CN111458543A - PCB board level test combined wave generator controlled by mercury switch - Google Patents
PCB board level test combined wave generator controlled by mercury switch Download PDFInfo
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- CN111458543A CN111458543A CN202010307749.6A CN202010307749A CN111458543A CN 111458543 A CN111458543 A CN 111458543A CN 202010307749 A CN202010307749 A CN 202010307749A CN 111458543 A CN111458543 A CN 111458543A
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- combined wave
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/28—Provision in measuring instruments for reference values, e.g. standard voltage, standard waveform
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/30—Structural combination of electric measuring instruments with basic electronic circuits, e.g. with amplifier
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/001—Measuring interference from external sources to, or emission from, the device under test, e.g. EMC, EMI, EMP or ESD testing
- G01R31/002—Measuring interference from external sources to, or emission from, the device under test, e.g. EMC, EMI, EMP or ESD testing where the device under test is an electronic circuit
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/14—Circuits therefor, e.g. for generating test voltages, sensing circuits
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/28—Testing of electronic circuits, e.g. by signal tracer
- G01R31/2801—Testing of printed circuits, backplanes, motherboards, hybrid circuits or carriers for multichip packages [MCP]
- G01R31/2818—Testing of printed circuits, backplanes, motherboards, hybrid circuits or carriers for multichip packages [MCP] using test structures on, or modifications of, the card under test, made for the purpose of testing, e.g. additional components or connectors
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Electromagnetism (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- General Engineering & Computer Science (AREA)
- Testing Electric Properties And Detecting Electric Faults (AREA)
Abstract
The invention discloses a PCB (printed circuit board) level test combined wave generator controlled by a mercury switch, belonging to a waveform generating device. The equipment comprises a 0-100V direct-current voltage generating circuit, an energy storage circuit, a mercury wet reed switch, a combined wave forming loop, waveform detection equipment and a working platform printed circuit board, wherein the connection relationship is as follows: the input end of the energy storage circuit is connected with a direct-current voltage generating circuit, the mercury wet spring switch is connected with the energy storage circuit and a combined wave forming loop, and the output end of the combined wave generator forming loop is connected with waveform detection equipment; after the direct-current voltage generating circuit charges the energy storage circuit, the energy storage circuit forms a loop to discharge to the combined wave through the mercury wet reed switch to generate the combined wave for testing a PCB (printed circuit board) level small surge protection device, and the waveform detection equipment is used for detecting the generated combined wave.
Description
Technical Field
The invention belongs to the technical field of waveform generators, and particularly relates to a PCB (printed circuit board) level test combined wave generator controlled by a mercury switch.
Background
With the continuous development of semiconductor technology and electronic technology, electronic devices are gradually miniaturized and highly integrated, which leads to the improvement of electromagnetic sensitivity of electronic components and the continuous decline of overvoltage resistance. Transient overvoltage (or current) caused by electrostatic discharge, switching, and operation overvoltage can cause direct or indirect damage to electronic devices and semiconductor devices. Surge protection devices are widely used in electrical circuits to protect the circuit due to their ability to limit overvoltage and current discharge. Therefore, the performance of the electronic equipment and the protective device when suffering surge (surge) overvoltage is checked through surge (surge) immunity test, and the safe use of the equipment is guaranteed. In the field of electromagnetic compatibility EMC, a single polarity surge analog generator due to switching and transient over-voltages is called a Combined Wave Generator (CWG). The standard shock wave of the combined wave generator is defined by an open-circuit voltage waveform and a short-circuit current waveform, wherein the wave front time of the open-circuit voltage is 1.2us, and the half-peak time of the open-circuit voltage is 50 us; short circuit current wave front time 8us, short circuit half peak time 20 us. The voltage grade of the existing combined wave generator is generally two hundred volts to dozens of kilovolts, but the lowest breakdown voltage of a PCB-level surge protection device can reach dozens of volts or even several volts, and the clamping voltage is only about dozens of volts, so that the existing combined wave generator is inconvenient to be used for impact testing of the PCB-level surge protection device, and the design and application in the aspect of low voltage grade need to be improved.
Disclosure of Invention
The invention aims to solve the technical problem that the existing combined wave generator is inconvenient to use for impact testing of surge protection devices such as PCB board level, and in order to solve the technical problem, the invention provides a simple low-voltage PCB board level 1.2/50us and 8/20us simple test combined wave generator which has simple circuit, stable performance, safety and reliability, and the equipment takes a printed circuit board as a waveform generation platform and can generate combined waves with the voltage (current) level of 0-100V (50A) and the output impedance of 2 omega. Design of PCB (printed Circuit Board) level 1.2/50us and 8/20us test combined wave generator with voltage level of 0-100V
In order to solve the technical problems, the invention adopts the following technical scheme:
a PCB board level test combined wave generator controlled by a mercury switch comprises a 0-100V direct current voltage generating circuit, an energy storage circuit, a mercury wet spring switch, a combined wave forming loop, waveform detection equipment and a working platform printed circuit board, wherein the connection relationship is as follows: the input end of the energy storage circuit is connected with a direct-current voltage generating circuit, the mercury wet spring switch is connected with the energy storage circuit and a combined wave forming loop, and the output end of the combined wave generator forming loop is connected with waveform detection equipment; after the direct-current voltage generating circuit charges the energy storage circuit, the energy storage circuit forms a loop to discharge to the combined wave through the mercury wet reed switch to generate the combined wave for testing the low-voltage PCB board-level surge protection device, and the waveform detection equipment is used for detecting the generated combined wave.
Further, the waveform generation platform of the PCB board level test combination wave generator is a printed circuit board.
Further, the 0-100V direct current voltage generating circuit is an adjustable direct current voltage source.
Further, the energy storage circuit comprises a rectifier diode, a charging resistor and a high-voltage energy storage pulse capacitor.
Furthermore, the mercury wet spring switch is a magnetic control switch, and the on-off of the mercury wet spring switch is controlled by a magnet.
Further, the combined wave forming loop comprises an inductor and three resistors.
Further, the waveform detection circuit is an oscilloscope.
The invention has the technical effects that:
the circuit of the invention has simple design, convenient construction, stable performance and convenient operation.
The working platform is a printed circuit board, the voltage grade of the combined wave waveform is 0-100V (current is 0-50A), and the device is suitable for measuring a PCB (printed circuit board) grade low-voltage surge protection device.
The switch is a mercury wet spring switch, has high sensitivity, quick response and convenient control, and the on-off reed filled with mercury is almost free from shaking.
Drawings
FIG. 1 is a schematic structural view of the present invention;
fig. 2 is a schematic circuit diagram of the present invention.
Detailed Description
The present invention is further described below in conjunction with the following figures and specific examples so that those skilled in the art may better understand the present invention and practice it, but the examples are not intended to limit the present invention.
The inventor finds that the voltage grade of the existing combined wave generator is generally two hundred volts to dozens of kilovolts, but the breakdown voltage of a PCB-level surge protection device can reach dozens of volts or even several volts at the lowest, and the clamping voltage is only about dozens of volts, so that the existing combined wave generator is inconvenient to be used for impact testing of the PCB-level low-voltage surge protection device, and the design and application in the aspect of low voltage grade need to be improved; meanwhile, the existing combined wave generator is high in price, large in size, complex in structure and inconvenient in test process aiming at PCB board-level devices.
In order to solve the problems, the invention provides a low-voltage PCB level 1.2/50us and 8/20us simple test combined wave generator which has simple circuit, stable performance, safety and reliability, and the device takes a printed circuit board as a waveform generation platform and can generate a combined wave with the voltage (current) level of 0-100V (50A) and the output impedance of 2 omega. That is, the invention is a design scheme of a PCB level 1.2/50us and 8/20us test combined wave generator with a voltage level of 0-100V.
In order to solve the technical problems, the invention adopts the following technical scheme:
the structure of the PCB board level combined wave generator controlled by the mercury switch is shown in figure 1, and comprises a 0-100V direct current voltage generating circuit, an energy storage circuit, a mercury wet spring switch, a combined wave forming loop, waveform detection equipment and a working platform printed circuit board, wherein the connection relationship is as follows: the input end of the energy storage circuit is connected with a direct-current voltage generating circuit, the mercury wet spring switch is connected with the energy storage circuit and a combined wave forming loop, and the output end of the combined wave generator forming loop is connected with waveform detection equipment; after the direct-current voltage generating circuit charges the energy storage circuit, the energy storage circuit forms a loop to discharge to the combined wave through the mercury wet reed switch to generate the combined wave for testing the low-voltage PCB board-level surge protection device, and the waveform detection equipment is used for detecting the generated combined wave.
The waveform generation platform of the PCB board level test combined wave generator is a printed circuit board.
The 0-100V direct-current voltage generating circuit is an adjustable direct-current voltage source.
The energy storage circuit comprises a rectifier diode, a charging resistor and a high-voltage energy storage pulse capacitor.
The mercury wet spring switch is a magnetic control switch, and the on-off of the mercury wet spring switch is controlled by a magnet.
The combined wave forming loop comprises an inductor and three resistors.
Wherein, the waveform detection circuit is an oscilloscope.
The invention has the technical effects that:
the circuit of the invention has simple design, convenient construction, stable performance and convenient operation.
The working platform is a printed circuit board, the voltage grade of the combined wave waveform is 0-100V (current is 0-50A), and the device is suitable for measuring a PCB (printed circuit board) grade low-voltage surge protection device.
The switch is a mercury wet spring switch, has high sensitivity, quick response and convenient control, and the on-off reed filled with mercury is almost free from shaking.
The PCB board level combined wave generator controlled by the mercury switch is described in detail in the following with reference to the attached figure 2:
the circuit schematic diagram of the PCB board-level combined wave generator controlled by the mercury switch is shown in FIG. 2, wherein the direct-current voltage source is 220V power-frequency alternating-current voltage input, and 0-100V continuously adjustable direct-current voltage output;
the energy storage circuit (as a dotted line frame I in the figure) is mainly composed of a rectifier diode D, a current limiting resistor R and a high-voltage energy storage pulse capacitor C. The direct-current voltage source charges the energy storage capacitor C after passing through the current-limiting resistor R, the output voltage of the direct-current voltage source can be adjusted, the energy storage capacitor C can be charged to a specified voltage, the direct-current voltage source is disconnected after the charging is finished, and the rectifier diode D is used for preventing damage caused by simultaneous charging and discharging of the energy storage circuit;
the mercury wet reed switch is a high-voltage magnetic control switch, the outer part of the mercury wet reed switch is packaged by a sealed glass tube, the inner part of the mercury wet reed switch is filled with mercury, and the switch can be controlled to be closed by controlling the movable reed to attract the static reed by using a magnet, so that the on-off of a circuit is controlled to enable an energy storage circuit to generate circuit discharge to a combined wave; the switch has small volume, high sensitivity, quick response and almost no jitter when the switch is switched on and off;
the combined wave generating circuit (as shown in the figure)Dotted line frame II) is composed of a non-inductive winding resistor Rm、Rs1、Rs2And single layer air coil LrAnd (4) combining. After the mercury wet reed switch is switched on, the electric energy is combined with the wave form to form a network, and the energy storage capacitor C and the resistor R are connectedm、Rs1、Rs2And an inductance LrUnder the action of the combined wave forming network, the combined wave pulse waveform is output at the output end of the combined wave forming network. Wherein R ism＝1.3Ω、Rs1＝10Ω、Rs2＝2Ω、Lr＝10uH、C＝9.4uF。
When the output end is open-circuited, the pulse voltage waveform is 1.2/50 us; when the output is short circuited, a pulse current waveform 8/20us can be obtained. The amplitude range of the output pulse voltage is 0-100V; the amplitude of the output pulse current ranges from 0 to 50A.
Therefore, the low-voltage PCB level 1.2/50us and 8/20us simple test combined wave generator has the advantages of simple circuit, stable performance, safety and reliability, and can generate combined waves with the voltage (current) level of 0-100V (50A) and the output impedance of 2 omega by using the printed circuit board as a waveform generation platform. The voltage grade of the combined wave waveform is 0-100V (current is 0-50A), and the combined wave waveform is suitable for measuring a PCB (printed circuit board) grade low-voltage surge protection device.
In the description, each part is described in a progressive manner, each part is emphasized to be different from other parts, and the same and similar parts among the parts are referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (5)
1. Adopt mercury switch control's PCB board level test combination wave generator, its characterized in that: the device comprises a 0-100V voltage forming circuit, an energy storage circuit, a mercury wet spring switch, a combined wave forming loop, waveform detection equipment and a working platform printed circuit board. After the 0-100V voltage forming circuit charges the energy storage circuit, the energy storage circuit is connected to a combined wave forming loop through a mercury wet reed switch to generate combined waves for testing a low-voltage PCB (printed circuit board) level surge protection device, and the waveform detection equipment is connected with the output end of the combined wave generating loop to detect and verify the generated combined waves. The energy storage circuit, the mercury wet spring switch and the combined wave generating loop are welded on the printed circuit board.
2. The method of claim 1, wherein the waveform generation stage of the PCB board level test wave generator is a printed circuit board.
3. The method of claim 1, wherein the tank circuit comprises a rectifier diode, a charging resistor, and a high voltage tank capacitor.
4. The method of claim 1, wherein the mercury reed switch is a magnetic switch, and a magnet is used to control the on/off.
5. The method of claim 1, wherein the combined wave forming loop comprises a single layer air core inductor and three non-inductive wire wound resistors.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010307749.6A CN111458543A (en) | 2020-04-17 | 2020-04-17 | PCB board level test combined wave generator controlled by mercury switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010307749.6A CN111458543A (en) | 2020-04-17 | 2020-04-17 | PCB board level test combined wave generator controlled by mercury switch |
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| Publication Number | Publication Date |
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| CN111458543A true CN111458543A (en) | 2020-07-28 |
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| CN202010307749.6A Pending CN111458543A (en) | 2020-04-17 | 2020-04-17 | PCB board level test combined wave generator controlled by mercury switch |
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Citations (10)
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2020
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| CN205318192U (en) * | 2016-01-04 | 2016-06-15 | 西北师范大学 | Industry monitored control system based on ethernet |
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| CN106645865A (en) * | 2016-09-19 | 2017-05-10 | 中国电力科学研究院 | Device for measuring corona current of high-voltage transmission line |
| CN206114884U (en) * | 2016-10-14 | 2017-04-19 | 国家电网公司 | Arrester counter calibration equipment |
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Application publication date: 20200728 |
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