CN2513271Y

CN2513271Y - Super fast precision over-voltage protector

Info

Publication number: CN2513271Y
Application number: CN 01247971
Authority: CN
Inventors: 杨建才
Original assignee: Individual
Current assignee: Individual
Priority date: 2001-10-23
Filing date: 2001-10-23
Publication date: 2002-09-25
Anticipated expiration: 2011-10-23

Abstract

The utility model relates to a super fast precision over-voltage protector, which comprises a power input circuit(F1) and a power output circuit(F 6). The utility model is characterized in that: the utility model is mainly formed by an over-voltage protection circuit(F4) and an over-voltage measuring and control circuit(F7). The over-voltage protection circuit provides the over-voltage measuring and controls the circuit voltage signal, and then sends the control signal to the voltage protection circuit through the checking. The over-voltage protection circuit is also connected with the internal over-voltage absorbing circuit(F3) and an output phase shift circuit(5), and the internal over-voltage absorbing circuit is also connected with a thunderstroke over-voltage absorbing circuit(F2). The utility model adopts the filter formed by big powder L, G, which has very strong absorbing and filtrating effects for the thunderstroke sensing over-voltage and internal over-voltage, and improves the quality and anti interfere, thereby reaching the absolute safety of the electric device on the output end. The utility model has high reliability and stability for long-term running.

Description

Supper-fast accurate overvoltage protection device

Technical field

The utility model relates to the electric prospection technology, specifically supper-fast accurate overvoltage protection system.

Background technology

The overvoltage of ac power supply system generally can be divided into Lightning Over-voltage and two kinds of main conditions of internal overvoltage, Lightning Over-voltage can be subdivided into thunderbolt again and attack overvoltage and lightning strike induction voltage dual mode directly, and internal overvoltage also can be divided into " power-frequency overvoltage (single phase ground fault, load rejection, the rising of non-loaded line terminal voltage etc.), switching overvoltage (disconnect inductive load, close non-loaded line, overlap non-loaded line, cut nonloaded line or capacitive load, arcing ground etc.) ".These superpotential common features show that roughly the crest voltage when overvoltage occurring is higher, but the duration is all shorter, and (220V.AC, 50HZ) electric power system is protected to low pressure generally to adopt devices such as lightning protection device or piezo-resistance.

Also having a kind of overvoltage is the overvoltage that the line voltage grade breaks down and causes, this class overvoltage occurs in the 380V.AC power supply and seals in 220V.AC low-voltage power supply loop, this overvoltage does not exist the duration that notion how long is arranged, do not having before the disengagement failure power supply, this overvoltage will exist all the time.The conventional overvoltage protecting device that uses loses due protective effect too slowly because of the time of excision at present, and important often electric equipment damages, and over-voltage protection switch just disconnects.

Facts have proved; the overvoltage that this supply voltage grade fault produces; adopting very fast piezo-resistance of responsiveness or moment inhibition diode to protect also is difficult to really prove effective; one of its major reason is exactly that the dispersiveness of these device voltage grades is big and power is less; seal in the failure condition of 220V.AC current supply circuit from the 380V.AC that once takes place; 220V.AC electric power loop has been connected to the piezo-resistance explosion of 250V.AC effective value in advance; cause UPS badly damaged; cause the piezo-resistance explosion in the DCS Switching Power Supply simultaneously, the serious accident that Switching Power Supply is damaged.

Up to the present; all find no the high-power overvoltage protection that is used for the large-scale precision electric equipment both at home and abroad; particularly the inventor is engaged in the application technology development process of DCS (monitoring of collective and distributive type industrial computer and management system) system in recent years; successively running into 380V.AC twice seals in the 220V.AC power-supply system; cause the serious accident of the DCS system failure of millions of units, feel development deeply and produce urgency and the important techniques economic worth that a kind of energy fast, safely, reliably carries out overvoltage protection.

Summary of the invention

The purpose of this utility model provides a kind of externally when electric power system breaks down, can practicable quick overvoltage protection, fundamentally guarantee the supper-fast accurate overvoltage protection system of these electric equipment Electrical Safety.

The technical solution of the utility model: implement overvoltage protection with core automatic control equipments such as mainframe computer DCS systems to height continuity production process; the problem of most critical is exactly the high reliability problem that must take into full account in all its bearings and study as overvoltage protection self; short spikes of duration such as various internal overvoltages that power supply is occurred and lightning strike induction voltage; possess fast Absorption and filter function, prevent that this part surge voltage from continuing to pass to subsequent conditioning circuit.Genuine overvoltage for the electric power system appearance, for example the power supply of 400V electric pressure seals in the 220V electric pressure, then must fast detecting go out, and trouble power is cut off with the fastest speed, it is perfectly safe to accomplish, and have very strong antijamming capability, guarantee under the normal power supply situation misoperation can not occur.

For realizing above-mentioned functions, the particular circuit configurations that adopts is: this supper-fast accurate overvoltage protection device comprises power supply input circuit (F1) and power output circuit (F6), it is characterized in that mainly by excess voltage protection (F4) and over-voltage measurement and control circuit (F7) formation, excess voltage protection provides over-voltage measurement and control circuit voltage signal, control signal is sent back to excess voltage protection after after testing; Excess voltage protection (F4) is mainly by at least one air switch (2PK2,2PK3), thyristor SCR1, SCR2 constitute, the anode of thyristor SCR1 is connected with the negative electrode of thyristor SCR2, the anode of thyristor SCR2 is connected with the negative electrode of thyristor SCR1, the negative electrode of SCR1 links to each other with an end of air switch, the negative electrode of SCR2 links to each other with the other end of air switch, the emitter of triode N2 in the gate pole of SCR1 and over-voltage measurement and the control circuit is connected, and the emitter of the triode N3 in the gate pole of SCR2 and over-voltage measurement and the control circuit is connected; Over-voltage measurement and control circuit (F7) are partly to be made of F7-1 and F7-2 two; F7-1 (or F7-2) is by transformer GB1; DB1; rectification circuit (ZL1; ZL2); voltage stabilizing circuit; voltage reference circuit (JZ1; RP1; C14; R7; R8); measuring circuit (C9; C10; R9; R10); relatively amplifying circuit and power amplification circuit constitute; its connection is connected with rectification circuit for the secondary coil of transformer; rectification circuit (ZL1) is connected with voltage stabilizing circuit; voltage stabilizing circuit is connected with voltage reference circuit again; rectification circuit (ZL2) is connected with measuring circuit; relatively the input of amplifying circuit is connected with voltage reference circuit with measuring circuit; relatively the output of amplifying circuit is connected with power amplification circuit; the output signal of power amplification circuit is connected with excess voltage protection F4, and F7-1 also is connected with excess voltage protection F4 with ac-dc conversion circuit F8.

Feature of the present utility model is that also excess voltage protection also is connected with internal overvoltage and absorbs circuit (F3); it is mainly by inductance coil L01; capacitor C 01, C02, C35 constitute; the end of L01 links to each other with an end of capacitor C 01; the other end of L01 links to each other with the end of C02 and the end of C35, and the other end of C01 is connected with the other end of the other end of C02 and C35.Excess voltage protection also is connected with output phase-shift circuit (F5), and it is made of inductance coil L04 and capacitor C 03, C04, and the end of L04 is connected with the end of the end of C03 and C04, and the other end of C03 is connected with the other end of C04.Internal overvoltage absorbs circuit and also is connected with Lightning Over-voltage absorption circuit (F2).

The topmost characteristics of the utility model show the following aspects:

1, to 220V.AC, the large power supply of 50HZ or 60HZ is carried out supper-fast overvoltage protection, and overvoltage occurring from system generally only needs about 5 * 10 to the excision trouble power ^-5Second.

2, because the filter that adopts high-power L, C to constitute has very strong absorption and filter action to lightning strike induction voltage and internal overvoltage, improved the quality and the antijamming capability of power supply.

3, particularly when voltage levels 380V.AC seals in the 220V.AC loop of low-voltage grade, reach by quick overvoltage protection loop and high-power L, C output phase-shift circuit and to guarantee being perfectly safe of output power consumption equipment.

4, the high reliability and the high stability that have long-time running, this high reliability are finally to realize by high-quality power electronic device and advanced circuit design.

Description of drawings

Fig. 1 is an overvoltage protection device block diagram of the present utility model;

Fig. 2 is the circuit theory diagrams of overvoltage protection device of the present utility model;

Fig. 3 is measurement of the present utility model and control circuit block diagram;

Fig. 4 is an ac-dc conversion circuit schematic diagram of the present utility model.

Specific embodiments

As shown in Figure 1, the utility model comprises that supper-fast accurate overvoltage protection device absorbs circuit F2, internal overvoltage absorption circuit F3, excess voltage protection F4, over-voltage measurement and control circuit F7, ac-dc conversion circuit F8, output phase-shift circuit F5 and power output circuit F6 by power supply input circuit F1, Lightning Over-voltage and forms.Excess voltage protection provides over-voltage measurement and control circuit voltage signal, control signal is sent back to excess voltage protection after after testing.As shown in Figure 2; excess voltage protection F4 is by two bipolar air switch 2PK2; 2PK3; capacitor C 4; C5; C6; resistance R 2; R3; inductance coil L2; L3; thyristor SCR1; SCR2 constitutes (power electronic device of classes such as also available gate turn off thyristor GTO or insulated gate bipolar transistor replaces); the anode of thyristor SCR1 links to each other with the end of inductance coil L2 and the end of C6; the other end of C6 links to each other with the end of R3; the other end of R3 links to each other with the negative electrode of thyristor SCR1; the anode of thyristor SCR2 links to each other with the end of inductance coil L3 and the end of C5; the other end of C5 links to each other with the end of R2; the other end of R2 links to each other with the negative electrode of SCR2; the end of C4 links to each other with the other end of the negative electrode of SCR1 and L3; the other end of C4 links to each other with the other end of the negative electrode of SCR2 and L2; the output of bipolar air switch is in parallel with C4; the emitter of triode N2 in the gate pole of SCR1 and over-voltage measurement and the control circuit is connected, and the emitter of the triode N3 in the gate pole of SCR2 and over-voltage measurement and the control circuit is connected.Over-voltage measurement and control circuit F7 partly are made of F7-1 and F7-2 two; F7-1 (circuit of F7-2 constitutes identical with F7-1) is by transformer GB1; DB1; rectification circuit ZL1 (and capacitor C 7; C28 and resistance R 5); ZL2; voltage stabilizing circuit; voltage reference circuit (comprises voltage reference JZ1; adjustable resistance RP1; capacitor C 14; resistance R 7; R8; its connecting relation as shown in Figure 2); measuring circuit (comprises capacitor C 9; C10; resistance R 9; R10; connecting relation as shown in Figure 2); relatively amplifying circuit and power amplification circuit constitute; its connection is connected with rectification circuit for the secondary coil of transformer; rectification circuit ZL1 is connected with voltage stabilizing circuit; voltage stabilizing circuit is connected with voltage reference circuit again; rectification circuit ZL2 is connected with measuring circuit; relatively the input of amplifying circuit is connected with voltage reference circuit with measuring circuit; relatively the output of amplifying circuit is connected with power amplification circuit; the output signal of power amplification circuit is connected with excess voltage protection F4; F7-1 also is connected wherein voltage stabilizing circuit by integrated regulator V1 and capacitor C 12 with ac-dc conversion circuit F8 with excess voltage protection F4; two utmost point D8 form, and its connecting relation as shown in Figure 2.Relatively amplifying circuit is made up of operational amplifier A 1, resistance R 6, R11, R12, capacitor C 15, and its connecting relation as shown in Figure 2.Power amplifier is by triode N1, N2, P1, P2, and resistance R 13, R14, R15, R16, R29, R30, R33 form, and its connecting relation as shown in Figure 2.

Excess voltage protection also is connected with internal overvoltage and absorbs circuit F3; it mainly (also can seal in inductance coil L02 by inductance coil L01 between C01 and C02; as shown in Figure 2), capacitor C 01, C02, C35 constitute; the end of L01 links to each other with an end of capacitor C 01; the other end of L01 links to each other with the end of C02 and the end of C35, and the other end of C01 is connected with the other end of the other end of C02 and C35.

Excess voltage protection also is connected with output phase-shift circuit F5; it (also can seal in inductance coil L03 by inductance coil L04 between the cathode terminal of thyristor SCR1 and capacitor C 03; as shown in Figure 2) and capacitor C 03, C04 constitute; the end of L04 is connected with the end of the end of C03 and C04, and the other end of C03 is connected with the other end of C04.

Internal overvoltage absorbs circuit and also is connected with Lightning Over-voltage absorption circuit F2.

The concrete formation of ac-dc conversion circuit F8 as shown in Figure 4, the concrete formation of power supply imput output circuit F1, F6 is as shown in Figure 2.

Operation principle:

As shown in Figure 2; 220V.AC the single phase alternating current power supply of 50HZ; enter the input circuit F1 of supper-fast overvoltage protection device through total power switch 2PK1, can demonstrate the numerical value of incoming power voltage and current simultaneously, help the power supply that enters overvoltage protection device is monitored.This power supply will be sent to excess voltage protection F4, over-voltage measurement and control circuit F7 through the level and smooth power supply of filtering again, and be sent to AC/DC translation circuit F8 (shown in Figure 4) simultaneously after absorbing circuit F2 and internal overvoltage absorption circuit F3 through Lightning Over-voltage.Power supply behind excess voltage protection F4 is being sent to output phase-shift circuit F5, and the power supply after phase shift just is sent to output loop F6 as the safety power supply that supper-fast overvoltage protection device is confirmed.

When power supply was lower than predefined threshold voltage (for example effect value of 240V.AC), two thyristor SCR1 and SCR2 among the excess voltage protection F4 all were in off state, remove outside the very little leakage current of thyristor, and this circuit is consumed power not.

Output phase-shift circuit F5 is used for the moment of the system that seals at high voltage, make the supply voltage of output postpone certain phase angle than input, like this, when overvoltage appears in power supply, also action (conducting) is not preceding for thyristor SCR1 and SCR2, guarantees that the supply voltage of output still is lower than the safe voltage value of customer requirements.

When the supply voltage that enters excess voltage protection F4 surpasses predefined threshold voltage; over-voltage measurement and control circuit F7 send control signal rapidly; thyristor SCR1 and SCR2 always have a positive half cycle or a rapid conducting of negative half period corresponding to power supply; for power-supply system; thyristor SCR1 and SCR2 conducting approach power supply short circuit; the voltage of output is clamped to about 10V rapidly; and be forced to bipolar air switch 2PK1; at least one action (tripping) among 2PK2 and the 2PK3; thereby emergency power supply is cut off; this has just fundamentally been avoided because of the air switch responsiveness causes again the high voltage string being arrived follow-up important power consumption equipment in the moment of air switch tripping operation slowly, and the various accidents that cause electronic devices and components to damage take place.

Abnormal overvoltage occurs from power supply and be about 5 * 10 to time out-put supply end clamp ^-5Second, the time length of air switch action no longer influences the voltage at Rfz among the output circuit F6 (power consumption equipment equivalent resistance) two ends.

Claims

1, a kind of supper-fast accurate overvoltage protection device, comprise power supply input circuit (F1) and power output circuit (F6), it is characterized in that mainly by excess voltage protection (F4) and over-voltage measurement and control circuit (F7) formation, excess voltage protection provides over-voltage measurement and control circuit voltage signal, control signal is sent back to excess voltage protection after after testing; Excess voltage protection (F4) is mainly by at least one air switch (2PK2,2PK3), thyristor SCR1, SCR2 constitute, the anode of thyristor SCR1 is connected with the negative electrode of thyristor SCR2, the anode of thyristor SCR2 is connected with the negative electrode of thyristor SCR1, the negative electrode of SCR1 links to each other with an end of air switch, the negative electrode of SCR2 links to each other with the other end of air switch, the emitter of triode N2 in the gate pole of SCR1 and over-voltage measurement and the control circuit is connected, and the emitter of the triode N3 in the gate pole of SCR2 and over-voltage measurement and the control circuit is connected; Over-voltage measurement and control circuit (F7) are partly to be made of F7-1 and F7-2 two; F7-1 (or F7-2) is by transformer GB1; DB1; rectification circuit (ZL1; ZL2); voltage stabilizing circuit; voltage reference circuit (JZ1; RP1; C14; R7; R8); measuring circuit (C9; C10; R9; R10); relatively amplifying circuit and power amplification circuit constitute; its connection is connected with rectification circuit for the secondary coil of transformer; rectification circuit (ZL1) is connected with voltage stabilizing circuit; voltage stabilizing circuit is connected with voltage reference circuit again; rectification circuit (ZL2) is connected with measuring circuit; relatively the input of amplifying circuit is connected with voltage reference circuit with measuring circuit; relatively the output of amplifying circuit is connected with power amplification circuit; the output signal of power amplification circuit is connected with excess voltage protection F4, and F7-1 also is connected with excess voltage protection F4 with ac-dc conversion circuit F8.

2, supper-fast accurate overvoltage protection device according to claim 1; it is characterized in that excess voltage protection also is connected with internal overvoltage and absorbs circuit (F3); it is mainly by inductance coil L01; capacitor C 01, C02, C35 constitute; the end of L01 links to each other with an end of capacitor C 01; the other end of L01 links to each other with the end of C02 and the end of C35, and the other end of C01 is connected with the other end of the other end of C02 and C35.

3, supper-fast accurate overvoltage protection device according to claim 1; it is characterized in that excess voltage protection also is connected with output phase-shift circuit (F5); it is made of inductance coil L04 and capacitor C 03, C04; the end of L04 is connected with the end of the end of C03 and C04, and the other end of C03 is connected with the other end of C04.

4, supper-fast accurate overvoltage protection device according to claim 1 and 2 is characterized in that internal overvoltage absorbs circuit and also is connected with Lightning Over-voltage absorption circuit (F2).