CN212872582U

CN212872582U - Multi-parameter program-controlled adjustable dual-exponential-wave pulse current injection source circuit

Info

Publication number: CN212872582U
Application number: CN202020777083.6U
Authority: CN
Inventors: 刘政; 崔志同; 聂鑫; 吴伟; 陈伟; 王海洋
Original assignee: Northwest Institute of Nuclear Technology
Current assignee: Northwest Institute of Nuclear Technology
Priority date: 2020-05-12
Filing date: 2020-05-12
Publication date: 2021-04-02
Anticipated expiration: 2030-05-12

Abstract

The utility model provides a two index ripples pulse current injection source circuits of programme-controlled adjustable of multi-parameter. The main discharge loop in the circuit comprises a plurality of groups of charging capacitors connected in parallel and a plurality of groups of power inductors connected in parallel, the charging capacitors and the power inductors form a series connection relationship as a whole, and corresponding discharge switches are respectively and independently arranged on branches where the charging capacitors and the power inductors are arranged; and the other end of each group of power inductor is grounded together with the other ends of the plurality of groups of charging capacitors and the high-voltage negative input end of the main discharging loop after sequentially passing through the adjustable resistance module and the load. The utility model discloses accessible change over switch selects concrete return circuit to charge, realizes that each parameter of two index wave forms is adjustable, has promoted output pulse heavy current operating condition's flexibility greatly.

Description

Multi-parameter program-controlled adjustable dual-exponential-wave pulse current injection source circuit

Technical Field

The utility model relates to a two exponent number pulse current source circuit of infusing.

Background

The strong electromagnetic pulse environment such as high altitude electromagnetic pulse (HEMP), High Power Microwave (HPM), ultra wide band radiation (UWB), and thunder and lightning electromagnetic pulse (LEMP), Electrostatic Discharge (ED) in the natural environment have the characteristics of high electric field intensity, fast pulse leading edge, short duration and wide frequency spectrum range, and influence the electronic system through two modes of conduction coupling and radiation coupling, thereby causing interference or damage to the working state of the electronic system. The test means for researching the electromagnetic sensitivity of the electronic system comprises a radiation environment test and a current injection test, wherein the current injection test has low requirement on the test environment, does not need a large electromagnetic field radiation simulation device, is simple, convenient and practical in test and low in cost, and is an important means for testing the performance of the electronic system.

At present, most of pulse current injection sources are in a single mode, and an output waveform is easy to distort when a terminating load changes, so in order to simulate a pulse current equivalent to a radiation environment induced current, specific waveform index parameters (mainly a leading edge, a half width and a peak value) influencing an electronic system need to be designed, and a parameter program control adjustable double-exponential pulse current injection source needs to be designed.

SUMMERY OF THE UTILITY MODEL

The utility model mainly aims at providing a two exponential ripples pulsed current injection source circuit of multi-parameter programme-controlled adjustable.

In order to achieve the above object, the present invention provides the following technical solutions:

the utility model provides a two exponential wave pulse current injection source circuits of multi-parameter programme-controlled adjustable which characterized in that: the high-voltage power supply comprises a high-voltage power supply, a main discharge loop and an adjustable resistance module; the high-voltage positive and negative output ends of the high-voltage power supply are respectivelyThe positive and negative input ends of the charging capacitor of the main discharging loop are connected; the main discharging loop comprises a plurality of groups of charging capacitors and a plurality of groups of power inductors which are connected in parallel, the charging capacitors and the power inductors are integrally connected in series, and corresponding discharging switches (S11, S12 … … S15, S21, S22 … … S25) are respectively and independently arranged on branches where the charging capacitors and the power inductors are located; the other end of each group of the power inductors is grounded together with the other ends of the plurality of groups of the charging capacitors and the high-voltage negative input end of the main discharging loop after sequentially passing through the adjustable resistance module and the load; a branch circuit is led out from the junction between the multiple groups of power inductors and the adjustable resistance module and passes through the sharpening capacitor C_pAnd switch S3 is connected to ground.

Each group of the charging capacitors and the power inductors can be one component, and can also be a plurality of same components connected in parallel or in series.

Furthermore, the circuit is also provided with a load measuring module (such as an impedance tester) for measuring load parameters, and the load parameters and the output waveform index are required to be used as the basis for configuring loop resistance, inductance and capacitance together. In this way, the output waveform can be kept constant while the load is varied. Of course, if the load parameters are known, no further measurements need to be made by the load measurement module.

Further, the capacitor C is steeped_pAnd the device types of the discharge switch, the isolating switch, the switch S3 and the adjustable resistance module are selected, so that the waveform distortion caused by the increase of self-inductance caused by the integration of a main loop is eliminated.

Furthermore, the capacitance of the charging capacitors is different, and the inductance of the power inductors is different. According to the requirement, one path of capacitor and one path of inductor can be conducted independently, and a plurality of groups of switches can be closed to realize the conduction of a plurality of paths of parallel capacitors and a plurality of paths of parallel inductors.

Further, the circuit is also provided with a current measuring sensor which is used for detecting an output current signal of the load end and converting the output current signal into a voltage signal.

Furthermore, the circuit is also provided with a digital storage oscilloscope, and the signal input end of the digital storage oscilloscope is coupled with the signal output end of the current measuring sensor through an optical fiber.

Furthermore, the main discharge loop is arranged in the high-voltage cabinet, the adjustable resistance module is arranged outside the high-voltage cabinet in an adjustable common resistance mode, and resistance adjustment is achieved through a mechanical rotary table controlled by an electromagnetic valve.

Furthermore, the discharge switch is a vacuum high-voltage switch with the direct-current withstand voltage of more than 20kV, and the inductance of the discharge switch is about 50 nH.

The utility model has the advantages of it is following:

the utility model discloses a double-exponential ripples pulse current injection source circuit adopts a new circuit topology structure, adopts different electric capacity and resistance to constitute the return circuit that discharges promptly, selects specific return circuit to charge through high-pressure change over switch (isolator, discharge switch). In addition, in consideration of the fact that the parameters of the output waveform still need to be guaranteed under the condition that the external load changes, the problem of large loop inductance can be avoided by leading out the outside of the high-voltage cabinet in a mode of being independent of a common resistor outside the main discharge loop, and the flexibility of the equipment is greatly improved. Through the circuit topological structure, the adjustability of each parameter of the double-exponential waveform can be realized (the output waveforms required by different indexes under the same load condition are realized, and the output waveforms are kept unchanged when the load is changed under the same output waveform index requirement), so that the flexibility of the working state of outputting the pulse large current is greatly improved.

The utility model discloses be particularly useful for 20kV and above high-voltage pulse current injection source, wherein adopt sharpening electric capacity and low inductance components and parts (resistance, switch etc.) can eliminate the major loop and integrate and bring the problem that the self-inductance increases and lead to wave form distortion.

Drawings

Fig. 1 is a schematic diagram of a dual-exponential pulse waveform (single pulse).

Fig. 2 is a schematic diagram of a typical application system of the present invention.

FIG. 3 is a schematic diagram of a specific topology of an embodiment.

Detailed Description

The present invention will be described in detail below by way of examples with reference to the accompanying drawings.

The embodiment provides a multi-parameter programmable and adjustable dual-exponential-wave pulse current injection source circuit, wherein the parameters mainly refer to the peak value, the leading edge and the half width of the dual-exponential-wave pulse current. The specific definition can be seen in fig. 1:

peak, i.e. current value of 100% of the ordinate in the figure;

leading edge, i.e., the time from 10% peak to 90% peak;

half-width, i.e., the time from 50% of the peak before the peak to 50% of the peak after the peak.

The multi-parameter program-controlled adjustable dual-exponential-wave pulse current injection source circuit is combined with a control unit, a program-controlled terminal and the like to form a system, and the relationship among all functional parts is shown in figure 2:

1) injecting a source main loop: the injection source main loop is designed based on an RLC loop, is reliable, stable and easy to control, adopts different structural loops at different voltage levels, and has the design requirements that: the loop inductance is reduced as much as possible, the structure is compact as much as possible, the structural design needs to avoid the influence of distribution parameters, and the loop devices are selected on the basis of high voltage resistance, extremely low inductance and small size. For the high voltage injection source loop, it is preferably placed in a high insulation gas container.

2) A control unit: the logic and signal processing functions of the whole system are completed by adopting a mode of a programmable controller and a digital/analog (analog/digital) unit.

3) Numerical control high voltage power supply: the high-frequency high-voltage power supply controlled by a digital quantity is adopted, the volume is small, the safety is high, the high-frequency high-voltage power supply is directly output to the injection source main circuit through a high-voltage wire, and special isolation protection measures can be added for preventing the influence of pulse current on a numerical control high-voltage source; in addition, a capacitance voltage acquisition unit is correspondingly configured: the charging voltage acquisition circuit is used for acquiring the charging voltage of each group of charging capacitors in the injection source main loop, and the control unit adjusts the output of the high-voltage power supply according to the charging voltage.

4) And the load measuring module (such as an impedance tester) is used for measuring load parameters and sending the load parameters to the control unit, and the control unit controls loop parameters (capacitance, resistance and inductance) injected into the main circuit of the source according to the load parameters so as to keep the output waveform unchanged when the load changes.

5) A current measuring sensor: and converting the injection source current output signal into a voltage signal which can be identified by an oscilloscope.

6) A digital storage oscilloscope: and receiving signals transmitted by the current measuring sensor, displaying and recording the signals, and uploading the signals to the program control terminal.

7) And (3) program-controlled terminal: a user can issue an instruction to the control unit through the program-controlled terminal, and obtain data uploaded by the digital storage oscilloscope, so that the program-controlled adjustable function is realized. The scheme of a large-screen display and an industrial control computer can be adopted, detection, setting and action of all control functions and measurement functions can be completed, an emergency stop unit is arranged beside a human-computer interface, and when emergency conditions (such as wrong charging voltage display and abnormal discharging) occur, the numerical control high-voltage source power supply can be cut off by pressing an emergency stop switch.

The specific topology of the multiparameter program-controlled adjustable dual-exponential-wave pulse current injection source circuit and the system thereof in the embodiment is shown in fig. 3:

the high-voltage positive input end + HV and the high-voltage negative input end-HV of the main discharge loop are connected with the corresponding high-voltage positive and negative output ends of the high-voltage power supply; the main discharging loop comprises five charging capacitors C1-C5 connected in parallel and five power inductors L1-L5 connected in parallel, the five charging capacitors and the five power inductors form a series connection relation integrally, and corresponding discharging switches S11-S15 and S21-S25 are respectively and independently arranged on branches where each charging capacitor and each power inductor are located; the other end of each charging capacitor is connected with the other end of each power inductor through an adjustable resistance module and a load in sequence and then is grounded together with the other end of each charging capacitor and the high-voltage negative input end of the main discharging loop; five functionsA branch is led out from the junction between the rate inductor and the adjustable resistance module and is steeped by a capacitor C_pAnd switch S3 is connected to ground.

The trigger switches (including isolating switches and discharging switches) in the main discharging loop adopt different high-voltage switches according to different voltage grades, and require small discharging gaps (small conduction inductance), stability and reliability; the discharge switch is a vacuum high-voltage switch with direct-current withstand voltage up to 20kV, and the inductance of the discharge switch is about 50 nH.

The loop resistor (adjustable resistor module) is clearly divided from the main discharge loop in terms of topological structure and installation position, the common resistor mode is adopted to lead out the outside of the high-voltage cabinet, and the resistance adjustment can be realized by adopting a mechanical turntable controlled by an electromagnetic valve.

Sharpening capacitor C_pThe pulse source is mainly used for generating a pulse waveform with the leading edge less than 10ns, because the pulse source integrates a plurality of groups of circuit elements, the stray inductance of the pulse source is high, and when a fast leading edge waveform is generated, a sharpening capacitor C needs to be connected_p。

The control unit controls the isolating switch S₀₁～S₀₅Different charging capacitors are selected according to the on-off state of the charging circuit, the on-off states of the discharging switches S11-S15 and S21-S25 are controlled simultaneously, and loop parameters (capacitance, resistance and inductance) are determined finally; in the main discharge loop, except multiple groups of capacitors, inductors, resistors, isolating switches, discharge switches and sharpening capacitors C_pIn addition, the circuit also comprises a stray inductance (L) of the loop₀、L_p) And the like.

The communication between the program control terminal and the control unit and the communication between the program control terminal and the digital storage oscilloscope are isolated by adopting the optical fiber isolation module, so that on one hand, the absolute safety of a tester is ensured (no electric connection with an injection source loop), and on the other hand, the digital storage oscilloscope is also in a complete isolation state (the independent UPS is adopted for supplying power), and the accuracy and the safety of measurement are ensured. The optical fiber communication between the program control terminal and the control unit adopts a mode of 'serial port communication optical fiber transceiver' + 'single mode optical fiber', the communication between the program control terminal and the digital storage oscilloscope adopts a mode of 'RJ 45 network port optical fiber transceiver' + 'single mode optical fiber', and an industrial control computer directly accesses the oscilloscope through an IP address and can also adopt a mode of 'usb + optical isolation module' for communication.

According to the total resistance R, the total inductance L and the total capacitance C (including the sharpening capacitance C) of the main discharge loop_p) The time-domain function of the pulse current i can be expressed by the following formula, and the corresponding leading edge and half width can be obtained from the waveform:

the parameters of the leading edge time, the half-peak time and the current output range of the dual-exponential pulse waveform are programmable and adjustable, and the specific parameters are shown in tables 1 and 2.

Table 1: waveform parameters

Table 2: double exponential pulse waves of different parameters (oscilloscope data)

Serial number	R_L(Ω)	R(Ω)	L(nH)	C(F)	Cp(F)	Front edge tr (ns)	Half width tw (ns)	Peak (A)
									1	50	16	180	6600p	100p	10	200	100
2	50	16	180	6600p	100p	10	200	200
									3	50	16	160	15.6n	66p	10	500	100
4	50	16	160	15.6n	66p	10	500	200
									5	50	16	300	3700p	200p	20	200	100
6	50	16	300	3700p	200p	20	200	200
									7	50	16	320	12.7n	200p	20	500	100
8	50	16	320	12.7n	200p	20	500	200
									9	100	16	180	5600p	100p	10	200	100
10	100	16	180	5600p	100p	10	200	200
									11	100	16	180	12.7n	100p	10	500	100
12	100	16	180	12.7n	100p	10	500	200
									13	100	16	320	3700p	200p	20	200	100
14	100	16	320	3700p	200p	20	200	200
									15	100	16	300	8500p	200p	20	500	100
16	100	16	300	8500p	200p	20	500	200
									17	50	32	180	5600p	100p	10	200	100
18	50	32	180	5600p	100p	10	200	200
									19	50	32	160	15.6n	66p	10	500	100
20	50	32	160	15.6n	66p	10	500	200
									21	50	32	320	3700p	200p	20	200	100
22	50	32	320	3700p	200p	20	200	200
									23	50	32	300	10.2n	200p	20	500	100
24	50	32	300	10.2n	200p	20	500	200
									25	100	32	180	5600p	100p	10	200	100
26	100	32	180	5600p	100p	10	200	200
									27	100	32	160	10.2n	100p	10	500	100
28	100	32	160	10.2n	100p	10	500	200
									29	100	32	320	3700p	200p	20	200	100
30	100	32	320	3700p	200p	20	200	200
									31	100	32	300	8500p	200p	20	500	100
32	100	32	300	8500p	200p	20	500	200

Note: an oscilloscope: tektronix TDS3032B, bandwidth 300M, sample rate: 2.5 GS/s; a current sensor: PEARSON 6600; multiplying power: 10:1.

The present embodiment can also combine with a conventional square wave injection source circuit and an oscillation wave injection source circuit to form a multi-waveform parameter program-controlled adjustable pulse current injection system, and different waveform pulse injection sources are connected through an optical fiber and receive remote control computer program-controlled adjustment of pulse current waveform selection and parameter adjustment through a control cabinet. The parameters of the leading edge time, the half-peak time and the current output range of the dual-exponential pulse waveform are programmable and adjustable, the frequency of the damped oscillation wave is adjustable, and the pulse width of the square wave is adjustable.

Claims

1. The utility model provides a two exponential wave pulse current injection source circuits of multi-parameter programme-controlled adjustable which characterized in that: the high-voltage power supply comprises a high-voltage power supply, a main discharge loop and an adjustable resistance module; the high-voltage positive and negative output ends of the high-voltage power supply are respectively connected with the positive and negative input ends of the charging capacitor of the main discharging loop; the main discharging loop comprises a plurality of groups of charging capacitors and a plurality of groups of power inductors which are connected in parallel, the charging capacitors and the power inductors form a series connection relationship as a whole, and corresponding discharging switches are respectively and independently arranged on branches where the charging capacitors and the power inductors are arranged; the end of each group of charging capacitor connected with the multiple groups of power inductors is also divided into an independent branch circuit which is connected to the high-voltage positive input end of the main discharging loop through a corresponding isolating switch, and the other ends of the multiple groups of power inductors sequentially pass through the adjustable resistance module and the load and then are connected to the high-voltage positive input end of the main discharging loopThe other ends of the charging capacitors and the high-voltage negative input end of the main discharging loop are grounded together; a branch circuit is led out from the junction between the multiple groups of power inductors and the adjustable resistance module and passes through the sharpening capacitor C_pAnd switch S3 is connected to ground.

2. The multiparameter program-controlled adjustable dual-exponential-wave pulse current injection source circuit according to claim 1, wherein: and the load measuring module is also configured and used for measuring load parameters, and the load parameters and the output waveform index are required to be used as the basis for configuring loop resistance, inductance and capacitance together.

3. The multiparameter program-controlled adjustable dual-exponential-wave pulse current injection source circuit according to claim 1, wherein: sharpening capacitor C_pAnd the device types of the discharge switch, the isolating switch, the switch S3 and the adjustable resistance module are selected, so that the waveform distortion caused by the increase of self-inductance caused by the integration of a main loop is eliminated.

4. The multiparameter program-controlled adjustable dual-exponential-wave pulse current injection source circuit according to claim 1, wherein: the capacitance of the charging capacitors is different, and the inductance of the power inductors is different.

5. The multiparameter program-controlled adjustable dual-exponential-wave pulse current injection source circuit according to claim 1, wherein: and a current measuring sensor is also arranged and used for detecting an output current signal of the load end and converting the output current signal into a voltage signal.

6. The multi-parameter programmable and adjustable dual-exponential-wave pulse current injection source circuit according to claim 5, wherein: and a digital storage oscilloscope is also arranged, and the signal input end of the digital storage oscilloscope is coupled with the signal output end of the current measuring sensor through an optical fiber.

7. The multiparameter program-controlled adjustable dual-exponential-wave pulse current injection source circuit according to claim 1, wherein: the main discharge loop is arranged in the high-voltage cabinet, the adjustable resistance module is arranged outside the high-voltage cabinet in an adjustable common resistance mode, and resistance adjustment is achieved through a mechanical rotary table controlled by an electromagnetic valve.

8. The multiparameter program-controlled adjustable dual-exponential-wave pulse current injection source circuit according to claim 1, wherein: the discharge switch is a vacuum high-voltage switch with over 20kV direct-current withstand voltage, and the self-structure inductance of the discharge switch is 50 nH.