CN2131238Y - In-line uninterrupted power - Google Patents

Abstract

The utility model relates to an in-line uninterrupted power, comprising a cabinet, a battery group, AC and DC conversion and control circuits, wherein, a PWA integrated device is adopted as an oscillation source in the three circuits of ac/dc rectification transform, dc/dc voltage boosting transform and dc/ac inversion; the reference edge of the pulse-width modulation integrated chip of the ac/dc and dc/dc transforms are respectively provided with an exponential curve type soft start-up circuit; the ac/dc transform is also provided with a new circuit with dual isolation shape driving power VMOS tube.

Description

In-line uninterrupted power

The utility model relates to a kind of solid state UPS, and particularly a kind of novel online uninterrupted power supply belongs to power technique fields.

Development along with communication, computer and various intelligentized electronic instrument equipment, requirement can be safely, long-term continuous operation reliably, become the demand of domestic many industries with power-supply device that regulated output voltage is provided or device, so, the solid-state electronic formula uninterrupted power supply that various watt levels differ just arises at the historic moment, and obtains increasingly extensive market.At present, modern power supply should possess premium properties such as high frequency, efficient, energy-conservation and quick, reliable, purification, voltage stabilizing, frequency stabilization, and the power supply with these good characteristics is listed in one of key popularized project by country.But owing to be subjected to the restriction (for example theoretical level, material behavior, components and parts supply and craftwork manufacture ability or the like) of various reasons, domestic does not still have a real own high-performance uninterrupted power supply (ups) Unity that designs production.Now " homemade " UPS that sells on the market is most from " company " and so on small enterprise, and be to adopt import parts in addition mostly, produces a lot of defective of its performance by the foreign method assembling.

The purpose of this utility model provides a kind of novel online uninterrupted power supply, and it is based on modernized power supply theory, utilizes the microelectronic component of the international middle and later periods eighties and the high-performance UPS of less expensive material.

The utility model is achieved in that it is by cabinet, batteries and AC, DC conversion and control circuit etc. are partly formed, wherein the control circuit of complete machine includes input low pass filter 1, two isolated form AC/DC rectifier converters 2, batteries 3, central controller 5, DC/DC booster converter 6, DC/AC inverter 7 and output low pass filter 8(are referring to Fig. 1), wherein AC/DC conversion, three circuit of DC/DC conversion and DC/AC conversion all adopt pulse-width modulation (PWM) integrated device as source oscillation signal, are respectively arranged with exponential curve soft starting circuit at the reference edge of the pulse-width modulation integrated chip of AC/DC conversion and DC/DC conversion.Wherein two links of DC/DC, DC/AC have constituted the high-efficiency inversion device.

Non-on line type UPS is by the relay change action, and when mains failure, its switching motion and start-up time are all longer, so the gesture that becomes superseded.No matter have or not civil power, it is in service that the storage battery of on line type UPS and inverter all are in work: when civil power was arranged, storage battery was " floating charge " state, and it is standby that inverter then is in " hot ", behind the mains failure, just can be powered by it, did not have change-over time at once.But common on line type UPS efficient has only 90%, the utility model is owing to adopted the new technology (number of patent application: CN92109533.3) of two isolation shaping rear drive power VMOS tubes, efficient height, saving energy, each element heating amount greatly reduces, after removing axial flow blower employing natural draft, temperature rise is still very low in the machine.(number of patent application: CN92109532.5), can not produce current surge when making start and impact, to work more safe and reliable to have adopted recently the logarithmic curve soft start circuit of the Switching Power Supply of development again.The utility model has been used the current advanced person's that the applicant succeeds in developing control technology and device, and overall efficiency is reached more than 96%, and operating frequency can reach 100KHz, and power is 2KVA.In a word, the utility model is to rely on the independent novel online uninterrupted power supply of developing with multinomial technical characteristic of Chinese oneself fully.

Below in conjunction with accompanying drawing, specifically introduce the utility model.

Fig. 1 is a complete machine control circuit block diagram of the present utility model.

Fig. 2 is two isolated form AC/DC converter circuit block diagrams.

Fig. 3 is the central controller block diagram.

Fig. 4 is DC/DC transposer block figure.

Fig. 5 is a DC/AC full-bridge circuit schematic diagram.

Shown in Figure 1 is the utility model circuitry block diagram.When mains-supplied, alternating current (220V ± 20%) supplies batteries 3 chargings and inverter circuit DC/DC booster converter 6, DC/AC converter 7 as power supply through the direct current of AC/DC converter 2 rectifications becoming 54～56V.Batteries 3 is energy-storage travelling wave tubes, in case powered to the load by it behind the mains failure, then is in " floating charge " state of stand-by heat at ordinary times.Central control circuit 5 is responsible for the operating state of a plurality of circuit of complete machine is detected, controls and send corresponding acousto-optic indication.DC/DC converter 6 is that 48 volts of direct currents of 55 volts of direct currents that the commercial power rectification is gone out or batteries 3 boost is 331 volts direct current, and for DC/AC converter 7 its 311 volts of dc inverters is become industrial-frequency alternating current under the condition of power-limiting output.(square wave or sine wave) again through the high-frequency signal of low pass filter 8 elimination remnants, is industrial-frequency alternating current that 220 volts voltage is outwards exported with effective value, the 4th, and the LC filter circuit.

Fig. 2 has showed the composition of two isolated form AC/DC converters 2: include rectifying and wave-filtering 20, high frequency full-bridge type switch 21, control circuit power supply 22, PWM1 and its exponential soft starting circuit 26, two buffer circuit 24, high-frequency power transformer T2 and high-frequency rectification circuit 25.

The operation principle of this part is divided into two parts: the one, and power channels: earlier after the civil power current limliting, set up 311 volts of voltages to filter circuit 20 chargings, this voltage is again through high frequency full-bridge type switch 21 and high-frequency power transformer T2, by high-frequency rectification circuit 25 rectifications, filtering, set up the direct voltage about 55 volts.For guaranteeing the stable of this voltage, the direct voltage of output is reduced to 2.25 volts and is fed back to PWM1 as conditioning signal after resistance R c, Rd series connection dividing potential drop.Another is the control signal passage: provide direct current 18 volts of power supplys by control circuit power supply 22 to PWM1, PWM1 is as oscillation source, produce the pulse-width modulation square wave, earlier through one by semiconductor, the full-bridge buffer circuit 24A that triode is formed, PWM and inductive load transformer TO are kept apart, after making the PWM1 output waveform idealized, just insert high-low pressure isolating device TO, again to wave form varies through transformer TO transmission back generation, level is provided with four by the inverter that has the source door secondarily, the shaping circuit 24B that voltage comparator and totem mode drive circuit are formed, it is shaped to ideal square wave, reaches every power tube of high frequency full-bridge respectively.This " two isolation, plastic drive circuit " is one of technical characteristic of this machine, applied for patent of invention (number of patent application is CN92109533.3), when driving the high-power V metal-oxide-semiconductor, its waveform rising edge is 10～20nS, trailing edge be 20～40nS(tradition isolation drive method both be respectively 0.8～1.2 μ S and 2～3 μ S), make switching power tube avoid simulation transitional period in the pwm signal waveform fully, the pipe consumption descends tens of times, both avoided heating, save energy again, efficient is greatly improved.For avoiding the moment generation short-circuit impact electric current of starting shooting, the utility model has adopted the reference edge at PWM1 to be provided with one and has powered up its voltage of back soft starting circuit 26 of rising of rule exponentially, this is an another technical characteristic of the present utility model, has also applied for patent of invention.This circuit design novelty, the simple structure practicality, the exponential form start that can realize 3～5 seconds starts slowly, has protected the safety of power supply itself effectively.

UPS selects for use batteries as energy-storage travelling wave tube usually, and this machine is no exception.The voltage fluctuation signal of batteries 3 is sent into the signal of central control circuit 5 and is differentiated that A is to detect the electric energy reserves behind LC filter circuit 4 by resistance R a, Rb dividing potential drop.Another input signal of central control circuit 5 is the mains failure signal, in case mains failure, this signal is delivered to signal and is differentiated B, triggers to control No. 12 oscillators in 4 seconds behind the delay circuit again and send rhythm 12 audio frequency signals faster, points out people to enter the operating state that storage battery is kept inversion.At this moment, above-mentioned signal differentiates that A constantly monitors the state of the art of storage battery, when its voltage drops to 90%, drive " discharged or defective battery " display lamp L1 and drive 4 seconds delayers and 5 fens delayers, make audio oscillation send rhythm slower reach 5 minutes alarm sound, and when 5 minutes stop the signal A of a startup trigger of output, automatically shut down the DC/DC converter.4 seconds delayers here are signal delay after 4 seconds, again " with " (refer to " logical AND "-be illustrated as " Y ") original signal comes along and start 5 fens delay circuits.This is in order to improve antijamming capability, to prevent the misoperation that accumulator internal resistance brings, improving the circuit working reliability.When battery tension reduced to 85%, control circuit 5 also can be lighted serious power shortage display lamp L2 and send control signal B and drive the trigger upset immediately, stops the work of DC/DC converter.For the mains failure signal, also taked to postpone after four seconds, again " with " (logical) former power cut signal comes along the interference protection measure that starts 12 audio oscillator circuits.

DC/DC booster converter 6 is made up of trigger 60, PWM2, exponential signal source 61, full-bridge switch 62, high frequency transformer T3 and rectifier filter circuit 63, its function is 48 volts of direct voltages that 55 volts that civil power is transformed into or storage battery are confessed, boost into 311 volts direct current, and under the condition of restriction power output, for DC/AC translation circuit use thereafter.The method of power-limiting is after the current signal of full-bridge switch 62 is taken out conversion, delivers to the input C of trigger 60, when power exceeds, and the trigger upset, the output high level directly stops the work of PWM2 and PWM3, closes output, protects the safety of power supply.The PWM2 has here also used logarithmic curve soft start circuit, and function and characteristics are with above-mentioned.

DC/AC converter 7 is formed full-bridge circuit by four high power transistor V1～V4, the method that adopts controlled rectification principle and symmetrical conducting to end, and it is 311 volts ac square wave that the DC311 volt is reverse into peak value, its circuit diagram is referring to Fig. 5.Wherein 71,72 is input, its control signal is from two outputs of the PWM3 that works in power frequency, 73,74 is output, capacitor C and resistance R 5 are the absorption network of load feedback harmonic wave, prevent the perceptual harmonic wave high-voltage breakdown V1 and the V2 of load, V1～V4 forms master switch pipe, the cut-off state of V1～V4 when R1～R4 guarantees no signal respectively, unlikely damage PWM3 device when diode D1, D2 then are used to prevent to scurry into high pressure.The course of work of this circuit is when 71 end input high levels, 72 end input low levels.The high level of 71 ends makes the V1 conducting through D1, R6, and makes also conducting simultaneously of V3 through change-over circuit 75; This moment, the low level of 72 ends ended V2, V4 through R2, R4 effect, the 73 ends output high level of whole electric bridge, and 74 end output low levels, and keep about 7 milliseconds of times, entering the dead band of PWM3 afterwards, V1～V4 all ends, and finishes the work of positive half cycle.73 end output low levels when negative half period, 74 ends output high level is also kept about 7 milliseconds of times, and the course of work is just in time opposite with positive half cycle.So the result of alternation makes DC/AC inverter 7 constantly send Vp=311 volt, the ac square wave of V=220V.

The utility model has been made experimental prototype, the result that test is implemented show its can finely finish online fast, safety switches power supply, output voltage stabilization degree good (≤4%) frequency stability surpasses 0.1%, and output voltage and frequency can not change because of load variations, moreover, overall efficiency height, less energy consumption, can keep the interchange output that reaches a few hours behind mains failure, be a kind of desirable uninterrupted power supply.

Claims (3)

1, a kind of novel online uninterrupted power supply, be by cabinet, batteries, AC, DC conversion and control circuit etc. are partly formed, it is characterized in that: the control circuit of complete machine includes low pass filter 1, two isolated form AC/DC rectifier converters 2, batteries 3, central controller 5, DC/DC booster converter 6, DC/AC inverter 7 and low pass filter 8, wherein the AC/DC rectifier converter 2, all adopt pulse-width modulation (PWM) integrated device as source oscillation signal in 7 three circuit of DC/DC booster converter 6 and DC/AC inverter, be respectively arranged with logarithmic curve soft start circuit at the reference edge of the pulse-width modulation integrated chip of AC/DC conversion and DC/DC conversion.

2, uninterrupted power supply as claimed in claim 1 is characterized in that: two isolation, plastic drive circuit are housed in AC/DC rectifier converter 2.

3, uninterrupted power supply as claimed in claim 1, it is characterized in that: in the central controller circuit, all adopt for input signal (mains failure signal or battery tension signal) it is postponed after 4 seconds again " with " ［ logical ］ original signal triggers and start the next stage circuit, to improve its antijamming capability.

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