CN205992856U - Switching power supply and ammeter - Google Patents

Abstract

A kind of Switching Power Supply and ammeter, wherein, Switching Power Supply includes：First transformator and the second transformator；External power source is coupled with the primary coil of the first transformator, and the secondary coil of the first transformator is coupled with the primary coil of the second transformator, and the secondary coil of the second transformator is coupled with load.It is first voltage signal by the input voltage regulation of external power source that first transformator is used for by the primary coil of the first transformator and the galvanomagnetic-effect of secondary coil, and the primary coil by first voltage signal input second transformator, so that external power source and the second transformator electrical isolation；It is second voltage signal by first voltage Signal Regulation that second transformator is used for by the primary coil of the second transformator and the galvanomagnetic-effect of secondary coil, and by second voltage signal output to load, so that the first transformator is isolated with load electrical.Realize the electrical isolation of 10KV between external input power and load by the first transformator and the second transformer series.

Description

Switching Power Supply and ammeter

Technical field

This utility model is related to technical field of electricity, in particular to a kind of Switching Power Supply and ammeter.

Background technology

With scientific and technical development and raising, ammeter has been carried out intellectuality.Intelligent electric meter still needs to personnel to be carried out necessarily Operation and maintenance, wherein, the RS-485 interface using electric energy meter is a basic function to its data reading system.In prior art Intelligent electric meter in, between RS-485 interface and electrical network maximum can bear required by national grid 6KV pulse voltage isolation. But the surge with social development and power consumption, power system is also more next for the requirement of intelligent electric meter safety and reliability Higher.Therefore, the 6KV pulse voltage isolation that can bear in prior art gradually can not meet safety and reliability Requirement, thus when personnel carry out operation and maintenance by RS-485 interface to intelligent electric meter, there is safety in existing intelligent electric meter Hidden danger.And in prior art, can pass through to increase transformer size or increase insulant between Transformer Winding to improve intelligence The insulating properties of energy ammeter.Increasing transformator, to cause intelligent electric meter oversized, is not convenient to use；And increase insulant and cause The production cost of intelligent electric meter is too high.Therefore, how effectively improving intelligent electric meter and bearing higher pulse voltage isolation is Industry a great problem at present.

Utility model content

The purpose of this utility model is to provide a kind of Switching Power Supply and ammeter, and it can make ammeter bear higher pulse Voltage.

In a first aspect, this utility model embodiment provides a kind of Switching Power Supply, including：First transformator and the second transformation Device；External power source is coupled with the primary coil of described first transformator, the secondary coil of described first transformator and described second The primary coil coupling of transformator, the secondary coil of described second transformator is coupled with load.Described first transformator is used for leading to Cross the galvanomagnetic-effect of the primary coil of described first transformator and the secondary coil of described first transformator by described external power source Input voltage regulation be first voltage signal, and the former limit line by the second transformator described in described first voltage signal input Circle, so that described external power source and described second transformator electrical isolation.Described second transformator is used for becoming by described second Described first voltage Signal Regulation is the by the galvanomagnetic-effect of the secondary coil of the primary coil of depressor and described second transformator Two voltage signals, and by described second voltage signal output to described load, so that described first transformator and described load electricity Air bound from.

Further, also include：Pulse control circuit and switch module, described switch module includes：First contact, second Contact and control end, the outfan of described pulse control circuit is coupled with described control end, described first contact and described first The primary coil coupling of transformator, described second contact is coupled with reference voltage end.

Further, the described primary coil of described first transformator includes：First primary coil and the second primary coil, One end of described first primary coil is coupled with described external power source, and the other end of described first primary coil touches with described first Point coupling, one end of described second primary coil and described second coupling contact points, the other end of described second primary coil and institute State the power end coupling of pulse control circuit.

Further, described switch module includes field effect transistor, and the grid of described field effect transistor is described control end, described The drain electrode of field effect transistor is described first contact, and the source electrode of described field effect transistor is described second contact.

Second aspect, this utility model embodiment additionally provides a kind of ammeter, including：Metering module, communication module, control Module and Switching Power Supply, the input of the input of described metering module and described control module all with described first transformator Secondary coil coupling；The secondary coil of described second transformator is coupled with described communication module, described communication module with described Control module couples.

Further, the secondary coil of described first transformator includes：First secondary coil and the second secondary coil, described First secondary coil and described second secondary coil are all coupled with the described primary coil of described first transformator, described metering mould The input of block is coupled with described first secondary coil, and the input of described control module is coupled with described second secondary coil, Described second secondary coil is coupled with the primary coil of described second transformator.

Further, described communication module and described control module pass through the first photoelectrical coupler and the second photoelectrical coupler Coupling, described first photoelectrical coupler includes：First light emitting diode and the first phototriode；Described first light emitting diode Two ends all couple with the outfan of described control module, the collector terminal of described first phototriode and emitter terminal all with The input coupling of described communication module；Described second photoelectrical coupler includes：Second light emitting diode and the second photosensitive three poles Pipe；The two ends of described second light emitting diode are all coupled with the outfan of described communication module, described second phototriode Collector terminal and emitter terminal are all coupled with the input of described control module.

Further, also include：The input coupling of testing circuit, the input of described testing circuit and described control module Close, the outfan of described testing circuit is coupled with the input of described pulse control circuit.

Further, described testing circuit is provided with the 5th photoelectrical coupler, and described 5th photoelectrical coupler includes：5th Optical diode and the 5th phototriode；The outfan coupling all with described testing circuit for the two ends of described 5th light emitting diode Close, the collector and emitter of described 5th phototriode is all coupled with the input of described pulse control circuit.

Further, also include：Rectification module and Voltage stabilizing module, the input of described rectification module and described second transformation The secondary coil coupling of device, the outfan of described rectification module is coupled with the input of described Voltage stabilizing module, described Voltage stabilizing module Outfan couple with described communication module.

The beneficial effect of this utility model embodiment is：Coupled with the primary coil of the first transformator by external power source, The secondary coil of the first transformator is coupled with the primary coil of the second transformator, the secondary coil of the second transformator with load coupling Close.

Due to the first transformator and the second transformer series, the voltage of input just can be assigned to the first transformator and Two transformators.The insulant that the secondary coil of the primary coil of the first transformator and the first transformator is provided with ensure that first Dielectric strength between the secondary coil of the primary coil of transformator and the first transformator reaches 6KV, that is, be capable of the electricity of 6KV Air bound from.And the insulant that the secondary coil of the primary coil of the second transformator and the second transformator is provided with ensure that second Dielectric strength between the secondary coil of the primary coil of transformator and the second transformator also can reach 6KV, that is, also can be real The electrical isolation of existing 6KV.After first transformator and the second transformer series, the voltage of external power source input just can be assigned to First transformator and the second transformator.And then first can bear the electricity within 12KV after transformator and the second transformer series Pressure, and realize electrical isolation.

The cascaded structure of the first transformator and the second transformator is applied in ammeter, and ammeter passes through the first transformator and second The series connection of transformator and realize the electrical isolation of at least 10KV electric pressure between the input power of outside and ammeter, and then significantly The insulation values that improve ammeter, make ammeter bear higher pulse voltage.

Brief description

In order to be illustrated more clearly that the technical scheme of this utility model embodiment, below will be to use required in embodiment Accompanying drawing be briefly described it will be appreciated that the following drawings illustrate only some embodiments of the present utility model, therefore should be by Regard the restriction to scope as, for those of ordinary skill in the art, on the premise of not paying creative work, also may be used To obtain other related accompanying drawings according to these accompanying drawings.

Fig. 1 provides a kind of module map of Switching Power Supply for this utility model embodiment；

Fig. 2 provides a kind of circuit diagram of Switching Power Supply for this utility model embodiment；

Fig. 3 provides a kind of module map of the ammeter being applied to this Switching Power Supply for this utility model embodiment；

Fig. 4 provides a kind of circuit diagram of the ammeter of this Switching Power Supply of application for this utility model embodiment

In figure：Switching Power Supply 100, fairing 110, electromagnetic interference process circuit 111, rectifying and wave-filtering 112, switch module 120th, pulse control circuit 130, ammeter 200, the first rectifying and voltage-stabilizing device 210, metering module 220, the second fairing 230, Control module 240, the 3rd rectifying and voltage-stabilizing device 250, communication module 260, testing circuit 270.

Specific embodiment

Purpose, technical scheme and advantage for making this utility model embodiment are clearer, new below in conjunction with this practicality Accompanying drawing in type embodiment, is clearly and completely described it is clear that being retouched to the technical scheme in this utility model embodiment The embodiment stated is a part of embodiment of this utility model, rather than whole embodiments.Generally described in accompanying drawing herein and The assembly of this utility model embodiment illustrating can be arranged with various different configurations and design.

Therefore, below requirement is not intended to limit to the detailed description of the embodiment of the present utility model providing in the accompanying drawings The scope of the present utility model of protection, but it is merely representative of selected embodiment of the present utility model.Based in this utility model Embodiment, the every other embodiment that those of ordinary skill in the art are obtained under the premise of not making creative work, all Belong to the scope of this utility model protection.

It should be noted that：Similar label and letter represent similar terms in following accompanying drawing, therefore, once a certain Xiang Yi It is defined in individual accompanying drawing, then do not need it to be defined further and explains in subsequent accompanying drawing.Of the present utility model In description, term " first ", " second ", " the 3rd " etc. are only used for distinguishing description, and it is not intended that instruction or hint are relatively heavy The property wanted.

In addition it is also necessary to explanation in description of the present utility model, unless otherwise clearly defined and limited, term " sets Put ", " connection ", " coupling " should be interpreted broadly, for example, it may be being fixedly connected or being detachably connected, or integratedly Connect；Can be to be mechanically connected or electrically connect；Can be to be joined directly together it is also possible to be indirectly connected to by intermediary, It can be the connection of two element internals.For the ordinary skill in the art, above-mentioned art can be understood with concrete condition Concrete meaning in this utility model for the language.

Refer to Fig. 1, Fig. 1 shows Switching Power Supply 100 module map that this utility model embodiment provides.Switching Power Supply 100 include：Fairing 110, the first transformator T1, the second transformator T2, switch module 120 and pulse control circuit 130.

Refer to the circuit diagram of the Switching Power Supply 100 that this utility model embodiment illustrated in fig. 2 provides.Fairing 110 power supplys being used for inputting external power input mouth AA ' carry out eliminating electromagnetic interference and rectification.By fairing 110 The AC rectification that external power source is inputted is direct current, and inputs the primary coil of the first transformator T1.Preferably, fairing 110 include：Electromagnetic interference process circuit 111 and rectifying and wave-filtering 112 circuit.The input of electromagnetic interference process circuit 111 is with outward Portion's power input port AA ' coupling, the input coupling of the outfan of electromagnetic interference process circuit 111 and rectifying and wave-filtering 112 circuit Close.In the ac high voltage source being inputted by port AA ', in ac high voltage source, there is electromagnetic interference, and then equipment is caused Interference.Electromagnetic interference process circuit 111 can be used in the electromagnetic interference filtering of the external power source of input, thus avoiding to setting Standby interference.Meanwhile, the interference signal that Switching Power Supply itself also can be produced by electromagnetic interference process circuit 111 filters, with The interference signal that Switching Power Supply itself produces is prevented to be flowed into electrical network, the operation to the other equipment of electrical network interferes.Optional , this enforcement can pass through filtering and the side of shielding using EMC (Electro Magnetic Compatibility) process circuit The electromagnetic interference that formula is existed with the external power source eliminating input.Rectifying and wave-filtering 112 circuit by with electromagnetic interference process circuit 111 Coupling, rectifying and wave-filtering 112 circuit can receive the signal of telecommunication after electromagnetic interference process circuit 111 is processed.Rectifying and wave-filtering 112 electricity Road is used for for the AC signal of input being converted to, by rectification and filtering, the former limit being output to the first transformator T1 after direct current Coil.

First transformator T1 is used for by the primary coil of described first transformator T1 and the secondary of T1 the first transformator T1 The input voltage regulation of external power source is first voltage signal by the galvanomagnetic-effect of coil.Preferably, the first transformator T1's is former Sideline circle includes：First primary coil aa ', the second primary coil bb '.The secondary coil of the first transformator T1 includes：First is secondary Cc ', the second secondary coil dd ' are enclosed in sideline.It is provided with protection circuit, protection circuit includes between first primary coil aa '：First electricity Hold C1, first resistor R1 and the first diode D1.The input of the first primary coil aa ' and the output of rectifying and wave-filtering 112 circuit End coupling, the input coupling of one end all with the first primary coil aa ' of one end of the first electric capacity C1 and first resistor R1.First The cathode terminal coupling of the other end all with the first diode D1 of the other end of electric capacity C1 and first resistor R1, the first diode D1's Anode tap is coupled with the outfan of the first primary coil aa '.Optionally, the protection circuit of the present embodiment is RCD absorbing circuit.Logical Cross the one-way conduction of the first diode D1, and the energy storage of the first electric capacity C1 is thus form protection to field effect transistor Q1.

Switch module 120 is used for carrying out the connection between the primary coil of break-make first transformator and reference voltage end, with Change the voltage at the primary coil two ends of the first transformator.Preferably, described switch module includes：First contact, the second contact, Described first contact is coupled with the primary coil of described first transformator, and described second contact is coupled with reference voltage end.

In addition, the first contact for the ease of the Signal-controlled switch module by pulse signal etc. with low and high level and The break-make of the second contact and closure, this switch module also includes control end, and this control end is used for the pulse signal of receives input, with Control the first contact and the break-make of the second contact.

Preferably, switch module 120 can be：Field effect transistor Q1.Because switch module 120 includes：First contact, second Contact and control end, thus field effect transistor Q1 grid can be control end, the drain electrode of field effect transistor Q1 can be the first contact, field The source electrode of effect pipe Q1 can be the second contact.

In this utility model embodiment, Switching Power Supply 100 also includes pulse control circuit 130, pulse control circuit 130 For cut-offfing of controlling switch module 120, thus being entered with certain frequency by pulse control circuit 130 controlling switch module 120 Row cut-offs, and the direct current signal that just can export current rectifying and wave filtering circuit 112 changes into pulse signal.First transformator T1 former limit line The pulse signal of circle can make the secondary coil of the first transformator T1 produce the first voltage of same frequency by electromagnetic induction Signal, and first voltage signal is blood pressure lowering pulse voltage.By the first transformator T1 secondary coil respectively with output port BB ' and Output port CC ' couples, so that blood pressure lowering pulse voltage is passed through output port BB ' and defeated by the first transformator T1 secondary coil respectively Exit port CC ' output.

Preferably, pulse control circuit 130 includes：Control chip U1, the second diode D2, second resistance R2, the second electricity Hold C2 and the 3rd electric capacity C3.

The outfan of the first primary coil aa ' is coupled with the drain electrode of field effect transistor Q1.The grid of field effect transistor Q1 and control Output control terminal (PWM-OUT) coupling of chip U1, the source electrode of field effect transistor Q1 is coupled with one end of the second primary coil bb '. Source electrode due to field effect transistor Q1 is also coupled with reference voltage end, thus one end of the second primary coil bb ' can be with reference to electricity Pressure side, that is, one end of the second primary coil bb ' is ground reference point.The other end of the second primary coil bb ' and the two or two pole The anode coupling of pipe D2, the negative electrode of the second diode D2 is coupled with one end of second resistance R2.The other end of second resistance R2 with One end coupling of the second electric capacity C2, the other end of the second electric capacity C2 is coupled with field effect transistor Q1 source electrode.The power supply of control chip U1 Voltage end VDD is coupled with the other end of second resistance R2 to provide the running voltage of control chip U1.The output of control chip U1 Under-voltage protection side BR is coupled with the other end of the second electric capacity C2.The one of the feedback voltage end FB of control chip U1 and the 3rd electric capacity C3 End coupling, the other end of the 3rd electric capacity C3 is coupled with the other end of the second electric capacity C2.

Coupled with the drain electrode of field effect transistor Q1 and the second primary coil by the first primary coil aa ' of the first transformator T1 Bb ' is coupled with the source electrode of field effect transistor Q1, and control chip U1 is by coupling with the grid of field effect transistor Q1, thus control chip U1 can control cut-offfing of field effect transistor Q1.Control chip U1 controls the conducting of field effect transistor Q1 intermittence, thus rectifying and wave-filtering is electric The direct current signal of road 112 output is cut to pulse signal.First primary coil aa ' can make the first former limit by pulse signal Coil aa ' produces alternating magnetic field such that it is able to make the second primary coil bb ' produce frequency and pulse signal identical the 3rd blood pressure lowering Pulse voltage.The 3rd blood pressure lowering pulse voltage signal that second primary coil bb ' exports passes through the second diode D2, second resistance R2 With the first rectification circuit of the second electric capacity C2 composition, the 3rd blood pressure lowering pulse voltage signal rectification is direct current signal.And direct current Signal provides the power supply of control chip U1 by inputting the power voltage terminal VDD of control chip U1.Optionally, in the present embodiment In, the first rectification circuit being made up of the second diode D2, second resistance R2 and the second electric capacity C2 can be half-wave rectifying circuit.

First primary coil aa ' by pulse signal can make first primary coil aa ' produce alternating magnetic field such that it is able to The first secondary coil cc ' and the second secondary coil dd ' is made to produce voltage by electromagnetic induction.Optionally, in the present embodiment, the The voltage signal blood pressure lowering that Switching Power Supply 100 is inputted by one transformator T1.Therefore, the first secondary coil cc ' can produce frequency with Pulse signal identical the first blood pressure lowering pulse voltage, the second secondary coil dd ' also can produce frequency and pulse signal identical Second blood pressure lowering pulse voltage.First blood pressure lowering pulse voltage just can with the first coupling of secondary coil cc ' by output port BB ' Export external loading, and the second blood pressure lowering pulse voltage just also can with the second coupling of secondary coil dd ' by output port CC ' External loading is arrived in enough output.

Second transformator T2 is used for the secondary coil by the primary coil of the second transformator T2 and the second transformator T2 First voltage Signal Regulation is second voltage signal by galvanomagnetic-effect, and by described second voltage signal output to load, so that First transformator T1 is isolated with load electrical.

The primary coil of the second transformator T2 is coupled with the second secondary coil dd ' of the first transformator T1, thus second is secondary The primary coil that the second blood pressure lowering pulse voltage producing can be inputted the second transformator T2 by dd ' is enclosed in sideline.Second transformator T2 Secondary coil produced and the second blood pressure lowering pulse voltage same frequency by the primary coil electromagnetic induction with the second transformator T2 The blood pressure lowering pulse signal of rate.By the second secondary coil of transformator T2 and coupling of output port DD ', just can be by blood pressure lowering arteries and veins Rush signal output to external loading.

Therefore, the Switching Power Supply 100 that the present embodiment provides, during Switching Power Supply 100 work, the first transformator T1 passes through first Galvanomagnetic-effect between the secondary coil of the primary coil of transformator T1 and the first transformator T1, can be by the input of external power source Voltage-regulation is blood pressure lowering pulse voltage, and blood pressure lowering pulse voltage is first voltage signal.Blood pressure lowering pulse voltage includes：First blood pressure lowering Pulse voltage, the second blood pressure lowering pulse voltage and the 3rd pulse step-down voltage.First blood pressure lowering pulse voltage input external loading, second Blood pressure lowering pulse voltage inputs the primary coil of the second transformator T2, and the 3rd step-down voltage provides control chip U1 supply voltage. It is transmitted so as to make external power source and the second transformator T2 and external loading by the galvanomagnetic-effect of the first transformator T1 Realize electrical isolation.Second transformator T2 by the secondary coil of the primary coil of the second transformator T2 and the second transformator T2 it Between galvanomagnetic-effect, can by input the second blood pressure lowering pulse voltage be adjusted to blood pressure lowering pulse signal it is possible to understand that, blood pressure lowering Pulse signal is second voltage signal.Blood pressure lowering pulse signal is input to external loading by the second transformator T2, becomes by second The galvanomagnetic-effect of depressor T2 is transmitted so as to make the first transformator T1 and external loading realize electrical isolation.

During Switching Power Supply 100 work, that is, the first transformator T1 and the second transformator T2 is in electromagnetic transmission.First transformator T1 and the second transformator T2 can bear the voltage of some strength, that is, between the primary coil of the first transformator T1 and secondary coil It is required to bear the voltage of some strength and the primary coil of the second transformator T2 and secondary coil between.First transformator T1's The intensity of voltage is being born and the primary coil of the second transformator T2 and secondary coil between primary coil and secondary coil All there is a maximum voltage bearing value.Former with the second transformator T2 between the primary coil of the first transformator T1 and secondary coil When the voltage being born between sideline circle and secondary coil is within maximum voltage bearing value, the primary coil of the first transformator T1 All can be transmitted with galvanomagnetic-effect, that is, and the primary coil of the second transformator T2 and secondary coil between and secondary coil between Between the primary coil of the first transformator T1 and secondary coil and the primary coil of the second transformator T2 and secondary coil between all No it is electrically connected with, thus realizing electrical isolation.But with the second change between the primary coil as the first transformator T1 and secondary coil When the voltage being born between the primary coil of depressor T2 and secondary coil is higher than maximum voltage bearing value, the first transformator T1's Carry out galvanomagnetic-effect biography and the primary coil of the second transformator T2 and secondary coil between primary coil and secondary coil Defeated destroyed, i.e. primary coil and secondary with the second transformator T2 between the primary coil of the first transformator T1 and secondary coil All breakdown between coil, thus electrical isolation is destroyed, and it is electrically connected.

In the present embodiment, the insulation material that the secondary coil of the primary coil of the first transformator T1 and the first transformator T1 is provided with Material can not only ensure that the dielectric strength between the primary coil of the first transformator T1 and the secondary coil of the first transformator T1 reaches To 6KV additionally it is possible to ensure that between the secondary coil of the first transformator T1 and secondary coil, dielectric strength reaches 6KV, that is, can be real The electrical isolation of 6KV between the first secondary coil cc ' and the second secondary coil dd ' of existing first transformator T1.Second transformator The insulant that the secondary coil of the primary coil of T2 and the second transformator T2 is provided with ensure that the former limit of the second transformator T2 Dielectric strength between the secondary coil of coil and the second transformator T2 also can reach 6KV, is also capable of the electric of 6KV Isolation.First transformator T1 and the second transformator T2 series connection, the voltage being inputted during Switching Power Supply 100 work just can be allocated To the first transformator T1 and the second transformator T2.And the structural material of the first transformator T1 and the second transformator T2 is close, thus The voltage being inputted by Switching Power Supply 100 just can be evenly distributed to the first transformator T1 and the second transformator T2.First transformation Device T1 can bear the voltage within 6KV, and realizes electrical isolation, and the second transformator T2 also can bear the electricity within 6KV Pressure, and also realize electrical isolation, and then the electricity within 12KV after the first transformator T1 and the second transformator T2 series connection, can be born Pressure, and realize electrical isolation.

Therefore, in the Switching Power Supply 100 of the present embodiment, Switching Power Supply 100 can pass through the first transformator T1 and second The series connection of transformator T2 and realize between the input power of outside and the load that coupled of the second transformator T2 at least 10KV voltage The electrical isolation of grade.

Referring to this utility model embodiment illustrated in fig. 3 provides a kind of module map of ammeter 200.Above-mentioned switch electricity Source 100 is applied to this ammeter 200.Ammeter 200 includes：First rectifying and voltage-stabilizing device 210, the second fairing 230, the 3rd rectification Stable-pressure device 250, metering module 220, communication module 260, control module 240, testing circuit 270, the first photoelectrical coupler OC1, the second photoelectrical coupler OC2, the 3rd photoelectrical coupler OC3 and the 4th photoelectrical coupler OC4.

Referring to this utility model embodiment illustrated in fig. 4 provides a kind of circuit diagram of ammeter 200.

First rectifying and voltage-stabilizing device 210 is used for carry out rectification by output port BB ' output the first blood pressure lowering pulse voltage And voltage stabilizing, thus the first blood pressure lowering pulse voltage is converted to DC signal output to metering module 220.Preferably, the first rectification The input of stable-pressure device 210 is coupled with the first secondary coil cc ' by output port BB ', and the first secondary coil cc ' produces First blood pressure lowering pulse voltage can input the first rectifying and voltage-stabilizing device 210.First fall to input for first rectifying and voltage-stabilizing device 210 Pressure pulse voltage carries out rectification and voltage stabilizing such that it is able to be converted to direct current signal and export the first blood pressure lowering pulse voltage of input To in metering module 220.Metering module 220 by with control module 240 couple the circuit being measured energy data defeated Go out to control module 240.The input of the second fairing 230 is coupled with the second secondary coil dd ' by output port CC ', Second fairing 230 can be used for exporting the second blood pressure lowering pulse voltage by output port CC ' and carries out rectification, thus by second Blood pressure lowering pulse voltage is converted to DC signal output to control module 240, to provide the power supply of control module 240.Control module 240 are used for by the coupling with metering module 220, thus the operating state data of the circuit receiving is integrated.Control After module 240 can be integrated, the operating state data of circuit is transferred to communication module 260, thus realizing and communication module 260 Between data interaction.Preferably, the second fairing 230 includes：3rd diode D3, the 4th electric capacity C4, the first inductance L1 With the 5th electric capacity C5.The anode of the 3rd diode D3 is coupled with one end of the second secondary coil dd ', the negative electrode of the 3rd diode D3 Couple with one end of the 4th electric capacity C4, the other end of the 4th electric capacity C4 couples and is grounded with the other end of the second secondary coil dd '. One end of first inductance L1 is coupled with one end of the 4th electric capacity C4, the other end of the first inductance L1 and one end coupling of the 5th electric capacity C5 Close.5th other end of electric capacity C5 and coupling of the other end of the 4th electric capacity C4, the two ends of the 5th electric capacity C5 are all and control module 240 coupling.

By the filtering of the 3rd diode D3, the rectification of the 4th electric capacity C4 and the 5th electric capacity C5 and the first inductance L1, thus Second blood pressure lowering pulse voltage can be converted to direct current signal input control module 240, to provide the power supply of control module 240.

The input of the 3rd rectifying and voltage-stabilizing device 250 passes through the secondary coil coupling of input port DD ' and the second transformator T2 Close, the 3rd rectifying and voltage-stabilizing device 250 can be used for carry out rectification and voltage stabilizing by output port DD ' output buck pulse signal, Thus blood pressure lowering pulse signal is converted to direct current signal be input to communication module 260, to provide the power supply of communication module 260.Logical Letter module 260 can be used for being transmitted the operating state data of circuit such that it is able to realize the manipulation to ammeter 200 and far Range monitoring.Optionally, communication module 260 can be RS-485 communication module.In the present embodiment, by the first transformator T1 and The series connection of the second transformator T2, so that reach 10KV electrical isolation between RS-485 communication module and electrical network.Thus effectively improving Personnel carry out safety during operation and maintenance by RS-485 communication module.And reach between RS-485 communication module and electrical network Also the stability of ammeter work and reliability can be made to effectively improve to 10KV electrical isolation.

Preferably, the 3rd rectifying and voltage-stabilizing device 250 includes：Rectification circuit and mu balanced circuit.Rectification circuit includes：Four or two Pole pipe D4, the 6th electric capacity C6, mu balanced circuit can be voltage stabilizing chip U2.The anode of the 4th diode D4 and the second transformator T2 pair One end coupling of sideline circle, the negative electrode of the 4th diode D4 is coupled with one end of the 6th electric capacity C6.The other end of the 6th electric capacity C6 Couple and be grounded with the other end of the second transformator T2 secondary coil.The input Vin's of voltage stabilizing chip U2 and the 6th electric capacity C6 One end couples, and the other end of the earth terminal GND and the 6th electric capacity C6 of voltage stabilizing chip U2 is altogether.The output end vo ut of voltage stabilizing chip U2 Couple with one end of the 7th electric capacity C7, the other end ground connection of the 7th electric capacity C7.The two ends of the 7th electric capacity C7 all with communication module 260 Coupling.

The blood pressure lowering pulse signal of the second transformator T2 secondary coil output can be turned by the rectification of the 4th diode D4 Change direct current signal.Direct current signal passes through input voltage stabilizing chip U2 and exports communication module 260 by after its voltage stabilizing, to provide communication The power supply of module 260.

In the present embodiment, control module 240 is coupled with metering module 220 and communication module respectively, is to ensure control Data between metering module 220 and communication module 260 forms while interact module 240 respectively, also needs to ensure to control mould Block 240 electrical isolation good and metering module 220 and communication module 260 between respectively.As a kind of mode, control module 240 can realize coupling by the first photoelectrical coupler OC1 and the second photoelectrical coupler OC2 with communication module 260.First smooth thermocouple Clutch OC1 and the second photoelectrical coupler OC2 can be used in processing control module 240 after circuit operating state data with light The mode of electricity and communication module 260 interact transmission.First photoelectrical coupler OC1 includes：First light emitting diode D5 and One phototriode T1.The anode of the first light emitting diode D5 and negative electrode all couple with the outfan of control module 240.First light The emitter and collector of quick audion T1 is all coupled with the input of communication module 260.And the second photoelectrical coupler OC2 bag Include：Second light emitting diode D6 and the second phototriode T2.The anode of the second light emitting diode D6 and negative electrode all with the mould that communicates The outfan coupling of block 260.The input coupling all with control module 240 for the emitter and collector of the second phototriode T2 Close.

The outfan of control module 240 is coupled with the input of communication module 260 by the first photoelectrical coupler OC1, from And the digital signal of the operating state data of the circuit after processing is converted to analogue signal input first and lights by control module 240 The signal of telecommunication of input is converted to optical signal by luminous by diode D5, the first light emitting diode D5.First phototriode T1 By receiving the optical signal that the first light emitting diode D5 sends, thus converting optical signals to input communication module after the signal of telecommunication again 260.The analogue signal of input is again converted to after digital signal by communication module 260, and communication module 260 is by the work shape of circuit State data is transmitted such that it is able to realize the manipulation to ammeter 200 and remote monitoring.Meanwhile, communication module 260 work After the signal of telecommunication that the data making to produce is converted to, also optical signal can be converted to by the second light emitting diode D6.Second photosensitive three Pole pipe T2 is by receiving the optical signal that the second light emitting diode D6 sends, thus input control after converting optical signals to the signal of telecommunication again Molding block 240.

First photoelectrical coupler OC1 has photoelectricity transmission effect, thus by the first photoelectrical coupler OC1 to signal transmission While, also achieve the electrical isolation between control module 240 and communication module 260.By the second photoelectrical coupler OC2's Photoelectricity transmission effect, thus while realizing communication module 260 and signal can be fed back to control module 240, also realize again Electrical isolation between control module 240 and communication module 260.

Alternatively, control module 240 and metering module 220 can pass through the 3rd photoelectrical coupler OC3 and the 4th Photoelectrical coupler OC4 realizes coupling.3rd photoelectrical coupler OC3 and the 4th photoelectrical coupler OC4 can be used in control module In the way of photoelectricity and metering module 220 interacts transmission to the energy data of 240 receptions and the circuit processing.3rd smooth thermocouple Clutch OC3 includes：3rd light emitting diode D7 and the 3rd phototriode T3.The anode of the 3rd light emitting diode D7 and negative electrode are equal Outfan coupling with metering module 220.The emitter and collector of the 3rd phototriode T3 is all defeated with control module 240 Enter end coupling.And the 4th photoelectrical coupler OC4 includes：4th light emitting diode D8 and the 4th phototriode T4.4th lights The anode of diode D8 and negative electrode are all coupled with the outfan of control module 240.The emitter stage of the 4th phototriode T4 and collection Electrode is all coupled with the input of metering module 220.

By the 3rd photoelectrical coupler OC3 and the had photoelectricity transmission effect of the 4th photoelectrical coupler OC4, such that it is able to incite somebody to action Signal between metering module 220 and control module 240 is interacted in the form of photoelectricity, and then is capable of metering module Electrical isolation between 220 and control module 240.

The present embodiment is additionally provided with testing circuit 270, and testing circuit 270 is used for the direct current to the second fairing 230 output Signal is acquired, and is entered into control chip U1, so that control chip U1 adjusts field effect according to the signal value of input Pipe Q1 cut-offs frequency.While for ensureing that testing circuit 270 is coupled with control chip U1, also there is good electrical isolation, The 5th photoelectrical coupler OC5 can be provided between testing circuit 270 and control chip U1.5th photoelectrical coupler OC5 is used for examining The direct current signal of slowdown monitoring circuit 270 input is transmitted in the way of photoelectricity, and is entered into control chip U1.

Preferably, testing circuit 270 includes：3rd resistor R3, the 4th resistance R4, the 5th resistance R5, the 6th resistance R6, Seven resistance R7, the 8th electric capacity C8 and three terminal regulator U3.5th photoelectrical coupler OC5 includes：5th light emitting diode D9 and Five phototriode T5.

One end of 3rd resistor R3 is coupled with one end of the first inductance L1, the other end of 3rd resistor R3 and the 4th resistance R4 One end coupling.The other end of the 4th resistance R4 is coupled with the other end of the 5th electric capacity C5.One end of 4th resistance R4 is also with One end coupling of five resistance R5, the other end of the 5th resistance R5 is coupled with one end of the 8th electric capacity C8.8th electric capacity C8's is another End is coupled with the negative electrode of three terminal regulator U3.The reference voltage end of three terminal regulator U3 is coupled with one end of the 4th resistance R4.Three The anode of end manostat U3 is coupled with the other end of the 4th resistance R4.The negative electrode of three terminal regulator U3 also with the 6th resistance R6 one End coupling, the other end of the 6th resistance R6 is coupled with one end of the first inductance L1 and one end of the 7th resistance R7 respectively.7th electricity The other end of resistance R7 couples with the anode of the 5th light emitting diode D9, the negative electrode of the 5th light emitting diode D9 and three terminal regulator U3 Negative electrode coupling.The colelctor electrode of the 5th phototriode T5 is coupled with one end of the 3rd electric capacity C3, and the 5th phototriode T5 Emitter stage couple with the ground reference end of the 3rd electric capacity C3.

The direct current signal of the second fairing 230 output can export in testing circuit 270.By three terminal regulator U3 Voltage stabilizing, thus by after voltage stabilizing direct current signal input the 5th light emitting diode D9.5th light emitting diode D9 will by lighting The signal of telecommunication of input is converted to optical signal, and optionally, the 5th light emitting diode D9 can be infrarede emitting diode.5th is photosensitive Audion T5 is by receiving the optical signal that the 5th light emitting diode D9 sends, thus exporting after converting optical signals to the signal of telecommunication again Feedback voltage end FB to control chip U1.The defecation of the signal of telecommunication according to feedback for the control chip U1 can control field effect transistor Q1 Make-and-break time, thus adjusting output port BB ', output port CC ' and the frequency of output port DD ' output pulse signal is formed Stable signal output, thus providing stable DC signal to metering module 220, control module 240 and communication module 260, enters And stable being operated.

In the ammeter 200 of the offer of the present embodiment, above-mentioned Switching Power Supply 100 is applied to this ammeter 200.Due to first There is between each secondary coil of transformator T1 the electrical isolation of 6KV, and the primary coil and second of the second transformator T2 Also there is between the secondary coil of transformator T2 the electrical isolation of 6KV, thus metering module 220 and communication module 260 mutual it Between just can have at least electrical isolation of 10KV.The second secondary coil dd ' of the first transformator T1 couples the second fairing 230, and the second fairing 230 couples with control module 240, so by the first transformator T1 achieve external power source and The electrical isolation of 6KV between control module 240.In the ammeter 200 of the present embodiment, communication module 260 directly manipulates for personnel Or the contact module of remote control.By the second secondary coil dd ' of the first transformator T1 and the second transformator T2 is former After the circle coupling of sideline, the secondary coil of the second transformator T2 is coupled with the 3rd rectifying and voltage-stabilizing device 250, the 3rd rectifying and voltage-stabilizing device 250 are coupled with communication module 260 again, and then are capable of the electrical isolation of 10KV between external power source and communication module 260, Limits improve the safety that personnel manipulate to it.Furthermore, due to control module 240 respectively with metering module 220 and communicating Module 260 couples, thus can pass through the first photoelectrical coupler OC1 and the second light between communication module 260 and control module 240 Electric coupler OC2 realizes coupling.By the photoelectricity transmission effect of the first photoelectrical coupler OC1 and the second photoelectrical coupler OC2, real While having showed data interaction between control module 240 and communication module 260, due to its photoelectricity transmission effect, also achieve control Electrical isolation between molding block 240 and communication module 260.And then improve manipulation communication module 260 safety.And measure mould Between block 220 and control module 240, then coupling can be realized by the 3rd photoelectrical coupler OC3 and the 4th photoelectrical coupler OC4 Close.By the photoelectricity transmission effect of the 3rd photoelectrical coupler OC3 and the 4th photoelectrical coupler OC4 it is achieved that control module 240 with Between metering module 220 while data interaction, due to its photoelectricity transmission effect, also achieve control module 240 and metering mould Electrical isolation between block 220.And then the reliability improving circuit and safety can be imitated.

In sum, this utility model provides a kind of switching voltage 100 and the ammeter 200 applying this Switching Power Supply 100, Coupled with the primary coil of the first transformator T1 by external power source, the secondary coil of the first transformator T1 and the second transformator T2 Primary coil coupling, the secondary coil of the second transformator T2 with load couple.

First transformator T1 is used for the secondary coil by the primary coil of the first transformator T1 and the first transformator T1 Galvanomagnetic-effect is transmitted, and the input voltage regulation of external power source is first voltage signal, and by first voltage signal input The primary coil of the second transformator.So that the secondary coil of the primary coil of the first transformator T1 and the first transformator T1 bears electricity While pressure, external power source and the second transformator T2 electrical isolation.

Second transformator T2 is used for the secondary coil by the primary coil of the second transformator T2 and the second transformator T2 Galvanomagnetic-effect is transmitted, and first voltage Signal Regulation is second voltage signal, and second voltage signal input is loaded, with While making the primary coil of the second transformator T2 and the secondary coil of the second transformator T2 bear voltage, the first transformator with negative On-board electrical is isolated.

First transformator T1 and the second transformator T2 series connection, the voltage of input just can be assigned to the first transformator T1 and Second transformator T2.The insulant that the secondary coil of the primary coil of the first transformator T1 and the first transformator T1 is provided with can Ensure that the dielectric strength between the primary coil of the first transformator T1 and the secondary coil of the first transformator T1 reaches 6KV, can Enough realize the electrical isolation of 6KV.And that the secondary coil of the primary coil of the second transformator T2 and the second transformator T2 is provided with is exhausted Edge material ensure that the dielectric strength between the primary coil of the second transformator T2 and the secondary coil of the second transformator T2 6KV can be reached, be also capable of the electrical isolation of 6KV.After first transformator T1 and the second transformator T2 series connection, input Voltage just can be assigned to the first transformator T1 and the second transformator T2.And then first transformator T1 and the second transformator T2 string The voltage within 12KV can be born after connection, and realize electrical isolation.

The cascaded structure of the first transformator T1 and the second transformator T2 is applied in ammeter 200, and ammeter 200 passes through first and becomes The series connection of depressor T1 and the second transformator T2 and realize at least 10KV electric pressure between the input power of outside and ammeter 200 Electrical isolation, and then significantly improve the insulation values of ammeter 200, so that ammeter 200 bears higher pulse voltage.

The foregoing is only preferred embodiment of the present utility model, be not limited to this utility model, for this For the technical staff in field, this utility model can have various modifications and variations.All of the present utility model spirit and principle Within, any modification, equivalent substitution and improvement made etc., should be included within protection domain of the present utility model.

Claims (10)

1. a kind of Switching Power Supply is it is characterised in that include：First transformator and the second transformator；External power source and described first The primary coil coupling of transformator, the secondary coil of described first transformator is coupled with the primary coil of described second transformator, The secondary coil of described second transformator is coupled with load；

Described first transformator is used for by the primary coil of described first transformator and the secondary coil of described first transformator Galvanomagnetic-effect the input voltage regulation of described external power source is first voltage signal, and by described first voltage signal input The primary coil of described second transformator, so that described external power source and described second transformator electrical isolation；

Described second transformator is used for by the primary coil of described second transformator and the secondary coil of described second transformator Galvanomagnetic-effect described first voltage Signal Regulation is second voltage signal, and by described second voltage signal output to described Load, so that described first transformator and described load electrical isolation.

2. Switching Power Supply according to claim 1 is it is characterised in that also include：Pulse control circuit and switch module, institute State switch module to include：First contact, the second contact and control end, the outfan of described pulse control circuit and described control end Coupling, described first contact is coupled with the primary coil of described first transformator, and described second contact is coupled with reference voltage end.

3. Switching Power Supply according to claim 2 is it is characterised in that the described primary coil bag of described first transformator Include：First primary coil and the second primary coil, one end of described first primary coil is coupled with described external power source, and described The other end of one primary coil and described first coupling contact points, one end of described second primary coil and described second contact coupling Close, the other end of described second primary coil is coupled with the power end of described pulse control circuit.

4. Switching Power Supply according to claim 3 is it is characterised in that described switch module includes field effect transistor, described field The grid of effect pipe is described control end, and the drain electrode of described field effect transistor is described first contact, the source electrode of described field effect transistor For described second contact.

5. a kind of ammeter is it is characterised in that include：Metering module, communication module, control module and such as claim 1-4 are appointed Switching Power Supply described in one, the input of the input of described metering module and described control module all with described first transformation The secondary coil coupling of device；The secondary coil of described second transformator is coupled with described communication module, described communication module and institute State control module coupling.

6. ammeter according to claim 5 is it is characterised in that the secondary coil of described first transformator includes：First is secondary Sideline circle and the second secondary coil, the described first secondary coil and described second secondary coil institute all with described first transformator State primary coil coupling, the input of described metering module is coupled with described first secondary coil, the input of described control module End is coupled with described second secondary coil, and described second secondary coil is coupled with the primary coil of described second transformator.

7. ammeter according to claim 5 is it is characterised in that described communication module passes through the first light with described control module Electric coupler and the coupling of the second photoelectrical coupler, described first photoelectrical coupler includes：First light emitting diode and first photosensitive Audion；The two ends of described first light emitting diode are all coupled with the outfan of described control module, described first photosensitive three poles The collector terminal of pipe and emitter terminal are all coupled with the input of described communication module；Described second photoelectrical coupler includes：The Two light emitting diodes and the second phototriode；The outfan all with described communication module for the two ends of described second light emitting diode Coupling, the collector terminal of described second phototriode and emitter terminal are all coupled with the input of described control module.

8. ammeter according to claim 5 is it is characterised in that also include：Testing circuit, the input of described testing circuit Couple with the input of described control module, the outfan of described testing circuit is coupled with the input of pulse control circuit.

9. ammeter according to claim 8 is it is characterised in that described testing circuit is provided with the 5th photoelectrical coupler, described 5th photoelectrical coupler includes：5th light emitting diode and the 5th phototriode；The two ends of described 5th light emitting diode are equal Couple with the outfan of described testing circuit, the collector and emitter of described 5th phototriode all with described Pulse Width Control The input coupling of circuit.

10. ammeter according to claim 5 is it is characterised in that also include：Rectification module and Voltage stabilizing module, described rectification The input of module is coupled with the secondary coil of described second transformator, the outfan of described rectification module and described Voltage stabilizing module Input coupling, the outfan of described Voltage stabilizing module coupled with described communication module.