CN2443536Y

CN2443536Y - Impact current generator

Info

Publication number: CN2443536Y
Application number: CN 00240589
Authority: CN
Inventors: 张南法; 段强; 张梅
Original assignee: CHANGZHOU CHUANGJIE LIGHTNING PROTECTION Co Ltd
Current assignee: CHANGZHOU CHUANGJIE LIGHTNING PROTECTION Co Ltd
Priority date: 2000-10-12
Filing date: 2000-10-12
Publication date: 2001-08-15
Anticipated expiration: 2010-10-12

Abstract

The utility model relates to an impact current generator which comprises a power supply voltage conversion circuit, a change-discharge control circuit, an output port, a discharge switch Ks controlled by a controlling circuit, and an impulse forming circuit connected with the output end of the power supply voltage conversion circuit and at least the two circuits are connected in parallel. The power supply voltage conversion circuit, the impulse forming circuit, the discharge switch Ks and the output port are connected in series in a sample return circuit in turn. The change-discharge control circuit controls the charge and discharge of the impulse forming circuit through controlling the power supply voltage conversion circuit and the discharge switch Ks. The impact current generator has the advantages of low cost, safety and easy realization of the impedance match.

Description

Impulse current generator

The utility model relates to a kind of impulse current generator, and particularly a kind of heavy current impact current feedback circuit is used to detect the performance of preventing thunder and lightning and anti-overvoltage protection product.

Development along with information technology, integrated circuit (IC) is multiple functional because of it, low price, integrated level high use more and more wider, but also there is certain weakness simultaneously, for example under the overvoltage effect that thunder and lightning, electrical system operation and static etc. produce, very easily damage, finally can cause entire product decreased performance or breaking-up.Impulse current generator is mainly used in the impulse current that produces multiple waveform, is used for detecting the performance of anti-thunder and lightning and anti-overvoltage protection product.Impulse current generator is the storage capacitor C charging of charge power supply Uo in pulse shaping circuit (PFN), sees Fig. 1.When discharge switch Ks connects, PFN discharges to sample DUT, flow through the impulse current i of certain waveform and certain peak value in sample, present impulse current generator adopts the single loop discharge mostly, has certain defective: the electric current honeybee value i that requires during 1, as if test _pVery high, charging voltage Uo also requires very high, and this cost of equipment is increased, and brings certain safety problem for simultaneously operating personnel and equipment itself, exists potential safety hazard.Impedance matching difficulty when 2, testing.In general, for the waveform parameter that makes impact is limited in the scope that technical standard allows, the excursion of sample equiva lent impedance should be limited to ± scope of (0.3～0.4) Zo in, Zo is the source impedance of impulse current generator here.Form at individual pulse under the situation of circuit, have only a source impedance Zo value, the scope of ± (0.3～04) Zo is quite limited, and the impedance variation scope of actual samples is often much larger than this scope, so the impedance matching when testing becomes comparatively complicated.

The purpose of this utility model is to overcome the defective of prior art and impulse current generator that lower, the safer and easier realization impedance matching of a kind of cost is provided.

The technical scheme that realizes the utility model purpose is: a kind of impulse current generator, include the supply voltage translation circuit, charge-discharge control circuit, the discharge switch Ks of output port and the control of controlled circuit, also include at least two tunnel and the pulse shaping circuit that connects that are connected with the output of supply voltage translation circuit, and supply voltage translation circuit, pulse shaping circuit, discharge switch Ks and output port are serially connected in the sample loop successively, and charge-discharge control circuit comes control impuls to form the charging and the discharge of circuit by control supply voltage translation circuit and discharge switch Ks.

Adopt the positive effect that the utlity model has of technique scheme:, under the situation of discharging simultaneously, suppose that the source anti-Zo of sun on each road equates, then for making the impulse current peak value reach i by the n road because pulse shaping circuit has 2 the tunnel at least _p, the charging voltage of requirement is Uom=(Zoi _p/ therefore n+Up) under the specimen voltage Up situation not very big, for obtaining same i with respect to charging voltage Uom _p, the charging voltage when a plurality of pulse shaping circuits discharge simultaneously, the 1/n when being roughly individual pulse formation circuit discharging.For example, under four road situations of discharging simultaneously, Uom is as long as 12KV just can obtain the electric current of the 8/20 μ S of 40KA, and forming the equipment of circuit discharging for individual pulse, voltage U om is about 50KV, so the utility model is more secure when used, cost is also lower, has reduced accident potential.Under the situation of a plurality of pulse shaping circuit work,, can select one tunnel discharge by switching, or two the road discharge simultaneously, or the n road discharges simultaneously, thereby sample is just had n kind source impedance, so that the sample impedance phase coupling with different has solved resistance matching problem better.

Below in conjunction with accompanying drawing the utility model is described in further detail.

Fig. 1 is the theory diagram of existing impulse current generator;

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

Fig. 3 is the utility model embodiment electrical schematic diagram.

The utility model shown in Figure 2 includes supply voltage translation circuit 1, is used for power supply is carried out processing such as boost in voltage, rectification, then gives pulse shaping circuit 3 chargings; And be used for paired pulses and form the charging of circuit 3 and the charge-discharge control circuit 2 that discharge is controlled, when pulse shaping circuit 3 charges to set point, charge-discharge control circuit 2 voltage conversion circuit 1 of cutting off the electricity supply, control discharge switch Ks simultaneously and make it closed, make pulse shaping circuit 3 give sample 5 discharges by output port 4.Inventive point of the present utility model is: include at least 2 the tunnel and the pulse shaping circuit (PFN) 3 that connects, be used to produce the multichannel impulse current, stack simultaneously flows to sample 5.Supply voltage translation circuit 1, pulse shaping circuit (PFN) 3, discharge switch Ks, output port 4 are serially connected in sample 5 loops successively, and charge-discharge control circuit 2 comes control impuls to form the charging and the discharge of circuit (PFN) 3 by control supply voltage translation circuit 1 and discharge switch Ks.

The supply voltage translation circuit 1 of the utility model embodiment shown in Figure 2 includes commercially available filter, charge switch Ko, voltage regulator AT, step-up transformer B and rectification circuit ZL, and wherein charge switch Ko is by charge-discharge control circuit 2 controls.Described charge-discharge control circuit 2 includes the measuring circuit CL that is attempted by rectification circuit ZL two ends, reception is from signal and the voltage signal of existing voltage setting circuit ST setting and the comparison circuit BJ that compares of CL, the output one tunnel of comparison circuit BJ give or the door OR1 to rest-set flip-flop, the output of rest-set flip-flop (RSFF) meets existing control circuit KZ1, and control charge switch Ko disconnects; PSFF is the ordinary skill in the art to the control mode of control circuit KZ1 and Ko, another road of BJ output by or door OR2 to existing control circuit KZ2, control charge switch Ks connects, this also is this area routine techniques.Pulse shaping circuit in the present embodiment (PFN) 3 is made of 3 road RLC networks, the storage capacitor C1 of first via pulse shaping circuit (PFN) is attempted by the ZL two ends, inductance L 1, resistance R 1 and slide plate switch S L series connection back are connected with discharge switch Ks, second, third road pulse shaping circuit is in series by electric capacity, inductance and resistance, be attempted by between the end (being the ZL negative terminal) and slide plate switch S L of capacitor C 1, slide plate switch S L can be connected with No. one pulse shaping circuit, realizes one tunnel discharge; Also can be connected, realize that two-way discharges simultaneously with the two-way pulse shaping circuit; No. three pulse shaping circuits all can also be connected, realize three the tunnel and connect discharge.The pulse shaping circuit 3 of present embodiment can be 2 road RLC networks and connect composition, also can be RLC network and connect composition more than 3 tunnel.Pulse shaping circuit 3 in the present embodiment can also adopt RC or LC network, and wherein C is an energy-storage travelling wave tube, all is that the storage capacitor C in the first via pulse shaping circuit is attempted by the ZL two ends, the same present embodiment of all the other connected modes.In order to test the size of charging voltage, give voltmeter M indication size with the voltage of measuring circuit CL.Equally, be the discharging current that flows through in test sample 5 both end voltage and the sample 5, behind the existing voltage divider FY in parallel of sample two ends, be connected, serial connection magnetic potentiometer CW in the sample loop with peak voltmeter DMU, the current signal of CW is detected by crest ammeter DMI and shows that these all are routine techniquess.

The concrete course of work of the present utility model is as follows: earlier predetermined charging voltage is configured with voltage setting circuit ST, supply voltage is delivered to controlled charge switch Ko through power-supply filter DL, after pressing charge button AN1, rest-set flip-flop is output as high level, control circuit KZ1 action, connect Ko, alternating voltage is delivered to step-up transformer B behind voltage regulator AT, and the ac output voltage of B capacitor C1 to pulse shaping circuit behind rectification circuit ZL charges.Charge, charge to C3 to C2 by L1, R1, R2, L2 and slide plate switch S L by L1, R1, R3, L3 and slide plate switch S L.DC charging voltage is measured by measuring circuit CL, give ammeter M indication, give comparison circuit BJ simultaneously, compare with the setting voltage that voltage setting circuit ST sends here, when charging voltage was raised to set point, comparison circuit BJ sent high level, a warp or a door OR1 reset rest-set flip-flop, control KZ1 action disconnects Ko, thereby stops charging; The output of comparison circuit BJ warp or door OR2 control KZ2 action on the other hand, make discharge switch K2 closure, C1 in the pulse shaping circuit, C2, C3 can discharge to sample (DUT) 5 simultaneously, thereby make the electric current that flows through in the sample 5 form the electric current that circuit discharges considerably beyond individual pulse.Form circuit with individual pulse and compare, for making same electric current and the voltage of generation in the sample 5, capacitor C 1 of the present utility model, C2, C3 charging voltage value can descend greatly, and therefore fail safe of the present utility model is better, and cost is lower.For can be better and the impedance matching of sample, can select 1 the tunnel, the 2 tunnel by the slide plate switch, until the n road and connect, solved resistance matching problem well.Discharging current is detected by magnetic potentiometer CW, and the current signal of CW is detected by crest ammeter DMI or oscilloscope and shows.The voltage at sample two ends gives peak voltmeter DMU behind voltage divider FY or oscilloscope detects and demonstration.But push the closed discharge of discharge button AN2 forced electric discharge K switch s.

Claims

1, a kind of impulse current generator, include supply voltage translation circuit (1), charge-discharge control circuit (2), the discharge switch Ks of output port (4) and controlled circuit (2) control, it is characterized in that: also include at least two tunnel and the pulse shaping circuit (3) that connects that are connected with the output of supply voltage translation circuit (1), and supply voltage translation circuit (1), pulse shaping circuit (3), discharge switch Ks and output port (4) are serially connected in the sample loop successively, and charge-discharge control circuit (2) comes control impuls to form the charging and the discharge of circuit (3) by control supply voltage translation circuit (1) and discharge switch Ks.

2, impulse current generator according to claim 1, it is characterized in that: pulse shaping circuit (3) is the RLC network, the storage capacitor C1 of first via pulse shaping circuit is attempted by supply voltage translation circuit (1) two ends, inductance L 1, resistance R 1 and slide plate switch S L series connection back are connected with discharge switch K2, and remaining pulse shaping circuit is connected between the end (being power supply negative terminal) and slide plate switch S L of capacitor C 1 after being connected by electric capacity, inductance and resistance.

3, impulse current generator according to claim 1 is characterized in that: described pulse shaping circuit (3) is a RC network.

4, impulse current generator according to claim 1 is characterized in that: described pulse shaping circuit (3) is the LC network.