CN105226732B - The draw-out power supply circuit of cable temperature monitoring device - Google Patents
The draw-out power supply circuit of cable temperature monitoring device Download PDFInfo
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- CN105226732B CN105226732B CN201510788088.2A CN201510788088A CN105226732B CN 105226732 B CN105226732 B CN 105226732B CN 201510788088 A CN201510788088 A CN 201510788088A CN 105226732 B CN105226732 B CN 105226732B
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Abstract
The invention discloses a kind of draw-out power supply circuits of cable temperature monitoring device, including the taking energy coil being sheathed on cable, the current rectifying and wave filtering circuit being connect with the secondary side winding of the taking energy coil, the Voltage stabilizing module being connect with the current rectifying and wave filtering circuit and the super capacitor being connect with the Voltage stabilizing module, the Voltage stabilizing module exports DC power supply.Above-mentioned draw-out power supply circuit, solving the problems, such as that current transformer takes can there are have " take can dead zone " during low current, i.e. primary side current is smaller, output voltage is low and fails to meet power reguirements, it proposes using stand-by power supply of the super capacitor energy-storage as monitoring system, in case the insufficient occasion of electricity is taken to use in sensing；Solving the problems, such as that current transformer takes can there are saturations during high current, i.e. primary side current is larger, output voltage is high, proposes to ensure the stabilization of 5V output voltages using width input DC DC regulator circuits, DC DC voltage reduction modules have efficient, small advantage relative to linear voltage stabilization.
Description
Technical field
This hair is related to alternating current net side cable temperature monitoring field, and more particularly to a kind of cable temperature monitoring device takes energy
Power circuit.
Background technology
The on-line temperature monitoring of cable is particularly significant for system operation, but since its node is more, distribution is wide, environmental condition
Badly and the reasons such as monitoring device is difficult to install so that monitoring device cannot be preferably applicable in using battery powered mode.Cause
This, there is an urgent need to a kind of reliable and stable, easy for installation and non-maintaining power supply solutions.It is existing to be suitable for power transmission line
The monitoring device method of supplying power on road such as solar energy, capacitance partial pressure are difficult to be transplanted in cable monitoring system power supply again.Other are new
Clever power supply mode such as laser, microwave and ultrasound, but face that cost is high, transfer efficiency is low or electromagnetic interference problem.
In view of cable is generally laid in underground, has thicker dielectric protection layer, it is impossible to using solar energy and capacitance partial pressure
Mode.But when cable work is under single-phase mode, the alternating current on inner wire will excite stronger in Exterior cable space
Quasi-static magnetic field, thus can be based on electromagnetic induction principle, using Exterior cable place it is coil-induced go out voltage and take can, class
Current transformer principle, and referred to as current transformer pattern are similar to, to improve induced voltage, coil is excellent usually with cored
Point be simple in structure, but there is also low current have the easy saturation in dead zone, high current, overcurrent then induced overvoltage the problems such as.Although
In this way, being equivalent to other energy-provision way, current transformer takes energy mode more feasible.
But current transformer take can technically there are certain difficulty, main cause be primary side current variation model
Enclose larger, the voltage after rectifying and wave-filtering will appear large-scale fluctuation, and the voltage stabilizing link design comparison of rear class is difficult.Although using
The method that current transformer opens air gap can effectively prevent magnetic core saturation, reduce core loss, but input side curent change range
It is restricted, is usually applicable only to the occasion that curent change ratio is less than 20 (maximum value is than the ratios of minimum value), energy electric current is taken to deposit
In work " dead zone ", while the voltage change range after rectification is larger, using upper existing defects.
If the energy that takes under primary side current work wide variation can be realized, current transformer takes energy technology that will obtain
To wider application.Therefore, it is necessary to solve as early as possible curent change existing for current transformer is not wide, take can inefficiency, can
By property it is not high the problems such as.
Invention content
In view of the above shortcomings of the prior art, the technical problems to be solved by the invention are：Providing one kind can realize
Under primary side current work wide variation take can, raising take can efficiency, current transformer is overcome to take can there are during low current
The draw-out power supply circuit of the insufficient cable temperature monitoring device of the easy saturation of mutual inductor when having " taking energy dead zone ", high current.
In order to solve the above technical problems, one aspect of the present invention is：A kind of cable temperature monitoring dress is provided
The draw-out power supply circuit put, including be sheathed on cable taking energy coil, connect with the secondary side winding of the taking energy coil
Current rectifying and wave filtering circuit, the Voltage stabilizing module being connect with the current rectifying and wave filtering circuit and the super electricity being connect with the Voltage stabilizing module
Hold, the Voltage stabilizing module exports DC power supply.
Further, the DC-DC voltage reduction modules that the Voltage stabilizing module is exported using wide input ,+5V.
Further, the surge protection electricity being connected between the taking energy coil and the current rectifying and wave filtering circuit is further included
Road.
Further, the overvoltage crowbar being connected between current rectifying and wave filtering circuit and Voltage stabilizing module is further included.
Further, the impact protection circuit includes the first two-way Transient Suppression Diode and the second two-way transient state suppression
Diode processed, the first end of first and second two-way Transient Suppression Diode and the first of the secondary side winding of the taking energy coil
End connection, the second end of the second end of first and second two-way Transient Suppression Diode and the secondary side winding of the taking energy coil
Connection, the both ends of first and second two-way Transient Suppression Diode are also directly connect with the input terminal of current rectifying and wave filtering circuit.
Further, the current rectifying and wave filtering circuit include rectifier bridge and filter capacitor C1, wherein the one of the rectifier bridge
First end of a input terminal with first and second two-way Transient Suppression Diode is connect, another input terminal of the rectifier bridge
It is connect with the second end of first and second two-way Transient Suppression Diode；The one of output terminal and filtered electrical of the rectifier bridge
Hold the anode connection of C1, another output terminal of the rectifier bridge is connect with the negative terminal of filter capacitor C1, the filter capacitor C1
Negativing ending grounding.
Further, the overvoltage crowbar include unidirectional Transient Suppression Diode D3, resistance R1, resistance R2 and
Metal-oxide-semiconductor Q1, the cathode of the unidirectional Transient Suppression Diode D3 are connect with the anode of capacitance C1, and anode is connect by the resistance R1
Ground, the node between the unidirectional Transient Suppression Diode D3 and resistance R1 are connect with the grid of the metal-oxide-semiconductor, the metal-oxide-semiconductor
The drain electrode of Q1 is connect by the resistance R2 with the cathode of the unidirectional Transient Suppression Diode D3, the source electrode of the metal-oxide-semiconductor Q1
It is connect with the DC-DC voltage reduction modules, the drain electrode of the metal-oxide-semiconductor Q1 also passes through the resistance R2 and the DC-DC voltage reduction modules
Connection.
Further, the DC-DC voltage reduction modules include decompression chip U1, several resistance, several capacitances, diode D4,
Inductance L1, the VCC pin of the decompression chip U1 are connect by interface J3 with metal-oxide-semiconductor Q1, and the TCAP of the decompression chip U1 draws
Foot is grounded by capacitance C2, and DRC pins, IS pins, the SWC pins of the decompression chip U1 pass sequentially through resistance R3, capacitance
C3 is grounded, and is also connected with interface J3, and the SWE pins of the decompression chip U1 are connected with the cathode of the diode D4, and described two
The plus earth of pole pipe D4, the SWE pins of the decompression chip U1 also pass sequentially through inductance L1, resistance R4, resistance R5 ground connection, institute
The node for stating inductance L1 and resistance R4 is also grounded by capacitance C4, is also connected with the first pin of output interface J4, the output
The second pin ground connection of interface, the CII pins of the decompression chip U1 are connected with the node between resistance R4 and resistance R5, described
It is depressured the GND pin ground connection of chip U1.
Further, the taking energy coil band is cored.
Further, the taking energy coil is current transformer.
The draw-out power supply circuit of the cable temperature monitoring device of the present invention, has the advantages that：1. solves electric current
Mutual inductor, which takes, can have there be " taking energy dead zone " during low current, i.e., primary side current is smaller, and output voltage is low and fails full
Sufficient power reguirements are proposed using stand-by power supply of the super capacitor energy-storage as monitoring system, in case taking the insufficient field of electricity in sensing
It closes and uses；2. solving the problems, such as that current transformer takes can be there are saturation during high current, i.e. primary side current is larger, output voltage
Height, proposition ensure the stabilization of 5V output voltages using width input DC-DC regulator circuits, and DC-DC voltage reduction modules are relative to linear
Voltage stabilizing has efficient, small advantage.Even if when input and output voltage drop is very big, efficiency will not reduce, and power supply
Big radiator is not needed to；3. fault-resistant ability is strong.Overcurrent caused by for primary side generation short trouble, secondary side will
Impulse overvoltage is induced, thus devises impact protection circuit, to ensure the safety of rear module.4. circuit is simple, volume
It is small, it is light-weight.Using electronic component, convenient for integrating, this can be directly hung on cable for electric installation.5. scalability is strong.
Mutual inductor and super capacitor can be adjusted as needed, to reach higher output voltage and power.6. it is easy for installation, using folding
Formula current transformer can be directly sleeved on existing cable, without disconnecting cable connector installation.
Description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention, for those of ordinary skill in the art, without creative efforts, can be with
Other attached drawings are obtained according to these attached drawings.
Fig. 1 is the block diagram of the draw-out power supply circuit of the cable temperature monitoring device of the present invention.
Fig. 2 is impact protection circuit in Fig. 1, current rectifying and wave filtering circuit and overvoltage crowbar schematic diagram.
Fig. 3 is DC-DC voltage reduction modules schematic diagram in Fig. 1.
Fig. 4 is the source test circuit figure of the draw-out power supply circuit of cable temperature monitoring device of the present invention.
Current transformer output waveform figure when Fig. 5 is primary side input 70A.
Fig. 6 is bridge rectifier output waveform figure.
Fig. 7 is the unloaded output waveform figure of DC-DC voltage reduction modules.
Fig. 8 is draw-out power supply output voltage and the graph of relation of load.
Specific embodiment
Below in conjunction with the attached drawing in the embodiment of the present invention, the technical solution in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other without making creative work
Embodiment shall fall within the protection scope of the present invention.
Refer to Fig. 1 to Fig. 3, the draw-out power supply circuit of the cable temperature monitoring device of the present embodiment, including being sheathed on electricity
Taking energy coil 201 on cable 100, the impact protection circuit 202 being connected with the taking energy coil 201, with surge protection electricity
The connected current rectifying and wave filtering circuit 203 in road 202, the overvoltage crowbar 204 being connected with the current rectifying and wave filtering circuit 203, with it is described
The connected Voltage stabilizing module 205 of overvoltage crowbar 204, the super capacitor 206 being connected with the Voltage stabilizing module 205, the voltage stabilizing
Module 205 exports DC power supply.Cable 100 passes through taking energy coil 201, and 201 both ends of taking energy coil will induce electromotive force, passes through
Impact protection circuit 202, current rectifying and wave filtering circuit 203 export DC voltage, using overvoltage crowbar 204, finally use again
Simultaneously combining super capacitor 206 obtains 5V voltage outputs to Voltage stabilizing module 205.Wherein：
The impact protection circuit 202 includes the first two-way two-way transient states of Transient Suppression Diode D1 and second and inhibits two
Pole pipe D2, the secondary side winding of the first end of first and second two-way Transient Suppression Diode D1, D2 and the taking energy coil 201
First end connection, the second end of first and second two-way Transient Suppression Diode D1, D2 is secondary with the taking energy coil 201
The second end connection of side winding, the both ends of described first and second two-way Transient Suppression Diode D1, D2 are also directly filtered with rectification
The input terminal connection of wave circuit 203.In the present embodiment, the both ends of described first and second two-way Transient Suppression Diode D1, D2
It is connect respectively with the both ends of taking energy coil 201 by interface J1.In the present embodiment, the impact protection circuit 202 further includes certainly
Restore fuse F1, the second end of described first and second two-way Transient Suppression Diode D1, D2 are insured by the self- recoverage
Silk F1 is connect with the second end of the secondary side winding of taking energy coil 201.Self- recoverage insurance F1 plays dash current protective effect, works as hair
Raw short trouble and during excessive electric current, insurance F1 fusing.Two-way Transient Suppression Diode D1, D2 play surge voltage protective effect,
D1, D2 do not work under normal condition, when secondary side winding is induced compared with HI high impact voltage, two-way Transient Suppression Diode D1,
D2 reverse breakdowns, both end voltage clamper it is certain numerically, subsequent conditioning circuit is protected not damaged by moment impact voltage.
The current rectifying and wave filtering circuit 203 includes rectifier bridge and filter capacitor C1, one of input of the rectifier bridge
The first end with first and second two-way Transient Suppression Diode D1, D2 is held to connect, another input terminal of the rectifier bridge
It is connect with the second end of first and second two-way Transient Suppression Diode D1, D2；One of output terminal of the rectifier bridge with
The anode connection of filter capacitor C1, another output terminal of the rectifier bridge are connect with the negative terminal of filter capacitor C1, the filtering
The negativing ending grounding of capacitance C1.Rectification circuit selects diode bridge rectifier circuit.C1 is filter capacitor, considers secondary side induced electricity
Larger distortion may occur due to magnetic core saturation in corrugating, and C1 is taken as 3300 μ F bulky capacitors with smooth waveform ripple.
The overvoltage crowbar 204 includes unidirectional Transient Suppression Diode D3, resistance R1, resistance R2 and metal-oxide-semiconductor Q1,
The cathode of the unidirectional Transient Suppression Diode D3 is connect with the anode of capacitance C1, and anode is grounded by the resistance R1, described
Unidirectionally the node between Transient Suppression Diode D3 and resistance R1 is connect with the grid of the metal-oxide-semiconductor, the drain electrode of the metal-oxide-semiconductor Q1
It is connect by the resistance R2 with the cathode of the unidirectional Transient Suppression Diode D3, source electrode and the DC- of the metal-oxide-semiconductor Q1
DC voltage reduction modules connect, and the drain electrode of the metal-oxide-semiconductor Q1 is also connect by the resistance R2 with the DC-DC voltage reduction modules.Transient state
Diode D3, resistance R1, R2 and metal-oxide-semiconductor Q1 is inhibited to collectively form overvoltage crowbar 204.Mould is depressured in view of follow-up DC-DC
The block input voltage range upper limit is 40V, and therefore, when input voltage is more than 40V, unidirectional Transient Suppression Diode D3 is reversely hit
It wears, there is electric current to flow through generation pressure drop on R1, Q1 conductings, resistance R2 forms discharge loop, so as to fulfill over-voltage protecting function.
Regulator circuit uses DC-DC voltage reduction modules, has efficient, small advantage relative to linear voltage stabilization.Even if
When input and output voltage drop is very big, efficiency will not reduce, and power supply does not need to big radiator.This paper selected modules it is defeated
Enter ranging from 7 ~ 40V, export as 5V, the output of the Voltage stabilizing module 205 is also coupled to super capacitor 206.Using super capacitor 206
Stand-by power supply of the energy storage as monitoring system, solving current transformer low current, there are dead-time problems.
The Voltage stabilizing module 205 is using the DC-DC voltage reduction modules of wide input ,+5V outputs, the DC-DC voltage reduction modules packet
Decompression chip U1, several resistance, several capacitances, diode D4, inductance L1 are included, the VCC pin of the decompression chip U1 is by connecing
Mouth J3 is connect with metal-oxide-semiconductor Q1, and the TCAP pins of the decompression chip U1 are grounded by capacitance C2, the DRC of the decompression chip U1
Pin, IS pins, SWC pins pass sequentially through resistance R3, capacitance C3 ground connection, also connect with interface J3, the decompression chip U1
SWE pins be connected with the cathode of the diode D4, the plus earth of the diode D4, the SWE of the decompression chip U1
Pin also passes sequentially through inductance L1, resistance R4, resistance R5 ground connection, and the node of the inductance L1 and resistance R4 is also connect by capacitance C4
Ground is also connected with the first pin of output interface J4, the second pin ground connection of the output interface, the decompression chip U1's
Node between CII pins and resistance R4 and resistance R5 is connected, the GND pin ground connection of the decompression chip U1.Select MC34063
Chip makees buck converter, it contains the control circuit of DC/DC converters, and main composition part is the electricity for having temperature-compensating
The controllable oscillator of potential source, duty ratio, driver, comparator, High-current output switching circuit and R-S triggers.MC34063 leads to
Outer connecting resistance R1, R2 are crossed to monitor output voltage, chip interior reference voltage is 1.25V, when output voltage is less than reference voltage
When, chip interior comparator output leaping voltage, internal trigger S feet are high level；When oscillator is to capacitor charging, R feet
For high level so that trigger Q ends are high level, so as to which output switching tube is connected, and then have input voltage VIN to be filtered to output
Wave device capacitance C2 chargings have the function that automatically control VO stabilizations to improve output voltage VO.
In the present embodiment, the taking energy coil 201 is with cored.Current Transformer can actually be reinstated.The present invention uses
Open-close type current transformer can be directly sleeved on existing cable 100, without disconnecting the installation of 100 connector of cable.
The draw-out power supply circuit of the cable temperature monitoring device of the present invention, cable 100 pass through taking energy coil 201, take energy line
Electromotive force will be induced by enclosing 201 both ends, be exported DC voltage by impact protection circuit 202, current rectifying and wave filtering circuit 203, then passed through
Overvoltage crowbar 204 is crossed, 5V voltage outputs are finally obtained using DC-DC Voltage stabilizing modules 205 and combining super capacitor 206 again.
The present invention is all using analog component, and circuit is simple, at low cost, strong antijamming capability.Using open-close type current transformer just
In installation.The remarkable result of the present invention is that solve current transformer to take deficiency existing for energy, realizes that primary side current work is big
Energy is taken under range, raising takes can efficiency.Using super capacitor 206 as stand-by power supply, overcome current transformer and take
There can be " taking energy dead zone " in low current, mutual inductor easy saturation when overcoming high current using width input DC-DC regulator circuits
Deficiency, design surge protection and overvoltage crowbar 204 to ensure the safety of rear module in primary side failure, stablize
Reliably power for on-line monitoring equipment.
The draw-out power supply circuit of the cable temperature monitoring device of the present invention, has the advantages that：1. solves electric current
Mutual inductor, which takes, can have there be " taking energy dead zone " during low current, i.e., primary side current is smaller, and output voltage is low and fails full
Sufficient power reguirements are proposed using stand-by power supply of 206 energy storage of super capacitor as monitoring system, in case taking electricity insufficient in sensing
Occasion uses；2. solving the problems, such as that current transformer takes can be there are saturation during high current, i.e. primary side current is larger, output electricity
Pressure is high, proposes to ensure the stabilization of 5V output voltages using width input DC-DC regulator circuits, DC-DC voltage reduction modules are relative to line
Property voltage stabilizing have efficient, small advantage.Even if when input and output voltage drop is very big, efficiency will not reduce, Er Qie electricity
Source does not need to big radiator；3. fault-resistant ability is strong.Overcurrent caused by for primary side generation short trouble, secondary side
Impulse overvoltage will be induced, thus devises impact protection circuit 202, to ensure the safety of rear module.4. circuit is simple,
It is small, it is light-weight.Using electronic component, convenient for integrating, this can be directly hung over for electric installation on cable 100.5. it can expand
Malleability is strong.Mutual inductor and super capacitor 206 can be adjusted as needed, to reach higher output voltage and power.6. installation side
Just, it using open-close type current transformer, can be directly sleeved on existing cable 100, without disconnecting the installation of 100 connector of cable.
Fig. 4 to Fig. 8 is referred to, the draw-out power supply circuit of above-mentioned cable temperature monitoring device is tested in this part, surveys
Examination equipment mainly has：Strong current generator SLQ-500A, oscillograph UTD1025C, punching open-close type current transformer
KHCT911L-600A/5A and DC-DC voltage reduction modules and 0.33F, 5.5V super capacitor 206.To reduce current in wire, once
Side mutual inductor punching conducting wire 101 is taken as 10 circles, and input total current is 70A, DC-DC voltage reduction module output no-loads.
Current transformer works fine is understood by above-mentioned a few width figures, and the enough subsequent conditioning circuits of induced voltage of generation use.Through
+ the 5V that circuit output is stablized after DC-DC voltage stabilizings or so voltage meets the power reguirements of 5V electricity systems, and can be to super capacitor
206 charge.
Table 1 is in the case of with load, and control primary side input total current is 70A, is measured under different loads resistance R
Output voltage virtual value U and output power P.
| U（V） | P（mW） | R（） |
| 4.6 | 450.2 | 47 |
| 4.8 | 307.2 | 75 |
| 5.0 | 250.0 | 100 |
| 5.6 | 156.8 | 200 |
| 5.8 | 122.3 | 275 |
| 5.8 | 71.5 | 470 |
| 5.8 | 42.0 | 800 |
| 5.8 | 33.6 | 1000 |
Table 1
From the above：For the ac cable 100 of single-phase operation, available current mutual inductor mode is outside cable 100
Take energy.To improve coil-induced voltage, the coil containing iron core can be used, while in view of the convenience of installation, the present invention proposes to adopt
With punching open-close type current transformer.Regulator circuit uses DC-DC voltage reduction modules, opposite linear voltage stabilizing, even if in input and output
When voltage drop is very big, high efficiency is still kept；And power supply does not need to big radiator, has small advantage.Draw-out power supply
Experiments have shown that：Herein design and realize draw-out power supply can reliably working, have certain load capacity, cable can be solved
The powerup issue of temperature monitoring device.
It these are only embodiments of the present invention, be not intended to limit the scope of the invention, it is every to utilize the present invention
The equivalent structure or equivalent flow shift that specification and accompanying drawing content are made directly or indirectly is used in other relevant technologies
Field is included within the scope of the present invention.
Claims (3)
1. a kind of draw-out power supply circuit of cable temperature monitoring device, including be sheathed on cable taking energy coil, take with described
Can the current rectifying and wave filtering circuit of secondary side winding connection of coil, the Voltage stabilizing module that is connect with the current rectifying and wave filtering circuit and with institute
The super capacitor of Voltage stabilizing module connection is stated, the Voltage stabilizing module exports DC power supply；
The Voltage stabilizing module uses DC-DC voltage reduction module of the input range for wide the input ,+5V outputs of 7-40V；
Further include the impact protection circuit being connected between the taking energy coil and the current rectifying and wave filtering circuit；
Further include the overvoltage crowbar being connected between current rectifying and wave filtering circuit and Voltage stabilizing module；
The impact protection circuit include the first two-way Transient Suppression Diode and the second two-way Transient Suppression Diode, first
And second the first end of two-way Transient Suppression Diode connect with the first end of the secondary side winding of the taking energy coil, first and
The second end of second two-way Transient Suppression Diode is connect with the second end of the secondary side winding of the taking energy coil, and described first
And second the both ends of two-way Transient Suppression Diode also directly connect with the input terminal of current rectifying and wave filtering circuit；
The current rectifying and wave filtering circuit includes rectifier bridge and filter capacitor C1, and one of input terminal of the rectifier bridge is with the
One and second two-way Transient Suppression Diode first end connection, another input terminal of the rectifier bridge is double with first and second
It is connected to the second end of Transient Suppression Diode；One of output terminal of the rectifier bridge connects with the anode of filter capacitor C1
It connects, another output terminal of the rectifier bridge is connect with the negative terminal of filter capacitor C1, the negativing ending grounding of the filter capacitor C1；
The overvoltage crowbar includes unidirectional Transient Suppression Diode D3, resistance R1, resistance R2 and metal-oxide-semiconductor Q1, the list
It is connect to the cathode of Transient Suppression Diode D3 with the anode of capacitance C1, anode is grounded by the resistance R1, the unidirectional wink
State inhibits the node between diode D3 and resistance R1 to be connect with the grid of the metal-oxide-semiconductor, and the drain electrode of the metal-oxide-semiconductor Q1 passes through institute
The cathode that resistance R2 is stated with the unidirectional Transient Suppression Diode D3 is connect, and source electrode and the DC-DC of the metal-oxide-semiconductor Q1 are depressured
One end connection of module, the drain electrode of the metal-oxide-semiconductor Q1 are also connected by the other end of the resistance R2 and the DC-DC voltage reduction modules
It connects；When input voltage is more than 40V, unidirectional Transient Suppression Diode D3 reverse breakdowns have electric current to flow through generation pressure drop, Q1 on R1
Conducting, resistance R2 forms discharge loop, so as to fulfill over-voltage protecting function；
The DC-DC voltage reduction modules include decompression chip U1, resistance R3, resistance R4, resistance R5, capacitance C2, capacitance C3, capacitance
C4, diode D4, inductance L1, the VCC pin of the decompression chip U1 passes through the second pin of interface J3 and unidirectional transient state inhibits
The cathode connection of diode D3, the TCAP pins of the decompression chip U1 are grounded by capacitance C2, the DRC of the decompression chip U1
Pin, IS pins, SWC pins pass sequentially through resistance R3, capacitance C3 ground connection, also connect with the first pin of interface J3, described
The SWE pins of decompression chip U1 are connected with the cathode of the diode D4, the plus earth of the diode D4, the decompression core
The SWE pins of piece U1 also pass sequentially through inductance L1, resistance R4, resistance R5 ground connection, the node between the inductance L1 and resistance R4
It is also grounded by capacitance C4, is also connected with the first pin of output interface J4, the second pin ground connection of the output interface is described
The CII pins of decompression chip U1 are connected with the node between resistance R4 and resistance R5, and the GND pin of the decompression chip U1 connects
Ground；
It is depressured chip U1 and selects MC34063 chips, MC34063 chips have the voltage source of temperature-compensating, duty ratio are controllable to shake
Swing device, driver, comparator, High-current output switching circuit and R-S triggers；MC34063 chips by outer connecting resistance R4 and
R5 monitors output voltage；The reference voltage of MC34063 chip interiors is 1.25V, when the output voltage of DC-DC voltage reduction modules is low
When reference voltage, the comparator output leaping voltage of MC34063 chip interiors, the R-S triggers of MC34063 chip interiors
S feet are high level；When the oscillator of MC34063 chip interiors charges to super capacitor C4, the R-S of MC34063 chip interiors
The R feet of trigger are high level so that the Q ends of R-S triggers are high level, so as to which output switching tube is connected, and then are had defeated
Enter voltage VIN to charge to improve output voltage VO to output filter capacitance C2, have the function that automatically control VO stabilizations.
2. the draw-out power supply circuit of cable temperature monitoring device as described in claim 1, it is characterised in that：The taking energy coil
With cored.
3. the draw-out power supply circuit of cable temperature monitoring device as claimed in claim 2, it is characterised in that：The taking energy coil
For current transformer.
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| CN201510788088.2A CN105226732B (en) | 2015-11-16 | 2015-11-16 | The draw-out power supply circuit of cable temperature monitoring device |
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| CN201510788088.2A CN105226732B (en) | 2015-11-16 | 2015-11-16 | The draw-out power supply circuit of cable temperature monitoring device |
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| CN106487101A (en) * | 2016-09-13 | 2017-03-08 | 中国农业大学 | A kind of current transformer energy taking device based on load control and method |
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| CN106410981A (en) * | 2016-12-08 | 2017-02-15 | 天津市百利纽泰克电气科技有限公司 | Busbar electricity getting circuit of high-voltage side of current transformer |
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| CN118100460B (en) * | 2024-04-24 | 2024-07-12 | 电子科技大学中山学院 | CT energy-taking device suitable for low-power consumption cable circulation current monitoring system |
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| CN202634061U (en) * | 2012-04-20 | 2012-12-26 | 东北电力大学 | High-voltage switch monitoring system power supply for transformer station |
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| CN103121409B (en) * | 2011-11-18 | 2015-04-22 | 北汽福田汽车股份有限公司 | Automobile braking circuit protecting device and automobile braking device provided with the same |
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| CN202634061U (en) * | 2012-04-20 | 2012-12-26 | 东北电力大学 | High-voltage switch monitoring system power supply for transformer station |
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