CN2067425U - Safety precision unintermittent dc power supply - Google Patents

Abstract

The utility model relates to a combined type direct-current voltage stabilizing power supply, comprising a voltage reduction rectification filtering circuit, the precise reference circuit and the high-voltage circuit of the voltage reduction rectification filtering circuit, a voltage reduction rectification circuit, and the switching voltage stabilizing circuit of the voltage reduction rectification circuit. The utility model is characterized in that the output of the switching voltage stabilizing circuit is connected with the linear voltage stabilizing circuit of a field effect tube so as to form a combined power supply; the switching voltage stabilizing circuit is connected with the under voltage protection circuit of storage batteries. The utility model has the advantages of simple structure, increased efficiency, small output resistance and noise, effective protection for the storage batteries, and extended service life.

Description

Safety precision unintermittent dc power supply

The utility model relates to a kind of D.C. regulated power supply, particularly a kind of combined DC stabilized voltage supply.

At present, in, the miniwatt D.C. regulated power supply mostly is the linear stabilized voltage supply of transistor, this class voltage stabilizer allows going up in limited time of electricity consumption scope when input voltage is raised to, because of adjusting the pipe collection--emitter voltage is very high dissipate more high-power.A kind of " full-automatic UPS multifunctional accurate stabilized voltage supply " arranged, though its core component--high-power integrated package of pressure-stabilizing itself has overvoltage and excess current automatic protection functions, but, thereby be difficult for power is done more because of its peak power output is 40 watts (seeing 1990.1.18 " electronic market newspaper "); Simultaneously; several mechanical relays in this power supply also have certain influence to power supply reliability; " principle of D.C. regulated power supply and design " book that the People's Telecon Publishing House publishes has been introduced the basic formula of four kinds " packet type switch type stabilized voltage supplys "; they all are to be combined by switching regulator and the linear voltage stabilizer of transistor; though they can solve the problem of high-voltage large current; but they are the no-output over-voltage protecting function all, adjusts pipe in case puncture the safety that will directly threaten the accurate electricity consumption instrument of back level.In addition, stabilized voltage supply often all will have accumulator supporting with it, but above power supply low-voltage variation function of no storage battery all.Acidity that the dispatching communication mouth of systems such as farm work communication port, power supply and the traffic of the postal system is used and alkaline storage battery are well-known (damage 24 volt of 5 slight ampere-hour nickel-cadmium battery and will cause more than 600 yuan loss) because of the phenomenon of once in a while overdischarge premature damage.

The purpose of this utility model is exactly in order to overcome above-mentioned deficiency, provides a kind of safety accurate uninterrupted direct supply, and it has the accumulator under-voltage protection function, and its functional reliability improves greatly.

The utility model includes decompression rectifier filter circuit and accurate reference circuit and high-tension circuit; and step-down rectifying circuit and switch voltage-stabilizing circuit thereof; be characterized in connecing the field effect transistor linear voltage-stabilizing circuit again in the output of switch voltage-stabilizing circuit; constitute integrated drive generator, in switch voltage-stabilizing circuit, connect an accumulator under-voltage protecting circuit again.

Describe in detail below in conjunction with accompanying drawing:

Accompanying drawing is the utility model electrical schematic diagram.

As accompanying drawing, decompression rectifier filter circuit is by transformer B ₁, bridge rectifier block D ₁, capacitor C ₁Form, the direct current of its output send accurate reference circuit IC ₁With high-tension circuit IC ₂, accurate reference circuit IC ₁Be to be the mu balanced circuit of benchmark with accurate reference power supply, its output is as the reference power supply of accumulator under-voltage protecting circuit, high-tension circuit IC ₂Form by Sheffer stroke gate oscillator and transformer, the output high pressure, its output is connected with the grid of the field effect transistor T of field effect transistor linear voltage-stabilizing circuit; Step-down rectifying circuit is by transformer B ₁With bridge rectifying block D ₂Form, its rectification output is connected with switch voltage-stabilizing circuit, and switch voltage-stabilizing circuit is by control circuit IC ₃, controllable silicon SCR and big capacitor C ₂Form, wherein control circuit IC ₃Constitute control circuit IC by voltage comparator of forming with amplifier and current-limiting resistance ₃The control utmost point of output control controllable silicon SCR, control the charging current of accumulator E simultaneously.The output of switch voltage-stabilizing circuit is connected with the field effect transistor linear voltage-stabilizing circuit, and the field effect transistor linear voltage-stabilizing circuit is by field effect transistor T, stabilivolt DW ₁, transistor BG ₁, sample resistance R ₆, R ₇, R ₈, capacitor C ₃And by accurate reference power supply IC ₅And resistance R ₃, R ₄, R ₅The accurate stabilized voltage supply of the noble potential of forming constitutes, and the drain electrode of field effect transistor T is connected with the negative pole of controllable silicon SCR in the switch voltage-stabilizing circuit, and the source electrode of field effect transistor T is exported as power supply, and its grid meets transistor BG ₁Collector, stabilivolt DW ₁Be connected between the source electrode and grid of field effect transistor T transistor BG ₁The device of making comparisons, its emitter-base bandgap grading connects by accurate reference power supply IC ₅And resistance R ₃, R ₄, R ₅The accurate stabilized voltage supply of the noble potential of forming, transistor BG ₁Base stage connect by sample resistance R ₆, R ₇, R ₈The sample circuit of forming, this sample circuit R ₆, R ₇, R ₈Be attempted by power output end; The accumulator under-voltage protecting circuit is by sample circuit R ₁, R ₂, bleeder circuit R ₉, R ₁₀, bleeder circuit R ₁₁, R ₁₂, amplifier IC ₄, diode D ₅, D ₆, transistor BG ₂And front end circuit R ₁₃, R ₁₄Form sample circuit R ₁, R ₂With control circuit IC in the switch voltage-stabilizing circuit ₃Output connect, promptly in parallel with the two ends of accumulator E, its R ₁, R ₂Mid point and amplifier IC ₄Inverting input connect IC ₄In-phase input end and bleeder circuit R ₉, R ₁₀Mid point between meet an anti-phase diode D ₅, bleeder circuit R ₉, R ₁₀With accurate reference circuit IC ₁Output connect IC ₄Output meet bleeder circuit R ₁₁, R ₁₂With transistor BG ₂Front end circuit R ₁₃, R ₁₄, IC ₄In-phase input end and bleeder circuit R ₁₁, R ₁₂Mid point between meet an anti-phase diode D ₆, transistor BG ₂Collector output be connected with the grid of field effect transistor T in the field effect transistor linear voltage-stabilizing circuit.

The course of work of the present utility model is as follows, and as accompanying drawing, the 220V civil power is through transformer B ₁Step-down is again through bridge rectifier block D ₁Rectification and capacitor C ₁Output dc voltage is supplied with accurate reference circuit IC after the filtering ₁With high-tension circuit IC ₂, IC ₁Output as the reference power supply of accumulator under-voltage protecting circuit, IC ₂Output for the grid of field effect transistor T, simultaneously, the 220V civil power is through transformer B ₁Step-down and bridge rectifier block D ₂Obtain the 100HZ pulsating current after the rectification and deliver to control circuit IC in the switch voltage-stabilizing circuit ₃With controllable silicon SCR be anodal, control circuit IC ₃The control utmost point of control controllable silicon SCR, when the negative pole current potential of controllable silicon SCR was lower than desired pre-steady value, the controllable silicon SCR conducting was to big capacitor C ₂Charging (capacitor C ₂Double action with energy storage and filtering), the while also provides electric current for the field effect transistor T of field effect transistor linear voltage-stabilizing circuit, works as capacitor C ₂Voltage when rising to pre-steady value, control circuit IC ₃Just cut off the control utmost point path of controllable silicon SCR, controllable silicon SCR is ended; When power supply has output, when promptly field effect pipe T has output, big capacitor C ₂Necessary decline of voltage potential, when its voltage drops to the pre-steady value that is lower than requirement, the control circuit IC in the switch voltage-stabilizing circuit ₃Connect the grid of controllable silicon SCR again, and make its conducting, be big capacitor C ₂Charging also provides preceding step voltage for the field effect transistor in the field effect transistor linear voltage-stabilizing circuit of back level.Field effect transistor linear voltage-stabilizing circuit principle of work is that the source electrode of field effect transistor T is by fuse BX output, high-tension circuit IC ₂The high-tension electricity that produces is by comparator circuit transistor BG ₁Collector connect the grid of field effect transistor T, comparator circuit transistor BG ₁Base stage meet the sample resistance R that draws from power output end ₇On, by accurate reference power supply IC ₅And resistance R ₃, R ₄, R ₅The accurate stabilized voltage supply of the noble potential that constitutes (the reaching as high as 30V) benchmark of circuit as a comparison is connected to transistor BG ₁Emitter-base bandgap grading, between the grid of field effect transistor T and source electrode, meet a stabilivolt DW ₁, with protection field effect transistor T; When the power output end current potential reduces because of certain situation or raises, sample circuit R ₆, R ₇, R ₈A part that is about to its step-down value or the value of boosting is delivered to comparator circuit transistor BG ₁Base stage, with the accurate benchmark of the noble potential of emitter-base bandgap grading relatively, thereby decision is to reduce or rising transistor BG ₁Collector potential, that is the grid potential of field effect transistor T, reaching the purpose of adjusting output voltage values, if when power output end has rising slightly, comparator circuit transistor BG ₁Base potential raise BG then ₁Collector potential reduce, promptly the grid potential of field effect pipe T reduces, and makes field effect transistor T close a part, thereby the output voltage of power output end is reduced; Otherwise then raise, guarantee the stable of output voltage of the present utility model.When the utility model is done unloaded, the fully loaded variation in-15%～+ 10% the scope of 220V, can not survey the variation of its output voltage with import " DT890C type " digimer.

Accumulator under-voltage protecting circuit principle of work is as follows, as accompanying drawing, when civil power stop for and accumulator E voltage just often, the sample circuit R that draws from accumulator E anode ₁, R ₂The A point that last sampling obtains (meets amplifier IC ₄Inverting input) current potential is higher than the B point and (meets amplifier IC ₄In-phase input end) current potential, then amplifier IC ₄The output electronegative potential, transistor BG ₂By not conducting, then the field effect transistor T conducting in the field effect transistor linear voltage-stabilizing circuit has output, i.e. accumulator E discharge, and along with the reduction of accumulator E voltage, A point current potential descends gradually, when A point current potential is lower than B point current potential, amplifier IC ₄Output noble potential, then BG ₂Conducting makes the grounded-grid of field effect transistor T and ends, and then accumulator E does not discharge, and promptly begins to protect accumulator E; Simultaneously, at amplifier IC ₄The bleeder circuit R that output terminal connect ₁₁, R ₁₂On C point current potential be higher than bleeder circuit R ₉, R ₁₀On D point current potential, C point current potential is through diode D ₆Add B to point, make diode D ₅End; B point current potential raises; though at this moment A point current potential has certain rise to raise a little because of accumulator E parks electricity back voltage; but still be lower than new B point current potential, so field effect transistor T still ends, accumulator E still is in protected state; when supplying civil power again; higher because of the rising of charging effect accumulator E voltage, just make A point current potential be higher than new B point current potential, amplifier IC ₄The output electronegative potential, B point current potential restores accumulator E de-preservation state simultaneously.

When the utility model stops suddenly to supply at civil power, because diode D ₃, D ₄Existence, the utility model still can operate as normal, its switching time is extremely short, makes various dispatching communications or precision measurement not have a bit disruption, diode D ₃, D ₄Positive pole connect the positive pole of accumulator E, D ₃Negative pole meet bridge rectifier block D in the step-down rectifier filter circuit ₁Output terminal, D ₄Negative pole meet bridge rectifier block D in the step-down rectifying circuit ₂Output terminal.

The utility model is owing to adopt FET; with the big electric current of little Current Control; then it is simpler than the integrated drive generator structure that consists of with switching power supply and transistor voltage regulator; efficient is higher; heat endurance and radiation resistance are better; output resistance and noise are lower; in addition; the utility model is furnished with the battery under-voltage protecting circuit of integrated circuit control; changed in the past owing to using mechanical relay to make the not high defective of its reliability, can effectively avoid Accessory Battery because of the too early phenomenon of damage of once in a while overdischarge.

Claims (2)

1, the accurate uninterrupted direct supply of a kind of safety, it includes decompression rectifier filter circuit and accurate reference circuit and high-tension circuit, and step-down rectifying circuit and switch voltage-stabilizing circuit thereof, and decompression rectifier filter circuit is by transformer B ₁, bridge rectifier block D ₁, capacitor C ₁Form, its output meets accurate reference circuit IC ₁With high-tension circuit IC ₂, step-down rectifying circuit is by transformer B ₁With bridge rectifier block D ₂Form, its output is connected with switch voltage-stabilizing circuit, and switch voltage-stabilizing circuit is by control circuit IC ₃, controllable silicon SCR and big capacitor C ₂Form, it is characterized in that the output of switch voltage-stabilizing circuit connects the field effect transistor linear voltage-stabilizing circuit, constitute integrated drive generator, be connected to the accumulator under-voltage protecting circuit in switch voltage-stabilizing circuit, the field effect transistor linear voltage-stabilizing circuit is by field effect transistor T, stabilivolt DW ₁, transistor BG ₁, sample resistance R ₆, R ₇, R ₈, capacitor C ₃And by accurate reference power supply IC ₅And resistance R ₃, R ₄, R ₅The accurate stabilized voltage supply of the noble potential of forming constitutes, and the drain electrode of field effect transistor T is connected with the negative pole of controllable silicon SCR in the switch voltage-stabilizing circuit, and the source electrode of field effect transistor T is exported as power supply of the present utility model, and its grid meets transistor BG ₁Collector and high-tension circuit IC ₂Output, stabilivolt DW ₁Be connected between the source electrode and grid of field effect transistor T transistor BG ₁Device as a comparison, its emitter-base bandgap grading meet the accurate stabilized voltage supply (IC of noble potential ₅, R ₃, R ₄, R ₅), its base stage accesses the sample resistance R ₆, R ₇, R ₈The sample circuit of forming, this sample circuit R ₆, R ₇, R ₈Be attempted by power output end; The accumulator under-voltage protecting circuit is by sample circuit R ₁, R ₂, bleeder circuit R ₉, R ₁₀, bleeder circuit R ₁₁R ₁₂, amplifier IC ₄, diode D ₅, D ₆, transistor BG ₂And front end circuit R ₁₃, R ₁₄Form sample circuit R ₁, R ₂With control circuit IC in the switch voltage-stabilizing circuit ₃Output connect, promptly in parallel with the two ends of accumulator E, its R ₁, R ₂Mid point and amplifier IC ₄Inverting input connect IC ₄In-phase input end and bleeder circuit R ₉, R ₁₀Mid point between meet an anti-phase diode D ₅, bleeder circuit R ₉, R ₁₀With accurate reference circuit IC ₁Output connect amplifier IC ₄Output meet bleeder circuit R ₁₁, R ₁₂With transistor BG ₂Front end circuit R ₁₃, R ₁₄, IC ₄In-phase input end and bleeder circuit R ₁₁, R ₁₂Mid point between meet an anti-phase diode D ₆, transistor BG ₂Collector output be connected with the grid of field effect transistor T in the field effect transistor linear voltage-stabilizing circuit.

2, by the accurate uninterrupted direct supply of the described safety of claim 1, it is characterized in that diode D ₃, D ₄Positive pole connect the positive pole of accumulator E, D ₃Negative pole meet bridge rectifier block D in the decompression rectifier filter circuit ₁Output terminal, D ₄Negative pole meet bridge rectifier block D in the step-down rectifying circuit ₂Output terminal.