 6th NPN triode Q6 extremely current foldback circuit unit 106 Number output end, the collector of the 6th NPN triode Q6 connect with the control signal SHUT1 of the control circuit unit 107 It connects.

In the present embodiment, the 43rd resistance R43 is precision current sample resistance, electric when flowing through the described 43rd When hindering the overcurrent of R43, the voltage at the both ends the 43rd resistance R43 will become larger, and pass through the electricity in the optocoupler U2 Stream can become larger, and can thus change the size of the output current of the optocoupler U2, then by controlling the 6th NPN triode The on or off state of Q6, to trigger the overcurrent protection action of the control circuit unit 107.Specifically, when the mistake Mistake shield signal output end (collector of the i.e. described 6th NPN triode Q6) output overcurrent protection of stream protection circuit unit 106 When signal, the control circuit unit 107 executes overcurrent protection action, and the PWM chip U1 stops output pwm control signal, And then it controls the output circuit unit 102 and stops output target power.In the present embodiment, adjustment the described 48th appropriate The parameter of resistance R48, the 49th resistance R49, the 50th resistance R50, the 51st resistance R51 make tri- poles the 6th NPN Pipe Q6 is operated in magnifying state.In the present embodiment, the 7th capacitance C7 is high-frequency filter capacitor.

The present embodiment remote power feeding central office terminal's circuit due to having Voltage loop and electric current loop bicyclic system on circuit structure, because This present embodiment can improve voltage regulation factor, load regulation and transient response characteristic.The present embodiment remote power feeding central office terminal The input and output voltage of circuit is adjustable, has voltage stabilizing and an overcurrent protection function, and output voltage range is wide, and (output voltage range is 280V~800V), a variety of typical output voltages can be exported, so as to meet a variety of power supply need of apparatus for remote communication It asks, effectively reduces the booting website of the hydro power generation after mains failure, reduce hydro power generation cost, reduce pollution row It puts, while also ing save cost；Also, the input voltage range of the present embodiment is wide, and input voltage is either alternating current also may be used It is direct current (as inputted 220V exchanges or input -48V direct currents), the present embodiment, which also has strong antijamming capability and has input, to be prevented The advantages of reversal connection function, and then can effectively extend the service life of apparatus for remote communication and monitoring device.The present embodiment Energy conversion efficiency is up to 90% or more, and output power is up to 5000W.

The utility model also provides a kind of remote power feeding central office terminal, which includes remote power feeding central office terminal The structure of circuit, the remote power feeding central office terminal circuit can refer to above-described embodiment, and details are not described herein.Naturally, due to The remote power feeding central office terminal of the present embodiment uses the technical solution of above-mentioned remote power feeding central office terminal circuit, therefore the remote power feeding The advantageous effect that central office terminal has above-mentioned remote power feeding central office terminal circuit all.

It these are only the preferred embodiment of the utility model, it does not limit the scope of the patent of the present invention, every Equivalent structure or equivalent flow shift made based on the specification and figures of the utility model, is applied directly or indirectly in Other related technical areas are equally included in the patent within the scope of the utility model.

Claims (9)

1. a kind of remote power feeding central office terminal circuit, which is characterized in that remote power feeding central office terminal circuit includes for input Power supply carry out rectifying and wave-filtering processing and export the input circuit unit of the first DC power supply, the output for exporting target power Circuit unit exports the target for carrying out power conversion to first DC power supply to control the output circuit unit The half-bridge power inverter unit of power supply, the driving circuit list for driving the half-bridge power inverter unit work Member, is used to carry out overcurrent guarantor to the target power at the regulator circuit unit for carrying out the target power steady pressure treatment The current foldback circuit unit of shield and for controlling the drive circuit unit, the regulator circuit unit and the overcurrent Protect the control circuit unit of circuit unit work；Wherein：

The input circuit unit is connect through the half-bridge power inverter unit with the output circuit unit, the voltage stabilizing Circuit unit and the current foldback circuit unit are respectively connect with the output circuit unit and the control circuit unit, The driving input terminal of the drive circuit unit is connect with the control output end of the control circuit unit, the driving circuit list The drive output of member is connect with the control signal of the half-bridge power inverter unit.

2. remote power feeding central office terminal as described in claim 1 circuit, which is characterized in that the half-bridge power inverter unit Including first resistor, second resistance, the first electrolytic capacitor, the second electrolytic capacitor, the first capacitance, the second capacitance, the first metal-oxide-semiconductor, Second metal-oxide-semiconductor, third metal-oxide-semiconductor and the 4th metal-oxide-semiconductor；Wherein：

The drain electrode of first metal-oxide-semiconductor is the signal input part of the half-bridge power inverter unit, with the input circuit The signal output end of unit connects, and the drain electrode of first metal-oxide-semiconductor is also connect with the drain electrode of second metal-oxide-semiconductor, and described first The source electrode of metal-oxide-semiconductor is connect with the drain electrode of the third metal-oxide-semiconductor, the drain electrode of the source electrode of second metal-oxide-semiconductor and the 4th metal-oxide-semiconductor Connection, the source grounding of the source electrode of the third metal-oxide-semiconductor and the 4th metal-oxide-semiconductor are the grid of first metal-oxide-semiconductor, described The grid of the grid of second metal-oxide-semiconductor, the grid of the third metal-oxide-semiconductor and the 4th metal-oxide-semiconductor is the half-bridge power transformation The grid of the control signal of circuit unit, the grid of first metal-oxide-semiconductor and second metal-oxide-semiconductor and the driving circuit list The first drive output connection of member, the grid and the driving circuit of the grid of the third metal-oxide-semiconductor and the 4th metal-oxide-semiconductor Second drive output of unit connects, the source electrode of first metal-oxide-semiconductor, the draining of the third metal-oxide-semiconductor, the 2nd MOS The drain electrode of the source electrode of pipe and the 4th metal-oxide-semiconductor is connect with the third drive output of the drive circuit unit；

The first end of the first resistor is connect with the drain electrode of first metal-oxide-semiconductor, described in the second end warp of the first resistor Second resistance is grounded；The anode of first electrolytic capacitor is connect with the first end of the first resistor, the first electrolysis electricity The cathode of appearance is connect with the second end of the first resistor；The anode of second electrolytic capacitor is electric with first electrolysis respectively The second end of the cathode of appearance and the first resistor connects, the cathode ground connection of second electrolytic capacitor；First capacitance with One end after the second capacitance parallel connection is connect with the anode of second electrolytic capacitor, first capacitance and second electricity The other end is the signal output end of the half-bridge power inverter unit, the half-bridge power inverter unit after holding parallel connection Signal output end connect with the signal input part of the output circuit unit.

3. remote power feeding central office terminal as claimed in claim 2 circuit, which is characterized in that the drive circuit unit includes work Voltage input end, the first driving input terminal, the second driving input terminal, the first drive output, the second drive output, third are driven Dynamic output end, 3rd resistor, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, the 8th resistance, the 9th resistance, the tenth Resistance, eleventh resistor, twelfth resistor, thirteenth resistor, the 14th resistance, the 15th resistance, the 16th resistance, first are surely Press diode, the second zener diode, the first NPN triode, the second NPN triode, third NPN triode, tri- poles the 4th NPN Pipe, the first PNP triode, the second PNP triode, third PNP triode, the 4th PNP triode and the first transformer；Wherein：

The first driving input terminal is connect with the first control output end of the control circuit unit, the second driving input End is connect with the second control output end of the control circuit unit, and the first end of the 3rd resistor and first driving are defeated Enter end connection, the second end of the 3rd resistor respectively with the base stage of first NPN triode, second NPN triode Base stage, the connection of the base stage of the base stage of the first PNN triodes and the 2nd PNN triodes, the collection of first NPN triode Electrode and the collector of second NPN triode are connect with the operating voltage input terminal, first NPN triode Emitter is connect with the emitter of first PNP triode, the emitter of second NPN triode and the 2nd PNP The emitter of triode connects, and the collector of the first PNN triodes and the collector of the 2nd PNN triodes connect Ground；The emitter of first NPN triode and the emitter of second NPN triode are also through the 7th resistance and described first First armature winding input terminal of transformer connects, the 8th resistance and the 7th resistor coupled in parallel；

The first end of 4th resistance is connect with the first driving input terminal, the second end ground connection of the 4th resistance, institute The first end ground connection of the 5th resistance is stated, the second end of the 5th resistance is connect with the second driving input terminal；Described 6th The first end of resistance is connect with the second driving input terminal, the second end of the 6th resistance respectively with the 3rd NPN tri- The base of the base stage of pole pipe, the base stage of the 4th NPN triode, the base stage of the 3rd PNN triodes and the 4th PNN triodes Pole connects, and the collector of the collector of the third NPN triode and the 4th NPN triode is defeated with the operating voltage Enter end connection, the emitter of the third NPN triode is connect with the emitter of the third PNP triode, the 4th NPN The emitter of triode is connect with the emitter of the 4th PNP triode, the collector of the 3rd PNN triodes and described The collector of 4th PNN triodes is grounded；The hair of the emitter of the third NPN triode and the 4th NPN triode Emitter-base bandgap grading is also connect through the 9th resistance with the second armature winding input terminal of first transformer, the tenth resistance and described the Nine resistor coupled in parallel；

The first end of the first end of the eleventh resistor and the twelfth resistor with the first of first transformer at the beginning of Grade winding output end connection, the second end of the eleventh resistor, the first end of the thirteenth resistor and first voltage stabilizing The cathode of diode is connect with first drive output, the third secondary output end of first transformer, described The anode of the second end of 12 resistance, the second end of the thirteenth resistor and first zener diode with the third Drive output connects；The first end of 16th resistance and the first end of the 14th resistance with first transformation Second armature winding output end of device connects, the second end of the 16th resistance, the first end of the 15th resistance and institute The anode for stating the second zener diode is connect with second drive output, the 4th grade output of first transformer The cathode at end, the second end of the 14th resistance, the second end of the 15th resistance and second zener diode is equal Ground connection.

4. remote power feeding central office terminal as claimed in claim 3 circuit, which is characterized in that the control circuit unit includes PWM Chip, the 5th NPN triode, the 17th resistance, the 18th resistance, the 19th resistance, the 20th resistance, the 21st resistance, 22nd resistance, the 23rd resistance, the 24th resistance, third capacitance, the 4th capacitance, the 5th capacitance, the 6th capacitance and Third electrolytic capacitor；Wherein：

The first end of 17th resistance be the control circuit unit control signal, the first of the 17th resistance End is connect with the protection signal output end of the current foldback circuit unit, the second end and the described 5th of the 17th resistance The base stage of NPN triode connects, the emitter ground connection of the 5th NPN triode, the collector warp of the 5th NPN triode 18th resistance is connect with the SOFT_START pins of the positive and described PWM chip of third electrolytic capacitor respectively, and the described tenth Nine resistance and the 18th resistor coupled in parallel；The cathode of the third electrolytic capacitor is grounded；The DISCHARGE of the PWM chip Pin is connect with the first end of the CT pins of the PWM chip and third capacitance respectively through the 22nd resistance, the PWM chip RT pins connect with the first end of the 21st resistance through the 20th resistance, the second end of the 21st resistance ground connection；It is described + VI the pins and VC pins of PWM chip are connect with the operating voltage input terminal, the VC pins of the PWM chip and For GROUND pins through the 6th capacity earth, the OUTPUT B pins of the PWM chip are the first of the control circuit unit Control output end, the OUTPUT A pins of the PWM chip are the second control output end of the control circuit unit, described The SHUTDOWN pins of PWM chip are through the 24th resistance eutral grounding, the 5th capacitance and the 24th resistor coupled in parallel；Institute The NI INPUT pins for stating PWM chip are connect through the 4th capacitance with the COMP pins of the PWM chip, and the described 23rd Resistance is in parallel with the 4th capacitance；NI INPUT pins, INV INPUT pins and the VREF pins of the PWM chip and institute State the connection of regulator circuit unit.

5. remote power feeding central office terminal as claimed in claim 4 circuit, which is characterized in that the regulator circuit unit includes third Zener diode, the 4th zener diode, the 5th zener diode, the 6th zener diode, the 7th zener diode, the 8th are surely Press diode, the 9th zener diode, the tenth zener diode, the 11st zener diode, the 12nd zener diode, variable resistance Device, the 25th resistance, the 26th resistance, the 27th resistance, the 28th resistance, the 29th resistance, the 30th electricity Resistance, the 31st resistance and the 32nd resistance；Wherein：

Third zener diode, the 4th zener diode, the 5th zener diode, the 6th zener diode, two pole of the 7th voltage stabilizing Pipe, the 8th zener diode, the 9th zener diode, the tenth zener diode, the 11st zener diode and the described 12nd Zener diode is sequentially connected in series, and the cathode of the third zener diode is the signal input of the regulator circuit unit End, the signal input part of the regulator circuit unit connect with the first sampled output of the output circuit unit, and described the The anode of 12 zener diodes is connect with the rheostatic first end, the rheostatic second end with it is described rheostatic Adjustable side connects, and INV INPUT pin of the rheostatic second end also through the 31st resistance and the PWM chip connects It connects, the first end of the 32nd resistance is connect with the NI INPUT pins of the PWM chip, the 32nd resistance Second end is connect with the VREF pins of the PWM chip；25th resistance is in parallel with the third zener diode, institute It is in parallel with the 4th zener diode to state the 26th resistance, the 27th resistance and the 5th zener diode are simultaneously Connection, the 28th resistance is in parallel with the 6th zener diode, the 29th resistance and the 7th voltage stabilizing two Pole pipe is in parallel, and the 30th resistance is in parallel with the 8th zener diode.

6. remote power feeding central office terminal as claimed in claim 5 circuit, which is characterized in that the output circuit unit includes second Transformer, the first diode, the second diode, third diode, the 4th diode, the 5th diode, the 6th diode, the 7th Diode, the 8th diode, the 9th diode, the first inductance, the second inductance, the 4th electrolytic capacitor, the 5th electrolytic capacitor, the 6th Electrolytic capacitor, the 7th electrolytic capacitor, the 33rd resistance, the 34th resistance, the 35th resistance, the 36th resistance, 37 resistance, the 38th resistance, the 39th resistance, the 40th resistance, the 41st resistance, the 42nd resistance, 43 resistance, the 44th resistance, the 45th resistance, the 46th resistance and light emitting diode；Wherein：

First primary input terminal of second transformer is the signal input part of the output circuit unit, second transformation First primary input terminal of device is connect with the signal output end of the half-bridge power inverter unit, second transformer Second primary input terminal is connect with the third drive output of the drive circuit unit；First diode, the two or two pole Pipe, third diode and the 4th diode are sequentially connected in series, the anode of first diode and second transformer First secondary output end connects, and the cathode of the 4th diode is connect with the first end of first inductance；

5th diode, the 6th diode, the 7th diode and the 8th diode are sequentially connected in series, the five or two pole The anode of pipe is connect with the second subprime output end of second transformer, the cathode of the 8th diode and first electricity The first end of sense connects；33rd resistance and the first diodes in parallel, the 34th resistance and the second diode Parallel connection, the 35th resistance and third diodes in parallel, the 36th resistance and the 4th diodes in parallel, described the 37 resistance and the 5th diodes in parallel, the 38th resistance and the 6th diodes in parallel, the 39th resistance With the 7th diodes in parallel, the 40th resistance and the 8th diodes in parallel；The second end and the 40th of first inductance The first end of three resistance connects, and the first end of the 43rd resistance is the first sampled output of the output circuit unit, the The second end of 43 resistance is the second sampled output of the output circuit unit, and the second end of the 43rd resistance is through the Two inductance are connect with the anode of the 9th diode, and the cathode of the 9th diode is the voltage output end of the output circuit unit；

The anode of 4th electrolytic capacitor is connect with the second end of the first inductance, the cathode of the 4th electrolytic capacitor and the 5th electrolysis The anode connection of capacitance, the first end of the 41st resistance are connect with the second end of the first inductance, and the second of the 41st resistance End is connect with the first end of the cathode of the 4th electrolytic capacitor and the 42nd resistance respectively, the cathode and the 4th of the 5th electrolytic capacitor The second end of 12 resistance is grounded；The first end of 44th resistance, the anode and the 45th resistance of the 6th electrolytic capacitor First end connect with the anode of the 9th diode, the anode of the second end of the 44th resistance and light emitting diode connects, The minus earth of light emitting diode；The cathode of 6th electrolytic capacitor is connect with the anode of the 7th electrolytic capacitor, the 45th resistance Second end connect respectively with the first end of the cathode of the 6th electrolytic capacitor and the 46th resistance, the cathode of the 7th electrolytic capacitor And the 46th second end of resistance be grounded.

7. remote power feeding central office terminal as claimed in claim 6 circuit, which is characterized in that the current foldback circuit unit includes 47th resistance, the 48th resistance, the 49th resistance, the 50th resistance, the 51st resistance, the 7th capacitance, optocoupler And the 6th NPN triode；Wherein：

First sampling of the anode of light emitting diode through the 47th resistance and the output circuit unit exports in the optocoupler End connects, and the cathode of light emitting diode is connect with the second sampled output of the output circuit unit in the optocoupler, described 7th capacitance connection is in the optocoupler in the anode and optocoupler of light emitting diode between the cathode of light emitting diode, the optocoupler The collector of middle triode is connect through the 48th resistance with the first end of the 49th resistance, the second end of the 49th resistance It is connect with the operating voltage input terminal, the collector of triode is also through the 50th resistance and tri- poles the 6th NPN in the optocoupler The base stage of pipe connects, and the collector of the 6th NPN triode is connect through the 51st resistance with the operating voltage input terminal, The emitter of 6th NPN triode is grounded, the guarantor of the extremely described current foldback circuit unit of current collection of the 6th NPN triode Signal output end is protected, the collector of the 6th NPN triode is connect with the control signal of the control circuit unit.

8. the remote power feeding central office terminal circuit as described in any one of claim 2 to 7, which is characterized in that the first MOS Pipe, the second metal-oxide-semiconductor, third metal-oxide-semiconductor and the 4th metal-oxide-semiconductor are NMOS tube.

9. a kind of remote power feeding central office terminal, which is characterized in that the remote power feeding central office terminal includes any in claim 1 to 8 Remote power feeding central office terminal circuit described in.