CN207021893U

CN207021893U - One kind matches somebody with somebody the low apparent power digital circuit of network source

Info

Publication number: CN207021893U
Application number: CN201720527395.XU
Authority: CN
Inventors: 陈涛
Original assignee: SHENZHEN CE-STAR ELECTRONIC TECHNOLOGY Co Ltd
Current assignee: SHENZHEN CE-STAR ELECTRONIC TECHNOLOGY Co Ltd
Priority date: 2017-03-17
Filing date: 2017-05-12
Publication date: 2018-02-16
Anticipated expiration: 2027-05-12
Also published as: CN107086769A

Abstract

One kind matches somebody with somebody the low apparent power digital circuit of network source, in terms of being related to a kind of low apparent power digital circuit improvement with network source.When solving the output of existing power supply steady operation, the relatively low technical problem of the PF values of input is corrected, rectification circuit includes the power model rectification circuit and PFC module rectification circuit being connected respectively with EMC filter circuit ac output end；The power model rectification circuit DC output end is directly connected to the pwm control circuit, when drawing load Instantaneous peak power for power supply, there is provided power conversion stage energy；The DC output end of the PFC module rectification circuit reconnects the pwm control circuit after pfc circuit, when being in underloading steady operation for power supply, there is provided pfc circuit carries out PFC level energy needed for PFC.Lift power factor of the power module in underloading stable state so that the apparent power consumption inputted during underloading stable state substantially reduces, pollution very little of the input harmonic current to power network.

Description

One kind matches somebody with somebody the low apparent power digital circuit of network source

Technical field

The utility model belongs to distribution field of power supplies, more particularly to a kind of to match somebody with somebody the low apparent power digital circuit improvement side of network source Face.

Background technology

The load properties faced with network source in the environment of application are：1. kernel cell circuit and communication equipment, work( Consume more stable, usual power is typically within 15W；2. requiring supplementation with the electric energy of battery, had in charging more stable Electrical energy demands, electric energy needed for after battery is fully charged is seldom, but needs to realize battery impulse electricity management；3. spring operation is opened Close, it is that transient power is bigger to switch in divide-shut brake, 500W or so is generally reached, when switch is failure to actuate, without power consumption.State's net is public Apparent power consumption of department's regulation power supply when steady operation band carries core cell and communication equipment is no more than 30VA.

There is the power supply of two kinds of forms on the market at present in the way of multiple power source circuit design, as shown in Figure 1 and Figure 2：Its It is the making form of traditional power supply shown in middle Fig. 1, mainly meets that peak power requirements can drag spring Operation switch, main bag Include 1, EMC filter circuit；2nd, high-voltage rectifier；3rd, pwm control circuit；4th, circuit for power conversion；5th, output rectification filter electricity Road；6th, output detection protection circuit；7th, battery management module etc..The power supply of this form is due to no input power factor school Orthofunction, harmonic current can not meet distribution terminal equipment to the seriously polluted of power network（FTU/DTU）Supporting power supply The requirement of apparent power consumption in steady operation, the power factor of input are that PF values only have 0.5 or so, power supply according to 80% effect Rate calculates, and output end band carries 15W, and apparent power consumption S=15/0.8/0.5=37.5VA is calculated, and surveys apparent during steady operation Power consumption is 49VA.Actual test is carried out to a kind of product of prior art schematic circuit, power supply underloading 15W inputs apparent when exporting Power consumption is 49.4VA.

Another form of power supply is to increase PFC on the basis of Fig. 1（PFC）Circuit, as shown in Fig. 2 increasing The purpose for adding the pfc circuit for PFC be according to apparent energy S=active-power P/power in power triangle because Number PF values, the requirement of apparent energy could be only reduced after the lifting of PF values；Such power supply is due to transient peak work(to be met The requirement of rate, the power of general pfc circuit are also required to accomplish 500W or so, and now the topological form of PFC levels typically uses electric current The pfc circuit of CCM patterns, power factor of the power supply in peak power be PF values up to more than 0.95, and work as power supply steady operation Due to the electric current very little of input when exporting 15W power, duty when pfc circuit works is smaller, and voltage and electric current follow Property it is bad, cause correct input PF values only have 0.7 or so, power supply according to 80% efficiency calculation, output end band carry 15W, count Calculation draws apparent power consumption S=15/0.8/0.7=26.78VA, and apparent power consumption when surveying steady operation is 28.2VA.It is but such Power supply to greatly increase in cost due to increasing the pfc circuit of ad eundem peak power, and apparent power consumption during steady operation Be near the mark the limit value of requirement, because the discreteness of component is it is difficult to ensure that power supply apparent in steady operation during batch production The not exceeded phenomenon of power consumption.

The content of the invention

In summary, when the purpose of this utility model is to solve the output of existing power supply steady operation, input is corrected PF values are relatively low, and the pfc circuit of ad eundem peak power to greatly increase in cost, and due to component during batch production Discreteness proposes a kind of to regard with network source is low it is difficult to ensure that power supply not exceeded technical problem of apparent power consumption in steady operation In power digital circuit.

To solve the technical problem that is proposed of the utility model, the technical scheme used for：One kind matches somebody with somebody the low apparent of network source Power digital circuit, including EMC filter circuit, rectification circuit, pwm control circuit, circuit for power conversion, output rectifier and filter, Output detection protection circuit and battery management module；Described EMC filter circuit connection AC input, EMC filter circuit Output end detects through the rectification circuit, pwm control circuit, circuit for power conversion, output rectifier and filter and output successively Protection circuit attended operation equipment；The output rectifier and filter connects battery, battery management module through battery management module It is also connected with pwm control circuit；It is characterized in that：Described rectification circuit include respectively with EMC filter circuit ac output end The power model rectification circuit and PFC module rectification circuit of connection；The power model rectification circuit DC output end directly connects The pwm control circuit is connect, when drawing load Instantaneous peak power for power supply, there is provided power conversion stage energy；The PFC module is whole The DC output end of current circuit reconnects the pwm control circuit after pfc circuit, and underloading steady operation is in for power supply When, there is provided pfc circuit carries out PFC level energy needed for PFC.

Include as the technical scheme that the utility model further limits：

Described pfc circuit includes PFC control chips, and be connected respectively with PFC control chips be used for power because The power factor compensation circuit of number correction, for carrying out the overpower of current detecting and overcurrent protection to power factor compensation circuit Protection circuit, and for entering the output voltage sampling of line output voltage sampling to the power model rectification circuit DC output end Circuit.

Described PFC control chips use model FAN7930C PFC control chips.

Described power factor compensation circuit is the active pfc circuit being made up of inductance L5.

Described overpower-protection circuit includes as the power factor compensation circuit described in PFC control chip drive controls The metal-oxide-semiconductor Q27 being turned on and off, and the electric current for being flowed through to metal-oxide-semiconductor Q27 carry out being sampled as PFC control chips offer electricity The MOS current detection circuits of source sampling signal.

The beneficial effects of the utility model are：The utility model provides a kind of new think of in the theory of original Power Management Design Road, rectification circuit include power model rectification circuit and PFC module rectification circuit；Power model rectification circuit is drawn for power supply When carrying Instantaneous peak power, there is provided power conversion stage energy；The PFC module rectification circuit is in underloading stable state work for power supply When making, there is provided pfc circuit carries out PFC level energy needed for PFC；Neither by distribution terminal equipment（FTU/DTU）It is supporting Power supply lifts the requirement of PF values, and then apparent work(in the limitation of transient peak power when and can meets steady operation The standard of consumption, and circuit is simple, cost is cheap, is adapted to large-scale production, test application.

It is compared with the prior art the power factor that will greatly promote power module in underloading stable state so that during underloading stable state The apparent power consumption of input substantially reduces, and pollution very little of the input harmonic current to power network, harmonic component can pass through EN61000- CLASS C grades in 3-2, though adding power model rectification on circuit, whole PFC power can accomplish very little, Component greatly reduces cost in type selecting, and whole circuit is easy to control, mature and reliable.Compared with prior art, this hair It is bright that there is advantages below：The accurate low-power consumption requirement of state's network mark can be substantially reduced, circuit is ripe, and reliably, cost is cheap, versatility By force, circuit is implemented easy, is adapted to large-scale production and application.

Brief description of the drawings

Fig. 1 is a kind of power principle block diagram of prior art；

Fig. 2 is another power principle block diagram of prior art；

Fig. 3 is power principle block diagram provided by the utility model；

The circuit theory diagrams of the low-power consumption part of Fig. 4 examples.

Embodiment

Structure of the present utility model is made further below in conjunction with accompanying drawing and the preferable specific embodiment of the utility model Explanation.

Shown in reference picture 3 and Fig. 4, the utility model matches somebody with somebody the low apparent power digital circuit of network source, including EMC（Electromagnetic compatibility Property）Filter circuit, rectification circuit, pwm control circuit, circuit for power conversion, output rectifier and filter, output detection protection electricity Road and battery management module.

Described EMC filter circuit connection AC input, input AC electricity carry out EMC suppressions by EMC filter circuit Exported after system to rectification circuit.F1 is input fuse in Fig. 4；Piezo-resistance VR1, electric capacity CY1, electric capacity CY2, electric capacity CX1, electricity Feel L1, thermistor NTC composition input EMC filter circuit, resistance R1, resistance R2, the bleeder resistance that resistance R3 is electric capacity CX1.

It is whole that rectification circuit of the present utility model includes the power model being connected respectively with EMC filter circuit ac output end Current circuit BRG1 and PFC module rectification circuit BD1；The power model rectification circuit BRG1 DC output ends are direct through PFC+ ends The pwm control circuit is connected, when power model rectification circuit BRG1 is used for power supply drawing load Instantaneous peak power, there is provided power turns Change a grade energy；The DC output end of the PFC module rectification circuit BD1 connects the PWM through PFC+ ends again after pfc circuit and controlled Circuit processed, when PFC module rectification circuit BD1 is in underloading steady operation for power supply, there is provided pfc circuit carries out power factor school Just required PFC levels energy.

Described pfc circuit includes model FAN7930C PFC control chip U1, and controls core with PFC respectively The power factor compensation circuit for PFC of piece U1 connections, for carrying out electric current inspection to power factor compensation circuit Survey and the overpower-protection circuit of overcurrent protection, and for carrying out output electricity to the power model rectification circuit DC output end Press the output voltage sample circuit of sampling.Described power factor compensation circuit is the active pfc circuit being made up of inductance L5. Described overpower-protection circuit includes to be driven by PFC control chips U1, for controlling described power factor compensation circuit The metal-oxide-semiconductor Q27 being turned on and off, and the electric current for being flowed through to metal-oxide-semiconductor Q27 carry out being sampled as PFC control chips U1 offers The MOS current detection circuits of power supply sampled signal.MOS current detection circuits are made up of resistance R6, resistance R9 and electric capacity C4.It is described Output voltage sample circuit be made up of resistance R10, resistance R11, resistance R12 and resistance R 14.

The pfc circuit course of work is：When power supply is in the output of underloading stable state, input AC electricity passes through PFC module rectification Circuit BD1 rectifications flow to PFC levels, and PFC control chips U1 driving metal-oxide-semiconductors Q27 is turned on, power factor compensation circuit normal work, Now input power factor is corrected, and PF values reach more than 0.97；When there is transient peak power in load, PFC controls Chip U1 detects that metal-oxide-semiconductor Q27 flows through high current and carries out overpower protection, and PFC control chips U1 driving metal-oxide-semiconductors Q27 disconnects, Output must be corrected by now closing input power factor；Now exporting transient peak power will be by power model rectification circuit BRG1 There is provided after rectification；When power supply is again introduced into the output of underloading stable state, PFC control chips U1 detects output voltage electric current and pressed through without mistake Signal is flowed, PFC control chips U1 will drive metal-oxide-semiconductor Q27 to turn on again, power factor compensation circuit normal work.

The utility model improve to improve power supply in underloading stable state power factor the power of pfc circuit can be accomplished it is several Within ten watts, meet power required when power and the supplement battery charging of normal steady state, the PWM controls of power supply, power Conversion, output rectification filter, output detection protection, battery management module etc. can not be altered, and that is to say pwm control circuit through work( Rate change-over circuit, output rectifier and filter and output detection protection circuit attended operation equipment；The output rectification filter electricity Road connects battery through battery management module, and battery management module is also connected with pwm control circuit.When power supply is in underloading steady operation When, PFC capability corrections are in normal operating conditions, improve PF values and reach more than 0.97, when power supply, which is drawn, carries Instantaneous peak power, Now considerably beyond the power output of pfc circuit, at this moment pfc circuit is in the state of overcurrent protection, power conversion stage Energy will provide after power model rectification, and when transient peak power transition is to underloading stable state, pfc circuit will restart just Often work, the unaffected and can of transient peak power was so both met and has met that the output of underloading stable state is wanting for low apparent power consumption Ask.

It is compared with the prior art the power factor that will greatly promote power module in underloading stable state so that during underloading stable state The apparent power consumption of input substantially reduces, and pollution very little of the input harmonic current to power network, harmonic component can pass through EN61000- CLASS C grades in 3-2, though adding power model rectification on circuit, whole PFC power can accomplish very little, Component greatly reduces cost in type selecting, versatile, and whole circuit is easy to control, mature and reliable, 4, circuit implement hold Easily, it is adapted to large-scale production and application.

The above described is only a preferred embodiment of the present invention, any formal limitation not is made to the present invention.Though So present invention preferred embodiment is disclosed above, but is not limited to the present invention.Any those skilled in the art, Without departing from the scope of the technical proposal of the invention, all using the methods and technical content of the disclosure above to the technology of the present invention Scheme makes many changes and modifications, or is revised as the equivalent embodiment of equivalent variations.Therefore, it is every without departing from the technology of the present invention The content of scheme, according to the present invention technical spirit to it is made for any of the above embodiments how simple modification, equivalent variation and modification, It is in technical solution of the present invention protection domain.

Claims

1. one kind matches somebody with somebody the low apparent power digital circuit of network source, including EMC filter circuit, rectification circuit, pwm control circuit, power turn Change circuit, output rectifier and filter, output detection protection circuit and battery management module；Described EMC filter circuit connection AC input, EMC filter circuit output end is successively through the rectification circuit, pwm control circuit, circuit for power conversion, defeated Go out current rectifying and wave filtering circuit and output detection protection circuit attended operation equipment；The output rectifier and filter is through battery management mould Block connects battery, and battery management module is also connected with pwm control circuit；It is characterized in that：Described rectification circuit includes difference The power model rectification circuit and PFC module rectification circuit being connected with EMC filter circuit ac output end；The power model is whole Current circuit DC output end is directly connected to the pwm control circuit, when drawing load Instantaneous peak power for power supply, there is provided power turns Change a grade energy；The DC output end of the PFC module rectification circuit reconnects the pwm control circuit after pfc circuit, is used for When power supply is in underloading steady operation, there is provided pfc circuit carries out PFC level energy needed for PFC.

2. one kind according to claim 1 matches somebody with somebody the low apparent power digital circuit of network source, it is characterised in that：Described pfc circuit Include PFC control chips, and the power factor compensation electricity for PFC being connected respectively with PFC control chips Road, for carrying out the overpower-protection circuit of current detecting and overcurrent protection to power factor compensation circuit, and for described Power model rectification circuit DC output end enters the output voltage sample circuit of line output voltage sampling.

3. one kind according to claim 2 matches somebody with somebody the low apparent power digital circuit of network source, it is characterised in that：Described PFC controls Chip uses model FAN7930C PFC control chips.

4. one kind according to claim 2 matches somebody with somebody the low apparent power digital circuit of network source, it is characterised in that：Described power factor Compensation circuit is the active pfc circuit being made up of inductance L5.

5. one kind according to claim 2 matches somebody with somebody the low apparent power digital circuit of network source, it is characterised in that：Described overpower is protected Protection circuit includes the metal-oxide-semiconductor Q27 being turned on and off as the power factor compensation circuit described in PFC control chip drive controls, And the electric current for being flowed through to metal-oxide-semiconductor Q27 carries out being sampled as the MOS electric currents inspection that PFC control chips provide power supply sampled signal Slowdown monitoring circuit.