CN2821584Y - Electric quick transition pulse group switch circuit - Google Patents
Electric quick transition pulse group switch circuit Download PDFInfo
- Publication number
- CN2821584Y CN2821584Y CN 200520014640 CN200520014640U CN2821584Y CN 2821584 Y CN2821584 Y CN 2821584Y CN 200520014640 CN200520014640 CN 200520014640 CN 200520014640 U CN200520014640 U CN 200520014640U CN 2821584 Y CN2821584 Y CN 2821584Y
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- circuit
- pulse
- discharge switch
- eft
- fast transient
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Abstract
The utility model relates to an electric fast transient pulse-group switch circuit, which is used for simulatively exerting transient interference on equipment under test so as to determine the immunity degree to the interference of the fast transient pulse group. The existing product has the defects of poor operation reliability of the circuit, poor repeatability of the pulse waveform, poor pulse repetition frequency, big noise and high cost. A high-voltage power supply of the utility model is a single-polarity direct-current high-voltage power supply, and a polarity switching circuit is arranged between a discharge switch and the input end of a signal forming circuit. The utility model omits a negative-polarity direct-current high-voltage power supply and a power supply polarity-switching switch so as to reduce the cost, and has the advantages of good operation reliability of the circuit, small noise, good repeatability of the pulse and high pulse repetition frequency.
Description
[technical field]
The utility model relates to the EFT on-off circuit of a kind of nanosecond fast driving, belong to electromagnetic compatibility (EMC) field tests, it is the core component of electrical fast transient (eft) (EFT) generator, be used for disturbing to being subjected to examination equipment (EUT) simulation to apply transition, thus the immunity to interference of definite EUT fast transient pulse train.
[background technology]
Consumer often suffers the harassing and wrecking of various electricity and electromagnetism in actual use, for example inductive load cut-out, relay contact spring etc., and these all might influence equipment performance even cause device damage.Therefore before consumer comes into operation, need simulate the test of the fast transient of higher repetitive frequency to it.For many consumers, the electrical fast transient (eft) immunity to interference has become the compulsory test project that obtains the 3C authentication.To this evaluation of indexes is by fast transient burst generator EUT to be applied the pulse train that conformance with standard requires, and investigates then whether the duty of EUT normally realize.
The core of fast transient burst generator is the EFT on-off circuit.Have the EFT on-off circuit now as shown in Figure 1, it is by high voltage supply source 1, tank circuit 2, discharger K
2', polarity switching circuit 3 and waveshaping circuit 4 be formed by connecting, high voltage supply source 1 links to each other with tank circuit 2, tank circuit 2 is by discharger K
2Link to each other with waveshaping circuit 4, waveshaping circuit 4 connects pulse train output port 5, and foregoing circuit all altogether.Wherein, high voltage supply source 1 is by direct current positive high voltage source U+, negative direct current high voltage source U-and power selection switch K
1Form.This on-off circuit passes through K
1Switch positive and negative high-voltage power supply and control output polarity: as power selection switch K
1When connecting positive high voltage source U+, discharger K
2' closure, the pulse polarity of output is for just; As power selection switch K
1When connecting negative high voltage source U-, discharger K
2' closure, the pulse polarity of output is for negative.Existing this EFT on-off circuit is because K
2Adopt ambipolar discharger, circuit working reliability and pulse waveform repeatability are all poor, pulse recurrence rate low (generally being up to 100kHz), and noise is bigger.In addition, owing to need to use two high-voltage power supplies, cost is higher.
[utility model content]
In order to solve the above-mentioned problems in the prior art, the utility model provides a kind of electrical fast transient (eft) on-off circuit, to reach the purpose that improves circuit working reliability and pulse recurrence rate, improves pulse waveform repeatability, reduces noise and reduce cost.
For this reason, the utility model adopts following technical scheme: the electrical fast transient (eft) on-off circuit, it comprises the high voltage supply source, tank circuit, discharge switch, waveshaping circuit and pulse train output port, the output terminal in high voltage supply source connects the input end of tank circuit, the output terminal of tank circuit connects discharge switch, the output terminal of waveshaping circuit connects the pulse train output port, it is characterized in that: described high voltage supply source is a unipolar dc high-voltage source, is provided with polarity switching circuit between the input end of described discharge switch and waveshaping circuit.
High voltage supply of the present utility model source is unipolar dc high-voltage source, has saved negative polarity dc high-voltage source of the prior art and electric power polarity change-over switch, has reduced cost, controls output polarity by the state that changes polarity switching circuit.The pulse polarity change-over switch is located between the input end of discharge switch and waveshaping circuit, and no matter which kind of state polarity switching circuit is in, and the electric current of the discharge switch of flowing through is always single direction, can not produce disadvantageous reverse voltage at the discharge switch two ends.Therefore, discharge switch of the present utility model can adopt unipolarity semiconductor discharge switch, and the response time can reach nanosecond, working stability, and long service life, noise is little.
Polarity switching circuit of the present utility model comprises four switches, is beneficial to the control output polarity.
Be connected with duration of pulse formation resistance between the input end of waveshaping circuit of the present utility model and the earth terminal, this duration of pulse forms resistance two ends and is parallel with high tension porcelain capacitance, to absorb the higher hamonic wave in the pulse, improves pulse waveform.
Discharge switch of the present utility model is connected with the discharge switch driving circuit, and described discharge switch driving circuit comprises continuous buffer circuit and pulse shaping circuit, is provided with rapid light coupling in this buffer circuit.The TTL control signal through light-coupled isolation again through pulse shaping rear drive discharge switch.The response time of rapid light coupling can reach nanosecond.
On-off circuit of the present utility model is enclosed within the can, the signal input part of control discharge switch driving circuit is connected with 50 Ω concentric cable, to guarantee that frequency is that 1MHz, rising edge, negative edge are the input end that the control signal of nanosecond is transferred to driving circuit, reduces electromagnetic interference losslessly.
The beneficial effects of the utility model are: save negative polarity dc high-voltage source of the prior art and electric power polarity change-over switch, reduced cost, and the good reliability of circuit working, noise is little, and pulse reproducibility is good, pulse repetition rate height (reaching 1MHz).
[description of drawings]
Fig. 1 is existing EFT on-off circuit schematic diagram.
Fig. 2 is a major loop schematic diagram of the present utility model.
Fig. 3 is a discharge switch driving circuit schematic diagram of the present utility model.
[embodiment]
The major loop schematic diagram of electrical fast transient (eft) on-off circuit as shown in Figure 2, by dc high-voltage source 1, tank circuit 2, discharge switch K
2, polarity switching circuit 3 and waveshaping circuit 4 and high-voltage radio-frequency socket 5 (pulse train output port) be formed by connecting, wherein tank circuit 2 comprises charging resistor R
cWith storage capacitor C
c, waveshaping circuit 4 comprises the impedance matching resistance R
m, capacitance C
d, the duration of pulse forms resistance R
sWith filter capacitor C
sPolarity switching circuit 3 is by four reversing switch K
3, K
4, K
5, K
6Be formed by connecting as figure.
Discharge switch K
2Control end connect discharge switch driving circuit (as shown in Figure 3), comprise buffer circuit 6 and pulse shaping circuit 7.Buffer circuit 6 comprises optocoupler U
1, two groups of insulating power supply VCC/GND, VDD/GND1, shunt capacitance C
1, C
2Pulse shaping circuit 7 is by schmitt inverter U
2Constitute.Optocoupler U
1V
DD1Termination power VCC, switch controlling signal (Transistor-Transistor Logic level) are connected to the V of optocoupler by 50 Ω coaxial wires
IEnd, the GND of optocoupler
1End is connected to GND end, the V of optocoupler
DD2End is connected to power vd D, the GND of optocoupler
2End is connected to GND1 end, the V of optocoupler
OEnd is connected to schmitt inverter U
2Input end, phase inverter U
2Output terminal be connected to the trigger end of discharge switch.Optocoupler U wherein
1Be supper-fast optocoupler, the response time is a nanosecond, utilizes schmitt inverter U
2But return difference characteristic filtering pulse in little burr, making pulse edge become more precipitous, is 1MHz thereby make frequency, and dutycycle is 50%, the pulse signal that rising edge, negative edge reach nanosecond triggers discharge switch effectively, guarantees that the pulse train repetition frequency reaches 1MHz.
Whole EFT on-off circuit all is enclosed within the can, separates with external circuit, to reduce electromagnetic interference.
During use, the signal input part connection control signal of discharge switch driving circuit, 5 connections of high-voltage radio-frequency socket are subjected to examination equipment.
The output of dc high-voltage source 1 is by charging resistor R
cGive storage capacitor C
cStorage capacitor C is treated in charging
cOn voltage be full of substantially after, if to want output polarity be positive pulse train, then disconnect reversing switch K
5, K
6, closed reversing switch K
3, K
4, closed again discharge switch K
2, by duration of pulse formation resistance R
s, filter capacitor C
s, the impedance matching resistance R
mWith capacitance C
dProduce the fast transient pulse,, then disconnect reversing switch K if want output polarity to be negative pulse
3, K
4, closed reversing switch K
5, K
6, closed again discharge switch K
2
Claims (5)
1, electrical fast transient (eft) on-off circuit, it comprises high voltage supply source, tank circuit, discharge switch, waveshaping circuit and pulse train output port, the output terminal in high voltage supply source connects the input end of tank circuit, the output terminal of tank circuit connects discharge switch, the output terminal of waveshaping circuit connects the pulse train output port, it is characterized in that: described high voltage supply source is a unipolar dc high-voltage source, is provided with polarity switching circuit between the input end of described discharge switch and waveshaping circuit.
2, electrical fast transient (eft) on-off circuit according to claim 1 is characterized in that: described polarity switching circuit comprises four reversing switch.
3, electrical fast transient (eft) on-off circuit according to claim 1, it is characterized in that: be connected with duration of pulse formation resistance between the input end of described waveshaping circuit and the earth terminal, this duration of pulse forms resistance two ends and is parallel with high tension porcelain capacitance.
4, electrical fast transient (eft) on-off circuit according to claim 1, it is characterized in that: described discharge switch is connected with the discharge switch driving circuit, described discharge switch driving circuit comprises continuous buffer circuit and pulse shaping circuit, is provided with rapid light coupling in this buffer circuit.
5, electrical fast transient (eft) on-off circuit according to claim 1, it is characterized in that: described on-off circuit is enclosed within the can, and the signal input part of control discharge switch driving circuit is connected with 50 Ω concentric cable.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520014640 CN2821584Y (en) | 2005-09-02 | 2005-09-02 | Electric quick transition pulse group switch circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520014640 CN2821584Y (en) | 2005-09-02 | 2005-09-02 | Electric quick transition pulse group switch circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2821584Y true CN2821584Y (en) | 2006-09-27 |
Family
ID=37018138
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200520014640 Expired - Lifetime CN2821584Y (en) | 2005-09-02 | 2005-09-02 | Electric quick transition pulse group switch circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2821584Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102315841A (en) * | 2011-09-01 | 2012-01-11 | 上海电力学院 | Electrical fast transient burst discharge switch driver circuit |
| CN102570362A (en) * | 2010-12-14 | 2012-07-11 | 贵阳铝镁设计研究院有限公司 | Configuration structure for pole changing of DC (direct current) bus |
-
2005
- 2005-09-02 CN CN 200520014640 patent/CN2821584Y/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102570362A (en) * | 2010-12-14 | 2012-07-11 | 贵阳铝镁设计研究院有限公司 | Configuration structure for pole changing of DC (direct current) bus |
| CN102315841A (en) * | 2011-09-01 | 2012-01-11 | 上海电力学院 | Electrical fast transient burst discharge switch driver circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CB03 | Change of inventor or designer information |
Inventor after: Pan Jiangen Inventor after: Tu Xinya Inventor before: Pan Jiangen Inventor before: Tu Xinya |
|
| C56 | Change in the name or address of the patentee |
Owner name: HANGZHOU EVERFINE OPTOELECTRONIC INFORMATION CO., Free format text: FORMER NAME: HANGZHOU EVERFINE PHOTO-E-INFO CO., LTD. |
|
| CP01 | Change in the name or title of a patent holder |
Address after: 310053 Zhejiang province Hangzhou city Binjiang high tech Zone bin Kang Lu No. 9 Patentee after: Hangzhou Everfine Photo-E-Info Co., Ltd. Address before: 310053 Zhejiang province Hangzhou city Binjiang high tech Zone bin Kang Lu No. 9 Patentee before: Hangzhou Everfine Photo-E-Info Co., Ltd. |
|
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: Hangzhou Everfine Instrument Co., Ltd. Assignor: Hangzhou Everfine Photo-E-Info Co., Ltd. Contract record no.: 2011330000040 Denomination of utility model: Electric quick transition pulse group switch circuit Granted publication date: 20060927 License type: Exclusive License Record date: 20110212 |
|
| CX01 | Expiry of patent term |
Expiration termination date: 20150902 Granted publication date: 20060927 |
|
| EXPY | Termination of patent right or utility model |