WO2014139333A1

WO2014139333A1 - Current waveform generation device

Info

Publication number: WO2014139333A1
Application number: PCT/CN2014/070255
Authority: WO
Inventors: 杨直文; 刘宁; 杨波
Original assignee: 深圳市科威电子测试有限公司
Priority date: 2013-03-13
Filing date: 2014-01-07
Publication date: 2014-09-18
Also published as: CN203164242U

Abstract

Provided is a current waveform generation device, comprising: a high-voltage power supply (10), a bridge rectifier module (20), a waveform module (30), a discharging switch (40) and a test module (50). The waveform module (30) is provided with a charging end and a discharging end, wherein one end of the bridge rectifier module (20) is connected to the high-voltage power supply (10), the other end thereof is connected to the charging end of the waveform module (30), and the high-voltage power supply (10) is used for outputting a current to charge the waveform module (30); and the discharging end of the waveform module (30) is connected to one end of the discharging switch (40), the other end of the discharging switch (40) is connected to the test module (50), and the waveform module (30) is used for discharging to provide a test current waveform for the test module (50) when the discharging switch (40) is closed. According to the current waveform generation device, only one discharging switch (40) is used, the problem of trigger cooperation of the discharging switch (40) and a main loop does not exist, and the control is convenient, thereby improving the accuracy and reliability of triggering.

Description

Current waveform generating device

Technical field

The present invention relates to the field of electronic technologies, and in particular, to a current waveform generating device.

Background technique

Surge protector (SPD, Surge Protective Devices) test requires different lightning impulse waveforms such as 8/20uS, 10/350uS and combined wave. IEC61643-1:2005-03 "Low-voltage surge protectors - Part 1 : Surge protectors for low-voltage distribution systems" and GB 18802.1-2002 "Surge protectors for low-voltage distribution systems - Part 1: Performance Requirements and test methods, etc. use 10/350uS impulse current wave as SPD Class I classification test waveform. The amplitude and waveform of the output current of the lightning impulse long-current wave generator depend on its capacitor charging voltage, loop inductance and resistance, but in actual tests, the charging voltage of the capacitor cannot exceed the rated voltage of the capacitor, and the components of the loop are tolerant. The ability of voltage and high current is limited. The current of 10/350μs (long waveform) is longer due to the tail time, if its amplitude is 8/20μs (short waveform) The same, the energy is much larger than the 8/20μs wave. This type of inrush current wave circuit is produced at most, and is used at home and abroad as a "Crowbar circuit" and an inductor discharge circuit.

The inductance in the Crowbar circuit is determined by the equivalent resistance of the measured object, and the capacitance is limited by the peak current time. Large values cannot be used. Since the impedance value of the LC loop is very high, a very high charging voltage must be selected. When testing for high equivalent resistance components, the charging voltage is too high, resulting in high equipment costs, complicated circuit control, and economic considerations are also unreasonable.

Inductor discharge circuit uses the energy conversion principle to generate the inrush current, that is, the storage capacitor discharges to the waveform inductor, the electric field energy of the capacitor is converted into the magnetic field energy of the inductor, and then discharged by the waveform inductor, which is beneficial to reduce the energy storage device and The design requirements of the discharge ball gap are favorable for generating high energy 10/350μs surge current. However, the fast discharge circuit needs to solve two key technologies, one is the high voltage resistance of the fast discharge ball gap, and the other is the problem that the discharge switch is multiple, and the discharge switch and the main circuit are matched. If it cannot be properly matched, it cannot The required waveform is output, and the circuit control is very complicated.

Summary of the invention

The main object of the present invention is to provide a waveform generating device with high precision and reliability of triggering and simple control.

The invention provides a current waveform generating device, comprising a high voltage power supply, a bridge stack module, a waveform module, a discharge switch and a test module, wherein the waveform module is provided with a charging end and a discharging end, wherein:

The bridge stack module has one end connected to the high voltage power source and the other end connected to the charging end of the waveform module, and the high voltage power supply output current charges the waveform module;

a discharge end of the waveform module is connected to one end of the discharge switch, and the other end of the discharge switch is connected to the test module, and the waveform module performs discharge to provide the test module when the discharge switch is closed. Test the current waveform.

Preferably, the waveform module comprises a wave head sub-module, a middle segment sub-module and a wave tail sub-module, wherein:

The wave head submodule is configured to form a wave head of the test current waveform;

The middle segment sub-module is configured to form a middle segment transition of the test current waveform;

The tail submodule is used to form a tail of the test current waveform.

Preferably, the bridge stack module comprises a first bridge stack, a second bridge stack and a third bridge stack, the first bridge stack being connected between the wave head submodule and a high voltage power supply; the second bridge stack connection The third bridge stack is connected between the tail submodule and the high voltage power supply.

Preferably, the wave head sub-module includes a first capacitor, a first resistor and a first inductor, one end of the first capacitor is grounded, and the other end is respectively connected to one end of the first resistor and the first bridge stack; The other end of a resistor is connected to one end of the first inductor, and the other end of the first inductor is connected to the discharge switch.

Preferably, the middle sub-module includes a second capacitor, a second resistor, and a second inductor, one end of the second capacitor is grounded, and the other end is connected to one end of the second resistor and the second bridge respectively; The other end of the second resistor is connected to one end of the second inductor, and the other end of the second inductor is connected to the discharge switch.

Preferably, the middle segment sub-module is one or more.

Preferably, the wave tail sub-module includes a third capacitor, a third resistor and a third inductor, one end of the third capacitor is grounded, and the other end is respectively connected to one end of the third resistor and a third bridge stack; The other end of the third resistor is connected to one end of the third inductor, and the other end of the third inductor is connected to the discharge switch.

Preferably, the first bridge stack, the second bridge stack and the third bridge stack are rectifier diodes.

Preferably, the test module includes a test sample and an impedance matching resistor connected in series with the test sample, the discharge switch is connected to one end of the impedance matching resistor via the test sample, and the other end of the impedance matching resistor is grounded .

Preferably, the test sample is a surge protector.

The current waveform generating device of the invention uses only one discharge switch, and there is no trigger matching problem between the discharge switch and the main circuit, the control is very simple, and the accuracy and reliability of the trigger are improved; the wave head and the wave tail of the test current waveform can be Adjusted separately, the waveform adjustment space is very large, which reduces the difficulty of waveform debugging.

DRAWINGS

1 is a schematic structural view of an embodiment of a current waveform generating device of the present invention;

2 is a schematic structural view of another embodiment of a current waveform generating device of the present invention;

Fig. 3 is a circuit diagram showing still another embodiment of the current waveform generating device of the present invention.

The implementation, functional features, and advantages of the present invention will be further described in conjunction with the embodiments.

detailed description

It is understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

As shown in FIG. 1 , FIG. 1 is a schematic structural diagram of an embodiment of a current waveform generating device according to the present invention. The current waveform generating device of the embodiment includes a high voltage power supply 10, a bridge stack module 20, a waveform module 30, and a discharge switch 40. The test module 50 has a charging end and a discharging end. The bridge module 20 has one end connected to the high voltage power supply 10 and the other end connected to the charging end of the waveform module 30. The high voltage power supply 10 outputs current to the waveform module 30. Charging; the discharge end of the waveform module 30 is connected to one end of the discharge switch 40, and the other end of the discharge switch 40 is connected to the test module 50. When the discharge switch 40 is closed, the waveform module 30 performs discharge to provide a test current waveform to the test module 50. The waveform module 30 performs a discharge to provide a test current waveform to the test module 50 when the discharge switch 40 is closed. The specific operation mode of the current waveform generating device of the present invention is: the output current of the high voltage power supply 10 is rectified by the bridge stack module 20 and then sent to the waveform module 30 to charge the waveform module 30; when charging to the set voltage, the current is disconnected. The high voltage power supply 10; the discharge switch 40 is closed, the waveform module 30 is discharged, and the current waveform is output to the test module 50. The current waveform generating device of the present invention uses only one discharge switch 40, and there is no trigger matching problem between the discharge switch 40 and the main circuit, the control is very simple, and the accuracy and reliability of the trigger are improved.

Further, referring again to FIG. 2, FIG. 2 is a schematic structural view of another embodiment of the current waveform generating apparatus of the present invention. This embodiment may include all the technical solutions in the foregoing embodiments. The waveform module 30 includes a wave head sub-module 31, a middle segment sub-module 32 and a wave tail sub-module 33. The wave-head sub-module 31 is used to form a wave head of the test current waveform, and the middle segment Module 32 is used to form a mid-section transition of the test current waveform, and the tail sub-module 33 is used to form the tail of the test current waveform. The bridge stack module 20 includes a first bridge stack 21, a second bridge stack 22 and a third bridge stack 23, the first bridge stack 21 is connected between the wave head sub-module 31 and the high voltage power supply 10; the second bridge stack 22 is connected to the middle sub-module 32 is connected between the high voltage power supply 10; the third bridge stack 23 is connected between the wave tail submodule 33 and the high voltage power supply 10. The waveform formed by the specific wave head sub-module 31 is used as a wave head, and the waveform formed by the middle sub-module 32 is used as a mid-stage transition waveform, and the waveform formed by the wave tail sub-module 33 is used as a wave tail, and the wave head, the middle section transition and the wave tail are superposed to form a test current waveform. The middle segment sub-module 32 may be one or more. The number of the second bridge stacks 22 may correspond to the number of the middle section sub-modules 32, and are connected one by one. In this embodiment, the second bridge stack 22 and the middle segment sub-module 32 are taken as an example for description. The waveform module 30 of the current waveform generating device of the embodiment is divided into three parts: a wave head sub-module 31, a middle sub-module 32 and a wave tail sub-module 33. The adjusting wave-head sub-module 31 can adjust the wave head of the test current waveform and adjust the wave tail. The module 33 can adjust the tail of the test current waveform, and the middle section sub-module 32 can adjust the middle transition waveform of the test current waveform, and the wave head and the wave tail can be separately adjusted, and the waveform adjustment space is very large, which reduces the difficulty of waveform debugging.

Specifically, referring again to FIG. 3, FIG. 3 is a circuit diagram of still another embodiment of the current waveform generating apparatus of the present invention. This embodiment may include all the technical solutions in the foregoing embodiments. The wave head sub-module 31 includes a first capacitor C1, a first resistor R1, and a first inductor L1. One end of the first capacitor C1 is grounded, and the other end is respectively connected to the first resistor R1. One end of the first resistor R1 is connected to one end of the first inductor L1, and the other end of the first inductor L1 is connected to the discharge switch G. The middle sub-module 32 includes a second capacitor C2, a second resistor R2, and a second inductor L2. One end of the second capacitor C2 is grounded, and the other end is connected to one end of the second resistor R2 and the second bridge 22 respectively; the second resistor R2 The other end is connected to one end of the second inductor L2, and the other end of the second inductor L2 is connected to the discharge switch G. The wave tail sub-module 33 includes a third capacitor C3, a third resistor R3, and a third inductor L3. One end of the third capacitor C3 is grounded, and the other end is respectively connected to one end of the third resistor R3 and the third bridge stack 23; the third resistor R3 The other end of the third inductor L3 is connected to the other end of the third inductor L3, and the other end of the third inductor L3 is connected to the discharge switch G. The first bridge stack 21, the second bridge stack 22, and the third bridge stack 23 are rectifier diodes. In this embodiment, the first bridge stack 21 is the first diode D1, and the second bridge stack 22 is the second diode. D2, the third bridge stack 23 is a third diode D3. Of course, the first bridge stack 21, the second bridge stack 22, and the third bridge stack 23 can also be other rectifying devices. In this embodiment, the rectifying diodes are taken as an example for detailed description. The specific working principle of the current waveform generating device of this embodiment is as follows:

The first is the charging phase (the high voltage power supply 10 is in the working state, the discharge switch G is off), and the output current of the high voltage power supply 10 is rectified by the first diode D1, the second diode D2 and the third diode D3, respectively. After that, the first capacitor C1, the second capacitor C2, and the third capacitor C3 are respectively charged until the high voltage power supply 10 is turned off after being charged to the set voltage; then, the discharge phase (after the high voltage power supply 10 is turned off), the discharge is closed. The first capacitor C1 is discharged through the first resistor R1, the first inductor L1, the discharge switch G and the test module 50 to provide the test module 50 with the wave current of the test current waveform; the second capacitor C2 is passed through the second resistor R2. The second inductor L2, the discharge switch G and the test module 50 are discharged, and the test module 50 is provided with a middle transition current of the test current waveform, and the third capacitor C3 is passed through the third resistor R3, the third inductor L3, the discharge switch G and the test module. The discharge is performed 50 to provide the test module 50 with the tail current of the test current waveform. In this embodiment, the first capacitor C1, the second capacitor C2, and the third capacitor C3 are a wave head storage capacitor, a middle storage capacitor, and a tail storage capacitor, respectively; the first resistor R1, the second resistor R2, and the third Resistor R3 is a modulating resistor, and adjusting its parameters can change the waveform; the first inductor L1, the second inductor L2, and the third inductor L3 are modulating inductances, and adjusting their parameters can also change the waveform. In the embodiment, the middle sub-module 32 is taken as an example, and the middle sub-module 32 may also be multiple.

Specifically, in this embodiment, the test module 50 includes a test sample Rf and an impedance matching resistor Rs connected in series with the test sample Rf. The discharge switch G is connected to one end of the impedance matching resistor Rs via the test sample Rf, and the other end of the impedance matching resistor Rs Ground. The test sample Rf is a surge protector. The current waveform generating device of the embodiment can be specifically applied to the test of the surge protector. Compared with the existing test device, when the current waveform generating device in the embodiment is used for testing the electrophoresis protector, only one discharge switch G is used. The control is simple and easy to operate, and the multi-path waveform sub-module is superimposed to form a test current waveform, which does not require excessive voltage, and the high-voltage resistance of the device can be lower, thereby reducing the cost of components.

The above is only the preferred embodiment of the present invention, and is not intended to limit the scope of the invention, and the equivalent structure or equivalent process transformations made by the description of the invention and the drawings are directly or indirectly applied to other related The technical field is equally included in the scope of patent protection of the present invention.

Claims

A current waveform generating device, comprising: a high voltage power supply, a bridge stack module, a waveform module, a discharge switch and a test module, wherein the waveform module is provided with a charging end and a discharging end, wherein:

The bridge stack module has one end connected to the high voltage power source and the other end connected to the charging end of the waveform module, and the high voltage power supply output current charges the waveform module;

a discharge end of the waveform module is connected to one end of the discharge switch, and the other end of the discharge switch is connected to the test module, and the waveform module performs discharge to provide the test module when the discharge switch is closed. Test the current waveform.
The current waveform generating apparatus according to claim 1, wherein said test module comprises a test sample and an impedance matching resistor connected in series with said test sample, said discharge switch passing said test sample and said impedance matching resistor One end is connected, and the other end of the impedance matching resistor is grounded.
The current waveform generating apparatus according to claim 1, wherein the waveform module comprises a wave head submodule, a middle segment submodule, and a wave tail submodule, wherein:

The wave head submodule is configured to form a wave head of the test current waveform;

The middle segment sub-module is configured to form a middle segment transition of the test current waveform;

The tail submodule is used to form a tail of the test current waveform.
The current waveform generating apparatus according to claim 2, wherein said test module comprises a test sample and an impedance matching resistor connected in series with said test sample, said discharge switch passing said test sample and said impedance matching resistor One end is connected, and the other end of the impedance matching resistor is grounded.
The current waveform generating apparatus according to claim 3, wherein said bridge stack module comprises a first bridge stack, a second bridge stack and a third bridge stack, said first bridge stack being connected to said wave head submodule The second bridge stack is connected between the mid-segment sub-module and the high-voltage power supply; the third bridge stack is connected between the wave tail sub-module and the high-voltage power supply.
The current waveform generating apparatus according to claim 5, wherein said test module comprises a test sample and an impedance matching resistor connected in series with said test sample, said discharge switch passing said test sample and said impedance matching resistor One end is connected, and the other end of the impedance matching resistor is grounded.
The current waveform generating apparatus according to claim 6, wherein said first bridge stack, said second bridge stack, and said third bridge stack are rectifier diodes.
The current waveform generating device according to claim 5, wherein the wave head sub-module comprises a first capacitor, a first resistor and a first inductor, wherein one end of the first capacitor is grounded, and the other end is connected to the first One end of the resistor and the first bridge stack; the other end of the first resistor is connected to one end of the first inductor, and the other end of the first inductor is connected to the discharge switch.
The current waveform generating apparatus according to claim 8, wherein said test module comprises a test sample and an impedance matching resistor connected in series with said test sample, said discharge switch passing said test sample and said impedance matching resistor One end is connected, and the other end of the impedance matching resistor is grounded.
The current waveform generating apparatus according to claim 8, wherein said first bridge stack, said second bridge stack, and said third bridge stack are rectifier diodes.
The current waveform generating device according to claim 5, wherein the middle sub-module comprises a second capacitor, a second resistor and a second inductor, wherein one end of the second capacitor is grounded, and the other end is connected to the first One end of the two resistors and the second bridge stack; the other end of the second resistor is connected to one end of the second inductor, and the other end of the second inductor is connected to the discharge switch.
The current waveform generating apparatus according to claim 11, wherein said test module comprises a test sample and an impedance matching resistor connected in series with said test sample, said discharge switch passing said test sample and said impedance matching resistor One end is connected, and the other end of the impedance matching resistor is grounded.
The current waveform generating apparatus according to claim 11, wherein said first bridge stack, said second bridge stack, and said third bridge stack are rectifier diodes.
The current waveform generating apparatus according to claim 11, wherein said middle sub-module is one or more.
The current waveform generating apparatus according to claim 14, wherein said test module comprises a test sample and an impedance matching resistor connected in series with said test sample, said discharge switch passing said test sample and said impedance matching resistor One end is connected, and the other end of the impedance matching resistor is grounded.
The current waveform generating apparatus according to claim 14, wherein said first bridge stack, said second bridge stack, and said third bridge stack are rectifier diodes.
The current waveform generating device according to claim 5, wherein the tail submodule comprises a third capacitor, a third resistor and a third inductor, wherein one end of the third capacitor is grounded, and the other end is respectively connected to the One end of the third resistor and the third bridge stack; the other end of the third resistor is connected to one end of the third inductor, and the other end of the third inductor is connected to the discharge switch.
The current waveform generating apparatus according to claim 17, wherein said first bridge stack, said second bridge stack, and said third bridge stack are rectifier diodes.
The current waveform generating apparatus according to claim 17, wherein said test module comprises a test sample and an impedance matching resistor connected in series with said test sample, said discharge switch passing said test sample and said impedance matching resistor One end is connected, and the other end of the impedance matching resistor is grounded.
The current waveform generating apparatus according to claim 19, wherein said test sample is a surge protector.