CN87200105U - Continuous power supply unit - Google Patents

Abstract

The utility model introduces a continuous power supply device without switching time. The device, which adopts high frequency compositive technique, is mainly composed of an AC/DC converter (1-2), a PWM voltage regulator (1-3), a slow-starting controller (1-9), a DC/DC isolation direct-current converter (1-4), a DC/AC inverter (1-5), a PWM charger (1-12), a DC/DC voltage-increasing converter (1-8), a controller (1-10) and a storage battery (7). The device has the advantages of no switching time, no noise, an allowed large fluctuation range of alternating current input, stable and reliable single-phase alternating current output, small distortion, and a wide selection range of components. Particularly, after the slow-starting controller is additionally arranged, the device is safer when working.

Description

Continuous power supply unit

The utility model is a kind of electric supply installation, more particularly, relates to a kind of uninterrupted power supply device that does not have switching time.

Along with development of electronic technology, various types of electronic technology are used widely in every field.Simultaneously, also more and more high to the requirement of electric supply installation, except that voltage, frequency, waveform etc. were had relatively high expectations, the device of continuous operation then required power to interrupt greatly.For example, electrical network has a power failure suddenly, with the electronic computer work of turning round is interrupted, perhaps causes the out of control of continuous flow procedure caused major accident; Perhaps make the ventilating system paralysis; Perhaps make the illumination on tunnel, airport and the interruption etc. of navigating, this causes serious even hardly imaginable consequence sometimes.The moment electric oscillation of the fluctuation of line voltage, supply line, the distortion of voltage waveform and the interference of various electrical noises etc. if surpassed the scope that charges and discharge, also can influence the reliable and stable continuous running of visual plant.

In order to satisfy above-mentioned requirements, various uninterruptible power systems (being called for short UPS) arise at the historic moment and are used widely.Such as, the SPR350 of the SuPER NO A12-8050-1 type of U.S. NOVA, the POWERMAKER of TOPAZ and ELGAR has satisfied the requirement of part equipment and instrument.But, because these UPS still exist the problem of switching time or waveform, so dwindled the range of application of UPS greatly.The UPS800 uninterruptible power system of Finland ICA company (" international economy and trade message " 1986.9.14) has overcome above-mentioned shortcoming.The major technique feature of this system is that grid alternating current is become direct current by the AC/DC converter, is transformed into 220 volts, the alternating current supply load of 50HZ through the DC/DC isolated converter again by the DC/AC inverter; When line voltage just often, in powering load, through the AC/DC converter obtain direct current, by the DC/DC converter to battery charging; When line voltage during not enough or outage, batteries via DC/DC converter, DC/DC isolated converter, DC/AC inverter to electric.The result on probation at home of this system shows the normal boot-strap poor reliability.In addition, the electronic devices and components of this product mainly come from Japan, Italy and the U.S..

The purpose of this utility model is to develop a kind of reliability height of starting shooting, wide, the efficient light uninterrupted power supply device of the optional model scope of electronic devices and components.

Major technique design of the present utility model is to adopt the high frequency synthetic technology and between controller and PWM voltage regulator slow starter is set.

Fig. 1 is the theory diagram of the utility model electric supply installation.

Fig. 2 is unit switch element circuit figure.

Fig. 3 is a DC/AC inverter theory diagram.

Fig. 4 is the drive circuit schematic diagram.

Fig. 5 is slow start-up course control circuit schematic diagram.

Embodiment of the present utility model and type of action accompanying drawings are as follows:

As shown in Figure 1, grid alternating current leaches the noise jamming signal by power-supply filter (1-1), (1-2) is transformed into direct current by the AC/DC converter, through PWM voltage regulator (1-3), go into DC/DC isolated converter (1-4), become 220 volts, the alternating current of 50HZ by DC/AC inverter (1-5) again), through output filter (1-6) supply load; When line voltage just often, batteries (1-7) is charged through PWM charger (1-12) from the B point; When line voltage during not enough or outage, batteries (1-7) through DC/DC booster converter (1-8) to the B point, again by (1-3), (1-4), (1-5), (1-6), to electric; The input signal of controller (1-10) is from the B point, (1-4), (1-7) and export control signal control (1-3), (1-4), (1-5), (1-8), alarm (1-11), (1-12), the described DC/AC inverter (1-5) that is characterised in that of the present utility model adopts the high frequency synthetic technology.

As shown in Figure 1, the switch element that said (1-3), (1-4), (1-5), (1-8) adopt power MOS pipe and transistor to combine is operated on off state, and oneself power consumption is very little, makes the high efficiency of this device that the basis arranged.

As shown in Figure 2, said switch element is by power MOS pipe T ₁And T ₃, power switch transistor T ₂And corresponding resistance, electric capacity and diode constitute.Their parameter should be determined according to the magnitude of voltage in country variant and area and the performance number of this device.In order to raise the efficiency, must come the Push And Release of control switch unit reliably with very little power, require to be subjected to high pressure again, high-speed response again, and from present getable device (no matter domestic and international market), it is little that power MOS pipe has power controlling, (being the input impedance height), response is fast, but the characteristics of power little (the conducting electric current is little), and power transistor has power big (the conducting electric current is big), but power controlling big (input impedance is low), the slow characteristics of response speed, the two combines, and can maximize favourable factors and minimize unfavourable ones, and constitutes novel switched unit.

The said DC/AC inverter of Fig. 1 (1-5)

As shown in Figure 3, produce high-frequency pulse signal by high-frequency carrier signal generator (3-1), produce sine wave signal by power frequency component generator (3-5), high-frequency pulse signal is synthesized the pulse train of pulse duration with sinusoidal variations through modulation synthesizer (3-2) by the power frequency component modulation, be input to the input of driver (3-3), driver (3-3) is transformed into the high-voltage pulse sequence of width with sinusoidal variations to the high-voltage direct-current electricity from (1-4) again, (3-4) is demodulated to power-frequency voltage, supply load through demodulator.

The said driver of Fig. 3 (3-3) as shown in Figure 4, K wherein ₁-K ₄Be the unit switch unit.K ₂And K ₃During conducting, K ₁And K ₄Just end, vice versa.K ₂And K ₃Control end be N ', K ₁And K ₄Control end be N, the signal of N and N ' is from Fig. 3 (3-2), (3-4) that M and M ' output to Fig. 3 just obtains power-frequency voltage after demodulation.Voltage source E is equivalent to the high direct voltage from (1-4).And K wherein ₁-K ₄All be operated on off state, self merit is ploughed very little, thereby lays a good foundation for high efficiency.Simultaneously, owing to have the commutation effect, just removed heavy Industrial Frequency Transformer, alleviated the weight of this device, dwindled its volume, this is one of major advantage of high frequency synthetic technology.

As shown in Figure 1, slow starter (1-9) is set at (1-3) with (1-10).

As shown in Figure 5, described slow start-up course control circuit constitutes by (1-3), (1-4) with (1-9), and wherein (1-3) is by unit switch unit K ₅, inductance L ₁, electrolysis C ₁With diode D ₁Constitute the tandem tap power supply; Sampling transformer B ₂, full-bridge rectifier D ₃～D ₆And pulse-width modulator PWM constitutes sampling regulating circuit road.Wherein (1-4) is by two groups of unit switch unit K ₆And K ₇Constitute and recommend power circuit and high frequency transformer B ₁With full-bridge rectification D ₇～D ₁₀Constitute.Described slow start-up control device (1-9) is by voltage comparator ic ₁, the equivalence AND gate IC ₂, D ₂And by R and C ₂The RC circuit of forming constitutes.When starting, be added in the Y point from the high level of (1-10), electric current through resistance R to capacitor C ₂Charging.Z point voltage U _Z=U _Y(1- ^-t/RC), U wherein _YThe high level of ordering for Y is U _ZBe input to IC ₁"+" end, simultaneously the sawtooth waveforms that is produced by controller (1-10) is added in IC at the X point ₁"-" end, at IC ₁Output just to obtain pulsewidth be τ=τ ₀U _Z/ U _X(U _Z≤ U _X) pulse train, τ wherein ₀Be similar to sawtooth wave period, U _XAmplitude for sawtooth waveforms.During startup, U _ZVoltage raise gradually, the pulse duration of output increases gradually thereupon.After slow start-up course finishes, output voltage U _ZBe high level.U ₄Be U ₂And U ₃Coincidence AND signal, the pulse sequence was broadened gradually by narrow when this had just guaranteed startup, and the time that changes can be by regulating R and C ₂Come to determine, thereby guaranteed that the unit switch unit does not have the overvoltage phenomenon that reliability when having guaranteed that this machine starts has enlarged the optional scope of components and parts.

The rationale that slow start-up control device (1-9) is set is: the high pressure that B is ordered (200-350 volt) adds to high frequency transformer B through the tandem tap power supply ₁The centre cap of input.By the formula of tandem tap power supply as can be known, input voltage U ₁And output voltage U ₀The pass be: U ₀=U ₁δ, wherein, δ=Ton/T(Ton is the ON time of unit switch unit, T is the cycle of pulse).Start promptly is added in the voltage V＞2U on assembled unit _o=2U _i=400～700 volts, the highest withstand voltage of power MOS pipe (TP4N50) that the unit switch unit adopts is 500 volts, so the moment of start can be breakdown.After adopting described slow start-up control circuit, (1-9) middle IC ₁Output pulse train and described sampling adjustable ring output signal, by " with " relation after add to K ₅Control end, in when start, pulse is very narrow, K ₅ON time Ton very little, δ=Ton/T is just very little, so U _o=U _iδ is just very little; After this machine entered stable state, the sampling voltage of described sampling regulation loop was just recovered its control precision and response speed after setting up.

This electric supply installation can be used for microcomputer, office automation, cash register and distribution point system, research equipment, constabulary's Vomitory control and logging system, data network, electronically controlled bank and telephone plant etc.

This application of installation shows in the test result of microcomputer and other equipment, this device no switching time, there is not irksome noise during operation, input ac voltage can be 198～242 volts, and frequency can be 45～440HZ, and instantaneous peak power of bearing is 2KW in the 50HZ one-period, energy conversion efficiency is more than 80%, the stability of output voltage is 220 volts ± 2%, and frequency stability is 50HZ ± 0.005%, and the distortion factor is less than 5%(THD). In addition, can select domestic and international various components and parts to replace mutually, not only not affect the reliable and stable of complete machine, and installation, maintenance, easy to use, volume is little, and is in light weight, is easy to carry. After particularly employing started control circuit slowly, it was very safe and reliable to start shooting.

Claims (1)

1, a kind of uninterrupted power supply device, it comprises: grid alternating current is transformed into direct current by power-supply filter (1-1) by AC/DC converter (1-2), go into DC/DC isolated converter (1-4) through PWM voltage regulator (1-3), become 220 volts, the alternating current of 50HZ through output filter (1-6) supply load by DC/AC inverter (1-5) again; When line voltage just often, batteries (1-7) is charged through PWM charger (1-12) from the B point; When line voltage during not enough or outage, batteries (1-7) through DC/DC booster converter (1-8) to the B point, again by (1-3), (1-4), (1-5), (1-6) to electric; The input signal of controller (1-10) is from the B point, (1-4), (1-7) And output control signal control (1-3), (1-4), (1-5), (1-8), (1-11), (1-12), said inverter (1-5) produces high-frequency pulse signal by high-frequency carrier signal generator (3-1), produce sine wave signal by power frequency modulation signal generator (3-4), high-frequency pulse signal is synthesized pulse duration is input to driver (3-3) with the pulse train of sine wave variation input through modulation synthesizer (3-2) by the power frequency component modulation, driver (3-3) is transformed into the high-voltage pulse of width with sinusoidal variations to high voltage direct current again, (3-1) is demodulated to the power-frequency voltage supply load through demodulator, the utility model feature is at (1-3), slow starter (1-9) is set (1-10), and described slow start-up course control circuit is by (1-3), (1-4) and (1-9) constitute;

-(1-3) by unit switch unit K ₅, inductance L ₁, electrochemical capacitor C ₁With diode D ₁Constitute the tandem tap power supply, sampling transformer B ₂, full-bridge rectifier D ₃～D ₆And the sampling regulating circuit that pulse-width modulator PWM forms constitutes;

-(1-4) by two groups of unit switch unit K ₆And K ₇Constitute and recommend power circuit and high frequency transformer B ₁With full-bridge rectification D ₇-D ₁₀Constitute;

-(1-9) by voltage comparator ic ₁, the equivalence AND gate IC ₂, D ₂And by R and C ₂The RC circuit of forming constitutes;

During startup, be added in the Y point from the high level of (1-10), electric current charges to capacitor C through resistance R, Z point voltage U _Z=U _Y(1-e ^-t/RC), U wherein _YThe high level of ordering for Y is U _ZBe input to IC ₁"+" end, simultaneously the sawtooth waveforms that is produced by controller (1-10) is added in IC at the X point ₁"-" end, at IC ₁Output obtain pulsewidth be τ= ₀(UZ)/(UX) (U _Z≤ U _x) pulse train, τ wherein ₀Be similar to sawtooth wave period, U _XBe the amplitude of sawtooth waveforms, during startup, U _ZVoltage raise gradually, the pulse duration of output also increases gradually thereupon, after slow start-up course finishes, output voltage U ₃Be high level, U ₄Be U ₂And U ₃Coincidence AND signal.

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