CN2084212U - Dynamic balance switch type dc regulated power supply - Google Patents

Abstract

The utility model relates to a dynamic balance switch type DC regulated power supply. The electronic circuit part comprises positive and negative power supplies with the same circuit construction and is mainly composed of a sampling part, a reference voltage part, a comparing part and a dynamic balance regulating part. The circuit is provided with no transformer, no voltage regulating tube, etc. The structure is simple, but the overall efficiency of the electrical power of the circuit can reach more than 99%, and the DC regulated voltage within 0-550V can be continuously obtained to satisfy the requirement of various electronic equipment to the DC regulated power supply.

Description

Dynamic balance switch type DC regulated power supply

The utility model relates to a kind of direct current voltage-stabilizing power supply, particularly realizes the D.C. regulated power supply of automatic voltage regulation in the dynamic balance switch mode.

D.C. regulated power supply of the prior art roughly divides three classes: the stabilized voltage supply of promptly connecting, parallel voltage-stabilizing power supply and pulse-width modulation switching power supply, wherein, the series connection stabilized voltage supply must be with the powerful voltage-reg-ulator tube unnecessary voltage between rectifier and the power source loads of decaying, and the ratio of consumed power is very big; Shunt regulator must come minute unnecessary electric current of consumption with stabilivolt single or combination.In addition, they generally all will use power transformer, thereby generally can only obtain below 80% of gross electric capacity efficient; The following D.C. regulated power supply of the particularly extensive 50W that adopts, total efficiency often can only reach 30%～40%; And, if want to obtain big electric current, hang down the output voltage of ripple with aforementioned stabilized voltage supply, also need adopt the large value capacitor of smoothing choke or microfarads up to ten thousand, obviously be uneconomic, and range of regulation also can not be done very widely.The electric power total efficiency of pulse-width modulation switching power supply is high for more preceding two kinds, but the pulse producer that a cover fixed frequency must be arranged, circuit structure is comparatively complicated, cost is also higher, the each ON time of power switch pipe is long, the electrical efficiency of circuit is difficult to surpass 90%, if adopt power transformer again, efficient is just lower.

The purpose of this utility model is to provide a kind of dynamic balance switch type D.C. regulated power supply, it is a kind of voltage-reg-ulator tube of neither using, also without shunt regulator tube, do not need the pulsing circuit of fixed frequency yet, more do not need particular components and complicated circuit just can realize the D.C. regulated power supply that has positive negative output of voltage stabilizing, pressure regulation.

The dynamic balance switch type D.C. regulated power supply of the utility model indication is by the indication gauge outfit on power shell and the panel thereof, pilot lamp, adjusting knob, the input and output wire terminal, electronic circuit in switch and the housing is formed, electronic circuit is by just having the same circuits structure, negative supply constitutes, circuit mainly comprises the sampling element that changes in order to the reflection output voltage, in order to the reference voltage link of standard as a comparison, in order to relatively link is adjusted in the comparing element and the transient equilibrium of output voltage relative datum change in voltage, it is characterized in that, the a end of electrical network input is connected with the commutation diode forward, thereby a terminal voltage makes diode current flow directly enter the positive supply circuit during for positive half-wave; The b end of electrical network input oppositely is connected with commutation diode, thereby the b terminal voltage makes diode current flow directly enter the negative supply circuit when bearing half-wave; Comparing element is by comparer, driving transistors and switching tube are formed, the in-phase input end of comparer connects the reference voltage link, inverting input is with adopting link to connect, the base stage of the output termination driving tube of comparer, the grounded emitter of driving tube, its collector is connected with the base stage of switching tube, the input end that the emitter of switching tube gets access to grid by commutation diode, its current collection is the output terminal of voltage very; The reference voltage link of positive-negative power is made of positive and negative direct supply and variable resistor respectively; Sampling element is made of sampling resistor; The transient equilibrium governing loop is made of the electric capacity that is attempted by on the voltage output end.

The utility model compared with prior art its advantage is: the minimum integrated circuit comparer of employing power consumption is controlled the conducting of power supply switch tube in real time and is ended, thereby guarantee that output voltage presses balance mode and be stabilized on the required numerical value, power supply switch tube can only be according to logical hit of the unsteady wink of output voltage, there is not long conducting heating, loss is minimum, thereby the efficient of whole stabilized voltage supply is high.Owing to can be without transformer directly obtain 0 to 550 volt of DC voltage-stabilizing with interior various magnitudes of voltage from 220 volts or 380 volts of commercial power rectification, voltage adjusting range is extremely wide, output current can be accomplished kiloampere, large value capacitor without smoothing choke and thousands of microfarads, ripple voltage can be controlled in the 6mv, but also soft start, the electric power total efficiency can be up to more than 99%.Be enough to satisfy the request for utilization of all electronic equipments and product, its circuit is very simple again, and the efficient price is than big, thereby very easily promotes the use of and can reach energy savings simultaneously, reduction is to the purpose of the consumption of silicon steel sheet, steel and enameled wire copper material, and society and economic benefit are all big.

A specific embodiment of the present utility model is further provided by accompanying drawing and explanation thereof, wherein:

Accompanying drawing 1 is a circuit structure diagram;

Accompanying drawing 2 is a power supply complete machine structure synoptic diagram.

As shown in Figure 1: this power supply is made up of positive supply circuit of the first half and the negative supply circuit of the latter half.

The a end of electrical network input is connected with the emitter of switch transistor T r3 by the commutating pole pipe D1 that overcurrent, overvoltage protector DW1 are connected with forward; The b end of electrical network input, the commutation diode D2 by reverse connection is connected with the emitter of switch transistor T r4.The reference voltage link of positive and negative power supply is respectively by+12V direct supply, potentiometer W1 and-12V direct supply, potentiometer W2 form; Sampling element is made of R1, R2 and R3, R4 respectively; R1 and R2, the link of R4 and R3 connects the reverse input end of IC1 and IC2 respectively, the other end ground connection of R2, R3, the other end of R3, R4 connects the collector of Tr3 and the collector of Tr4 respectively; Comparing element is respectively by comparer IC1 and IC2, driving tube Tr1 and Tr2 switch transistor T r3 and Tr4, resistance R 5 and R6 form, the in-phase input end of IC1 and IC2 meets W1 and W2 respectively, their output terminal connects the base stage of Tr1 and Tr2 respectively, the emitter grounding of Tr1 and Tr2, their collector connects the base stage of Tr3 and Tr4 respectively, R5 and R6 are attempted by respectively between the base stage and emitter-base bandgap grading of Tr3 and Tr4, output terminal C end and d that the collector of Tr3 and Tr4 is respectively positive and negative power supply hold, between they and ground respectively and be connected to capacitor C 1 and C2; In addition, also be serially connected with reometer A1 and A2 respectively, and be connected to voltage table V3 and V4 and light emitting diode D3 and D4 and their current-limiting resistance R7 and R8.

The principle of work of circuit is an example with the positive supply circuit:

The current potential of sampling spot A floats with the height of output voltage.Close or positive reference voltage does not reach when setting up when power supply is in, the current potential that V1=0, A orders also is zero, and comparer IC1 exports negative voltage positive drive pipe Tr1 and ends, thereby makes power supply switch tube Tr3 end, and has guaranteed the stabilized voltage supply no-output.Along with the foundation of reference voltage, and the very fast A point current potential that surpasses, the output of comparer IC1 is turned into positive voltage immediately, impels the Tr1 saturation conduction, thereby the Tr3 saturation conduction promptly charges to capacitor C 1 by Tr3 through the interchange positive half-wave voltage of diode D1 rectification; C1 plays the transient equilibrium corrective action, and when its voltage rose to certain numerical value, when making the current potential of sampling spot A surpass positive reference voltage V1 number millivolt, the output of comparer IC1 was overturn or negative voltage immediately, impels Tr1 to end; Thereby Tr3 ends, and the voltage of C1 descends immediately, and the current potential that A is ordered also and then descends; When A point current potential drops to when being lower than 1 several millivolt of reference voltage V, the output of comparer IC1 is turned into positive voltage immediately again, from and make Tr1 and Tr3 saturation conduction, repeat said process once more, so go round and begin again, the assurance output voltage (+E) be stabilized on the fixed value; By regulating W1, change the numerical value of reference voltage V 1, the numerical value of output voltage also changes, thereby can assurance obtain any required voltage stabilizing value.

The principle of work of negative supply circuit is the same.

In the present embodiment, comparer employing model is the integrated circuit of LM339 or LM311 etc.Driving tube Tr1 and Tr2 are respectively NPW type and the PNP transistor of withstand voltage 400V, and Tr3 and Tr4 are respectively positive-negative-positive and the NPN type switching tubes of withstand voltage 400V.

The further improvement of this circuit is: resistance R 1 and R3 in the link of will taking a sample change Zener diode into, so that the output ripple voltage of power supply can be controlled in the 8mv exactly; After D1 and D2, respectively add the electric capacity of a 100uf and set up preliminary voltage stabilizing, cross admittance and the too much heating of null value long period up and down at the civil power sine wave to avoid switch transistor T r2, Tr4.

Accompanying drawing 2 is an example of complete machine structure, circuit is positioned at casing, current/voltage gauge outfit A1, A2, V3, V4, diode pilot lamp S1, D2, magnitude of voltage by-pass cock W1, W2, the joint of input/output terminal a, b, c, d and master switch K are located on the panel.

The utility model also can participate in the circuit of each electronic equipment as the power circuit unit except that using as the adjustable direct supply of voltage stabilizing independently.

Claims (1)

1, a kind of dynamic balance switch type DC voltage-stabilizing electric current, its circuit is made of the positive-negative power with same circuits structure, mainly comprises sampling element, the reference voltage link, link is adjusted in comparing element and transient equilibrium, it is characterized in that:

1) comparing element is by comparer, driving transistors, switching tube are formed, the in-phase input end of comparer connects with the reference voltage link, inverting input connects with sampling element, the base stage of the output termination driving tube of comparer, the grounded emitter of driving tube, its collector is connected with the base stage of switching tube, the input end that the emitter of switching tube gets access to grid by commutation diode, its current collection is the output terminal of DC voltage-stabilizing very;

2) the reference voltage link of positive and negative power supply is made of positive and negative direct supply and variable resistor respectively;

3) transient equilibrium adjustment link is made of the electric capacity that is attempted by on the voltage output end.

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