CN2318664Y

CN2318664Y - All-electric purification type AC. voltage regulator for household

Info

Publication number: CN2318664Y
Application number: CN 97241932
Authority: CN
Inventors: 单觉初
Original assignee: Individual
Current assignee: Individual
Priority date: 1997-10-17
Filing date: 1997-10-17
Publication date: 1999-05-12
Anticipated expiration: 2007-10-17

Abstract

The utility model relates to a novel alternating current stabilizer which is suitable for families and adopts an adjustable inductance type main adjusting loop. A control section is composed of a sampling circuit for feedback voltage effective values, a voltage difference amplifier, etc. The traditional idea that a transformer and a reactor in an adjusting loop of a purified power supply must be linear inductance for a long term is broken through. Under the premise of satisfying the technical indexes applied in families and general industries, the advantages of high precision, fast response, continuous modulation, interference resistance, high reliability, etc. of the technology of the purified power supply are maintained. Moreover, the utility model has the novel characteristics of light weight, small size and low cost and can also be directly started with full load.

Description

Family expenses full-electronic purification type AC voltage regulator

The utility model relates to a kind of supply unit that is suitable for the stable alternating voltage of family expenses.

Existing commonly used family expenses AC voltage regulator product mainly contains two kinds of servo-type and relay systems.The voltage regulation function of servo-type stabilized voltage supply is to realize with the relative position of Transformer Winding by regulating carbon brush.Its subject matter is that response speed is very slow, and sudden high voltage surge is suppressed poor ability, has the wearing and tearing of carbon brush and electromechanics in addition, requires personnel's periodic maintenance.Another kind of relay system is realized regulated output voltage with on-off element switching transformer tapping, and there is the problem of voltage jump in it.The actual repeat circuit that uses easily breaks down, particularly contact adhesion during output short-circuit.Family expenses regulator products repair rate is very high at present, and improving reliability of products is problem anxious to be solved.

The ac purification power supply of using sinusoidal energy distribution technology adopts the static main controlling element of full-electronic.Tool series advantage is widely used at industrial circle in recent years.Yet existing power conditioner product is not suitable for family expenses, and volume is big, Heavy Weight, cost an arm and a leg the starting under load of following energy.And indexs such as degree of stability, additional waveform distortion are too to waste concerning family expenses.

The purpose of this utility model is: the relevant technologies of utilization and transformation power conditioner, design a kind of performance index and meet family expenses, the novel AC voltage regulator product that volume is little, in light weight, cost is low, reliability is very high.

The utility model is achieved in that at one by the whole loop 1 of controlled inductance formula homophony, the saw-toothed wave generator 2 synchronous with power supply, pulse-length modulation (PWM) circuit 3, in the full-electronic purification type AC voltage regulator that feedback voltage error amplifier 4 is formed, the whole loop 1 of controlled inductance formula homophony is by autotransformer B1, reactor L, bidirectional triode thyristor SCR and capacitor C1, C2, C3 forms, the tap of the autotransformer B1 input end that gets access to grid, autotransformer winding N1 termination exchanges output, winding N2 end is connected with reactor L, the L other end is connected with bidirectional triode thyristor SCR anode, the SCR negative electrode connects zero-power line, capacitor C 1 is connected in parallel on L and SCR series arm two ends, capacitor C 2 is connected in parallel on the B1 two ends, and capacitor C 3 is connected on and exchanges between output phase line and the zero line; Feedback voltage error amplifying circuit 4 is by voltage effective value sampling loop 41 in the device, voltage reference loop 42, differential voltage amplifier 43 are formed, the output terminal in the whole loop 1 of the input termination controlled inductance formula homophony of voltage effective value sampling loop 41, its output termination differential voltage amplifier 43 in-phase input ends, the inverting input of differential voltage amplifier 43 connects the reference voltage output end in voltage reference loop 42, the inverting input of the amplifier 33 in output termination pulse-length modulation (PWM) circuit of differential voltage amplifier 43.

Describe in detail with reference to the accompanying drawings.

Fig. 1 is a system block diagram of the present utility model.

Fig. 2 is a circuit diagram of the present utility model.

When voltage stabilizer is exported because of electrical network input or load change, voltage effective value sampling loop 41 will produce and the corresponding direct-current control voltage of output voltage (effective value).Differential voltage amplifier 43 subtracts each other this voltage and base and draws difference voltage and award amplification as voltage, the sawtooth wave acting in conjunction of and synchronized that send with saw-toothed wave generator 2 is in pulse-length modulation (PWM) circuit 3, the size of the conducting angle of SCR in its output control homophony loop, thereby the equivalent electric sensibility reciprocal of change reactor L.When line voltage reduced, the SCR conduction angle increased, and the LC parallel branch is perception.The deficiency that N1 goes up the post-compensation electrical network input voltage of connect with input voltage is coupled in the pressure drop of branch current on the N2 of transformer B1 winding and input homophase, and the output maintenance is stablized.The SCR conduction angle reduces when input voltage raises, and the LC parallel branch is capacitive.Pressure drop and the input inversion of branch current on the N2 of transformer B1, the voltage and the line voltage that are coupled on the N1 winding subtract each other, and output voltage is descended.Thereby system can change the size of the last voltage of transformer B1 and the automatic adjustment that phase place realizes output voltage automatically like this.The shunt-resonant circuit of C1 and L, SCR branch road, C2 and B1 shunt-resonant circuit constitute two-stage filter in the circuit, and the harmonic wave composition is greatly reduced.Capacitor C 3 also connects the output two ends and has further changed the distortion of waveform little.

The sampling of feedback voltage effective value has guaranteed that the whole loop of homophony output waveform has the precision of voltage regulation of output voltage under the distortion situation (effective value) in the system.The differential voltage amplifier can avoid system oscillation to improve job stability easily by regulating feedback resistance control open loop enlargement factor.

In the utility model, after the BL2 rectification, elder generation is by resistance R 8 and R12 dividing potential drop by the one group of Secondary Winding that is connected on output end of pressure-stabilizing transformer B3 for feedback voltage.The R12 both end voltage is sent the in-phase input end of differential voltage amplifier amplifier 22 after capacitor C 33 filtering.The theory and practice proof is when the enough high resistance R8 of B2 secondary side design voltage value is enough big, and whether the R12 both end voltage roughly is directly proportional with sinusoidal energy dispenser output voltage effective value, and distort irrelevant substantially with the output AC waveform.

Stabilivolt is used in voltage reference loop 42 in an embodiment, but series connection dividing potential drop that also can two resistance.

The differential voltage amplifier adopts the amplifier typical circuit among the embodiment, also can adopt other modes.

Transformer, the reactor of existing its major loop of power conditioner, all inductance elements all are linear inductance.Design much biggerly than conventional electrician for fear of the section selection of the sweep of opening magnetization curve, ferromagnetic material, so the existing product volume is big, heavy.The feedback sample circuit of existing power conditioner generally is designed to connect bridge rectifier behind its Circuit Fault on Secondary Transformer string semifixed resistor, and filter capacitor directly connects rectification and exports two ends, so tool output voltage (mean value) roughly is directly proportional with the peak value of major loop output voltage.This can correct reflecting voltage (effective value) for sine wave if the variation output waveform distortion is arranged, just disproportionate between the two, cause departure thus, influence output accuracy.The sampling error amplifier of existing power conditioner is generally only established and is exchanged negative feedback networking, no dc feedback network.Though can improve output accuracy like this, easily cause vibration, so complete machine is very strict to the parameter request of element.The utility model major loop has been cancelled on two resonant tanks with the reactor of capacitances in series, this has to a certain degree increased the distortion of exporting molten shape though compare with existing power conditioner, but the favourable aspect of bringing is the system loading ability to be strengthened, make the system response simplification that becomes simultaneously, be difficult for producing vibration, make complete machine possess at full capacity directly startup ability, simultaneously also reduced machine volume weight, reduced cost.Because the utility model adopts the voltage effective value sampling in the feedback voltage error amplifying circuit, the precision of voltage regulation that still can guarantee output voltage under the situation of certain distortion is arranged in output waveform, thereby so the capacity of the transformer in the whole loop of homophony, reactor can make that machine volume reduces, weight alleviates greatly by electrician's conventional design.A typical example is: commercially available 1KVA power conditioner complete machine weight is 17Kg, and the utility model is with capacity model machine weight 7Kg only.The utility model the key technical indexes is:

1. input voltage range and relevant voltage degree of stability:

187V～242V ≤±1％

170V～260V ≤±3％

150V～275V ≤±10％

2. laod stability≤2%

3. response time＜0.2S

4. additional molten shape distortion＜5～8%

5. spike inhibition 〉=30db

In sum, the utility model has been broken through the traditional understanding that transformer reactance device in the whole loop of the power conditioner homophony that generally believes for a long time is necessary for the line inductance, is the novel voltage stabilizing device that is fit to family expenses with the performance index of new approaches design.Series of advantages such as it possesses power conditioner technology high precision, fast-response, regulate continuously, anti-interference, have again can on-load directly start, in light weight, volume is little, price and the competitive new feature of other types family expenses voltage stabilizer.The unfailing performance of its excellence will fundamentally change the very high situation of present family expenses regulator products repair rate.

Claims

1, a kind of family expenses full-electronic purification type AC voltage regulator, by the whole loop 1 of controlled inductance formula homophony, forms with synchronous saw-toothed wave generator 2, pulse-length modulation (PWM) circuit 3 and the feedback voltage error amplifying circuit 4 of power supply, it is characterized in that: described controlled inductance formula homophony is put in order loop 1 by transformer B ₁, reactor L, bidirectional triode thyristor SCR and capacitor C ₁, C ₂, C ₃Form transformer B ₁Tap connect ac power input end, B ₁Termination AC power output, the other end is connected with reactor L, the other end of L is connected with bidirectional triode thyristor SCR anode, the SCR negative electrode connects zero-power line, capacitor C 1 is connected in parallel on L and SCR series arm two ends, capacitor C 2 is connected in parallel on the B1 two ends, capacitor C 3 is connected between output phase line and the zero line, described feedback voltage error amplifying circuit 4 is by voltage effective value sampling loop 41, voltage reference loop 42, differential voltage amplifier 43 is formed, the output terminal in the whole loop 1 of the input termination controlled inductance formula homophony of voltage effective value sampling loop 41, output termination differential voltage amplifier 43 in-phase input ends of voltage effective value sampling loop 41, the inverting input of differential voltage amplifier 43 connects the reference voltage output end in voltage reference loop 42, the inverting input of the amplifier 33 in output termination pulse-length modulation (PWM) circuit of differential voltage amplifier 43.

2, family expenses full-electronic purification type AC voltage regulator according to claim 1 is characterized in that: above-mentioned voltage effective value sampling loop 41 is by being connected on output end of pressure-stabilizing transformer B ₃One group of Secondary Winding through bridge BL ₂Rectification, its output negative terminal connects common port, and its output plus terminal is through resistance R ₈With R ₁₂Connect R ₁₂Another termination common port, capacitor C ₃₃Be parallel to R ₁₂Two ends, R ₈With R ₁₂Connection termination differential voltage amplifier 43 in the in-phase input end of amplifier 22.

3, family expenses full-electronic purification type AC voltage regulator according to claim 1, it is characterized in that: above-mentioned voltage reference loop 42 is by resistance R ₉With stabilivolt D ₂Be composed in series resistance R ₉Another termination+12 volt power supply, stabilivolt D ₂Positive termination common port, negative terminal and R ₉Connecting line through resistance R ₁₀Connect amplifier 22 inverting inputs.

4, family expenses full-electronic purification type AC voltage regulator according to claim 1, it is characterized in that: above-mentioned differential voltage amplifier 43 is by amplifier 22 and resistance R ₈, R ₁₀, R ₁₁, R ₁₂Form, wherein R ₈, R ₁₂The potential-divider network of double as voltage effective value sampling circuit 41, R ₁₀Be the end of oppisite phase input resistance of amplifier 22, between amplifier 22 inverting inputs and output terminal, be connected to feedback resistance R ₁₁, the inverting input of amplifier 33 in amplifier 22 output termination pulse-length modulation (PWM) circuit.