RU1835119C - Multichannel source of stabilized voltage - Google Patents

Abstract

Use: Converting a constant voltage to a constant voltage. The inventive voltage source contains two elements And (7), the master oscillator (A), a trigger divider for two (6), a one-shot (5), a push-pull cascade of power transistors (12), a power transformer (13), N output channels, each of which consists of a series-connected rectifier and an output filter, a feedback block (10) and a protective diode (H). A smoothing filter (2), two powerful inverters (8), a control transformer (9) and a parametric voltage stabilizer (3) were introduced, which increase the stability of the output voltage and the reliability of the power source. 1 C.p. f-ls, 5 ill.

Description

The present invention relates to electrical engineering, in particular to devices for converting a constant voltage to a constant voltage of various sizes, and can be used in secondary power supplies of automation units, computer equipment, communications, alarm systems, etc. where galvanic isolation is required for nutrition.

The aim of the invention is to increase stability and reliability (while expanding the functionality due to the formation of several stabilized output voltages).

Fig. 1 is a functional diagram of the proposed multi-channel stabilized voltage source; on f1; d. 2 is an embodiment of a parametric voltage stabilizer circuit; in FIG. 3 is a circuit diagram of a node for forming a multi-channel stabilized voltage source (including a master oscillator, a one-shot oscillator, a two-stage trigger divider, shapers, AND elements, and powerful inverters); in FIG. 4 is a variant of a prin, 1-way electrical circuit unit, feedback; in FIG. 5 is a timing diagram illustrating the operation of a multi-channel stabilized voltage source.

The multi-channel stabilized voltage source contains a protective diode 1, an input smoothing filter 2, a parametric voltage stabilizer 3, a master oscillator 4, a single-shot 5, a trigger divider for two 6, two elements

L

1r-J

/ 7 and 7, a powerful inverter 8, a control transformer 9, a feedback block (BOC) 10, a smoothing filter 11, a two-stroke cascade 12 of power transistors, a power transformer 13, a half-wave rectifier 14 with a mid-point, a bridge pulse rectifier 15, unipolar output filter 16 and bipolar output filter 17.

The protective diode 1, the input of which is the input of the source, is connected by the output through the input smoothing filter 2 to the input of the smoothing filter 11 and to the input of the НсErametric voltage stabilizer 3, the output of which is connected to the outputs of the lead of the master oscillator 4, single-vibration piT: cpa 5., trigger 6, elements And 71 and 7, powerful inverters 81 and 82 and BOS 10.

The output of the master oscillator 4 is connected to the input of a single-vibration input connected to the output of the trigger divider by two 6 and the second output to the input inputs of both elements

Comrade} G and Y-. The trigger divider for two 6 is connected by i iHereverny and direct outputs- (... to the second inputs, respectively, of the first bOfo 7 and the second 72 AND elements, the outputs of which are connected, respectively, through the first B1 and the second 8 powerful inverters ;; to the corresponding conclusions of the primary winding of the control transformer 9, connected by the output winding to the input (dbm of transistors) of the push-pull cascade of 12 power transistors, the output of which is: connected to the input winding of the power transformer 13, connected by the middle one to the output of the smoothing f; 11. Per and the output winding of the power supply is B ..; the transformer 13 is connected through series-connected two-half rectifier 14 with a midpoint and two unipolar output filters 16 i; 16 to the input of BOS10, the second output is ob-; the transformer 13 of the power transformer ( In the general case of such windings, N) can be connected to the output channel of the bipolar voltage, consisting of a series-connected bridge pulse rectifier 15 and output LC filters 171 and 172. The output of BOS10 is connected to the control (frequency-setting) single-inlet input 5.

The parametric voltage stabilizer 3 contains (Fig. 2) a current source 18, a reference element 19 in the form of a zener diode and a composite adjustable transistor 20 connected to the output of the current source 18. The input of the current source 18 is the input of the parametric voltage stabilizer J, the output of which is the output of the composite adjustable transistor 20.

In FIG. 3 shows a variant of a circuit diagram of a forming unit, consisting of a master oscillator 4, a single-vibrator 5, a trigger divider for two b, a pulse shaper in the form of three inverters Tch; T2 and T3 (not indicated by digital numbers in Fig. 3), two elements And 7 and 7 and two powerful inverters 81 and 82,

The feedback unit (BOC) 10 contains (Fig. 4) a series-connected current amplifier 121, a transistor optocoupler 5 22, a low-pass filter (LPF) 23R-MOS transistor 24 in an adjustable resistance mode. The input of the amplified current 21 is the input of the BOC 10, the output of which is the output of the P-MOS transistor 24. 0 In FIG. Figure 5 shows the timing diagrams of the signals at the output of the blocks of a multi-channel stabilized voltage source for the cases of minimum input voltage UBx min and maximum 5 input voltage UBx max. In FIG. 5 the following notation is accepted:

pos. 25 - output voltage of the master oscillator 4;

pos. 26 - output voltage single-0 vibrator 5;

pos. 27 - voltage at the output windings of the control transformer 9;

pos. 28 — voltage at the outputs of the push-pull cascade of 12 power transistors; 5 poses 29 — output voltage of a half-wave rectifier 14 with a midpoint;

pos. 30 - output voltage of a unipolar output LC filter 16 (shaded in FIG. 5 0);

UBX min minimum input voltage;

UBX max - maximum input voltage;

5 Ueuxl unipolar output voltage;

Tg is the period of the master oscillator 4;

to в - duration of pulses of a single vibrator 5;

0 tn conversion pulse width;

UB us - voltage between the base and the emitter of the power transistor in saturation mode;

5 Uke us - voltage between the collector and the emitter of the power transistor in saturation mode.

A multi-channel stabilized voltage source operates as follows. Input voltage through

the protective diode 1 and the input smoothing LC filter are connected in series to the input of the parametric voltage stabilizer 3 supplying the master oscillator 4, one-shot 5. trigger divider into two 6, both I7 and 7 elements, both powerful inverters 8 and 8 and BOS 10 .

The master oscillator 4 generates a continuous train of pulses (Fig. 5, pos. 25) with a frequency of fr 25 kHz ± 10%. Each pulse from the output of the master oscillator 4 by the leading edge triggers a single-vibration jur 5. The pulse duration at the output of which (Fig. 5. pos. 26) depends on the voltage from the output of feedback block 10, but does not exceed the permissible value (to in T g )

The pulses from the output of one vibrator 5 are fed to the input of a trigger divider into two 6, which distributes them among the clock cycles. The pulses from the inverse and direct outputs of the trigger-divider for two 6 are supplied to the same outputs of the elements And 7 and 7, the pulses from the outputs of which are inverted in the powerful inverters 81 m 8 h are fed to the input winding of the control transformer 9, which is connected in a given sequence to tires + ipit.stzb. and - ip.stab. (Fig. 5, pos. 27) and, thus, controls the input winding of the power transformer 13 with transistors of the push-pull stage 12 (Fig. 5, pos. 2-8).

From the output windings of the power transformer 13, the voltage is rectified in rectifiers 14 and 15 (Fig. 5, pos. 29) and is filtered by filters 161. 16L. 171 and M1 (FIG. 5, POS. 30). The voltage from the output of the second output filter 16 is fed to the input of the BOC 10, in which it is amplified in the amplifier 21 and filtered in the low-pass filter 23. The voltage from the output of the low-pass filter 23 controls the P-MOS transistor 24, connected in parallel with the time resistor specifying the RC circuit of the one-shot 5 (Fig. 3). in this case, the duration of the output pulse of the one-shot 5 is controlled.

The higher the voltage at the input of the feedback unit 10, the larger the signal at its output, the longer the pulse duration at the output of the one-shot 5 and the shorter the duration of the control pulse at the output of the control transformer 9.

The amplitude and duration of the pulse of the transformations ani on the output windings of the power transformer 13 linearly depends on the input voltage, and the larger the input voltage, the greater the amplitude and shorter the duration of the conversion pulse, while the voltage at the load remains constant.

With an increase in the input voltage, on the one hand, an increase in switching losses of the push-pull cascade of 12 power transistors occurs, as well. on the other hand, there is also an increase in the pause duration tn, i.e., the disconnected state of the push-pull cascade of 12 power transistors, which contributes to the thermal stability of the output parameters of the stabilized voltage source. The size and stability of the output; e and it is ensured with the following characteristics: negative negative SRHR voltage at the output of block 10, that is, the choice of the operating point of the P-MOS transistor 24 (Fig. 4) operating in the control mode resistance connected in parallel to the resistor during the timing of the RC circuit of the single-shot 5. Using the invention allows to increase the stability of the output voltage and the reliability of the power due to the following features of the proposed technical solution:

-the power supply of the main forming blocks of the device (blocks 4-8) is provided by a stable voltage from the output of the parametric voltage stabilizer 3;

- one single vibrator 5 is used in the prototype; two single vibrators for generating control pulses, which ensures full symmetry of the output bipolar voltage;

-controlling the duration of a single vibrator 5 in terms of voltage from the output of one output channel with maximum consumption ensures voltage stability of all output channels (at constant load):

- the flow of through currents is excluded:

-the mode of carrier resorption and locking of power transistors is used with negative negative voltage,; /; with the possibility of self-induction EMF in the input winding of the control transformer;

-the possibility of manufacturing an electronic unit in the form of an integrated circuit and, in this case, significantly reducing its mass-dimensional parameters.

At the factory, 15 prototypes of the power source were manufactured, tests of which showed that the instability of the output voltage along the first output channel (from which the feedback signal is taken) exceeds

.r (), 03% (± 3 mV) and other output channels + 0.06% (+4.5 mV).

The implementation of the invention is planned in the factory for the period from 1992-1993.

Claims (2)

The formula is invented and 1. A multichannel source of stabilized voltage, containing an input filter, two elements I. A generator, a trigger divider, two, one-shot, two-stroke short circuit power transistor, power 7 rank zoom. M output channels, each of which consists of sequentially created g-carriers and an output Filter), a feedback unit and a protective diode, the input of which is the input of the source. guedso dinnenml output to a suitable pass smoothing fpptoa. outputs / ;; /; :: t o go kpokzdz power transisto s. - ::.: 1 i-. with the initial and final you: K: D; - And: iX.O: .. Jl i O b M O T K. AND POWER . V- iTcrjr, the output winding of which is about oh. ; ../ ,. :: g: hbi-x COOT : -.; -...:: - ;. , -h-.d filter leorogo of which ;; o.a-; oji; - x r.-go of the feedback block, m: .-. tx OD -:; - :::; but} exit to the right ow young: 0: lbri horp. about l and h p yu 1D and s, s, s; ol: C g; ov-y; .1: non-stdO / lnosl to low hardness (npi / i p -: stitching functional DOSMOxiiOGTen due to gormiropani ок n;; sbixoznibix ntp: z: -: ı), about it:; Y: е-:: we have the filter, two powerful lumens; р: rtirz, transformer format control and a parametric voltage stabilizer connected by an input to the output of the input smoothing Filter and to the input of the smoothing filter and the output to the power supply circuits of a single-shot, both elements of And, a trigger divider by yes, both powerful inverters, a feedback unit and a reference generator, the output of which connected to. information input of a single vibrator connected by an inverse output to one of the outputs of both AND elements and a direct output to a counting input of a divider trigger into two, whose inverse and first outputs are connected to other inputs, respectively, of the first to the second I. elements connected to the outputs to the inputs of the first and fifth powerful inverters, respectively, the outputs of which are connected to the input control windings of the transFormotoz control, connected by the output winding to the inputs of the push-pull cascade of power transistors, and the output is smooth the filter is connected to the middle input of the input winding of the power transformer. 2. The voltage source according to claim 1, on the contrary, and so on. what, ; The feedback unit contains a current amplifier, TRZPSL-k. second optical coupler, a filter and their frequencies P-MOS transistor to the resistance control mode, the output of which is - :: & ... I; „.Li-„ „ / # 7 i s; -i ---- i f -; .. ™ i g i „:::. r, f j - “- - it“ - v “ ..- r "-.-..- J., .., (1.). , -. j.) V; -V ,, / L,., j ..-.-.-. r.L..Ji "" I S AND I I i i {//.4 11 |., E j , j Г i ji - u - J i 1 н; .-. i  J // Y // - y W0 Ijfiiiiffuralli I. „„ „.} ..; fy., if. „. J j j, 4 ... J. S i G t:; g; 1. "./Yy-h. -d,, v,; - -, /,  w. .- i. ..., w .. -,. (,. pv .. ".. .- ,,; - ffffA,; ,, Mfe b 25 About UBS. Aliyah. JpUpJp ILJ JILI t its. carried 2 „J 3 & .aGy .. lUZH.K €.   G P ™ G ° кп7ЦЦЦжжЦ- -fcacrsfL.-LC & SK | & зсл „„ Лс2 Л „ la  . R | P $ & Ј ... | Y "hl-g-, A . - 77/7  M  Ks & nzf t, Ј Fi & 5