CN214150903U - CS101 test system suitable for GJB151 standard - Google Patents
CS101 test system suitable for GJB151 standard Download PDFInfo
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- CN214150903U CN214150903U CN202023016770.5U CN202023016770U CN214150903U CN 214150903 U CN214150903 U CN 214150903U CN 202023016770 U CN202023016770 U CN 202023016770U CN 214150903 U CN214150903 U CN 214150903U
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Abstract
The utility model relates to a CS101 test system suitable for GJB151 standard, including power amplifier, power amplifier protection device and coupling transformer; the power amplifier protection device comprises a program control switch group electrically connected with the controller and a filter circuit connected with a second end of the program control switch group, wherein a second end of the filter circuit is electrically connected with a primary circuit of the coupling transformer through a current limiting circuit, and a first end of the program control switch group is electrically connected with an output end of the power amplifier through a voltage dividing circuit. The utility model provides a CS101 test system suitable for GJB151 standard can protect the power amplifier output to avoid the transient disturbance stress, has reduced the power amplifier fault rate, has ensured test system's reliability, promotes power amplifier output's utilization ratio, has satisfied the practical application demand.
Description
Technical Field
The utility model relates to an electromagnetic compatibility tests from equipment technical field, especially relates to a CS101 test system suitable for GJB151 standard.
Background
The CS 10125 Hz-150 kHz power line conduction sensitivity is a critical item in the GJB151 standard, and the objective is to verify the ability of EUT (device under test) to withstand the signal coupled to the input power line, ensuring that device performance is not degraded under pulsating voltage conditions that allow distortion of the power supply voltage waveform. However, the test system bears the power frequency interference, transient impact and other stresses introduced by the EUT power supply system in the test process, which is very easy to cause the fault of the test system, especially the fault of the active power amplifier.
SUMMERY OF THE UTILITY MODEL
In order to solve the above problem, the present invention provides a CS101 test system applicable to the GJB151 standard, which can reduce the failure rate of the detection device and the system and improve the product detection efficiency.
A CS101 test system suitable for GJB151 standard comprises a power amplifier, a power amplifier protection device and a coupling transformer; the power amplifier protection device comprises a program control switch group electrically connected with the controller and a filter circuit connected with a second end of the program control switch group, wherein a second end of the filter circuit is electrically connected with a primary circuit of the coupling transformer through a current limiting circuit, and a first end of the program control switch group is electrically connected with an output end of the power amplifier through a voltage dividing circuit.
In addition, according to the utility model provides a CS101 test system suitable for GJB151 standard can also have following additional technical characteristics:
furthermore, the program-controlled switch group comprises a first program-controlled switch and a second program-controlled switch.
Further, the voltage dividing circuit comprises a first voltage dividing resistor and a second voltage dividing resistor; a first end of the first divider resistor is electrically connected with a third end of the power amplifier, and a second end of the first divider resistor is electrically connected with a first end of the first program-controlled switch; and the first end of the second voltage-dividing resistor is electrically connected with the fourth end of the power amplifier, and the second end of the second voltage-dividing resistor is electrically connected with the first end of the second program-controlled switch.
Further, the resistance values of the first voltage-dividing resistor and the second voltage-dividing resistor are 0.5 Ω.
Further, the filter circuit comprises a first inductor, a second inductor and a capacitor; the first end of the first inductor is electrically connected with the second end of the first program-controlled switch, and the second end of the first inductor is electrically connected with the first end of the capacitor; and the first end of the second inductor is electrically connected with the second end of the second program-controlled switch, and the second end of the second inductor is electrically connected with the second end of the capacitor.
Further, the inductance values of the first inductor and the second inductor are 1 muH, and the capacitance value of the capacitor is 2 nF.
Furthermore, the current limiting circuit comprises a current limiting resistor, and a first end of the current limiting resistor is electrically connected with a first node formed by a second end of the first inductor and a first end of the capacitor; and the second end of the current-limiting resistor is electrically connected with a second node formed by the second end of the second inductor and the second end of the capacitor.
Further, the resistance value of the current limiting resistor is 10 Ω.
Further, the system also comprises a signal generator, wherein a first end of the signal generator is electrically connected with a first end of the power amplifier, and a second end of the signal generator is electrically connected with a second end of the power amplifier.
Furthermore, a secondary circuit of the coupling transformer is electrically connected with the tested device through a decoupling network, and an oscilloscope is further arranged between the secondary circuit of the coupling transformer and the decoupling network.
According to the utility model provides a CS101 test system suitable for GJB151 standard, including power amplifier, power amplifier protection device and coupling transformer; the power amplifier protection device comprises a program control switch group electrically connected with the controller and a filter circuit connected with a second end of the program control switch group, wherein a second end of the filter circuit is electrically connected with a primary circuit of the coupling transformer through a current limiting circuit, and a first end of the program control switch group is electrically connected with an output end of the power amplifier through a voltage dividing circuit. The utility model provides a current test system bear power frequency interference, stress such as transient shock that EUT power supply system introduced at the in-process of test, very easily lead to test system trouble, especially the problem of active power amplifier trouble.
Drawings
FIG. 1 is a schematic structural view of a detection device in an embodiment of the present invention;
FIG. 2 is a front cross-sectional view of FIG. 1;
fig. 3 is a schematic structural diagram of the cooling pipeline in fig. 2.
Description of the main element symbols:
| |
10 | Power |
20 |
| |
21 | Program-controlled |
22 |
| |
23 | Current limiting |
24 |
| |
25 | |
30 |
The following detailed description of the invention will be further described in conjunction with the above-identified drawings.
Detailed Description
In order to make the objects, features and advantages of the present invention more comprehensible, embodiments of the present invention are described in detail below with reference to the accompanying drawings. Several embodiments of the invention are given in the accompanying drawings. The invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. As used herein, the terms "vertical," "horizontal," "left," "right," "up," "down," and the like are for illustrative purposes only and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention.
In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
As shown in fig. 1 to fig. 3, a CS101 test system suitable for the GJB151 standard includes a power amplifier 10, a power amplifier protection device 20, and a coupling transformer 30. The power amplifier 10 is electrically connected to the coupling transformer 30 through a power amplifier protection device 20.
Further, the power amplifier protection device 20 includes a program controlled switch group 22 electrically connected to the controller 21 and a filter circuit 23 connected to a second end of the program controlled switch group 22, a second end of the filter circuit 23 is electrically connected to the primary circuit of the coupling transformer 30 through a current limiting circuit 24, and a first end of the program controlled switch group 22 is electrically connected to the output end of the power amplifier through a voltage dividing circuit 25. The control signal generated by the controller is a high-low level, and if the high-level input switch is connected with the 1 end, the low-level input switch is connected with the 2 end.
The programmable switch group 22 includes a first programmable switch K1 and a second programmable switch K2.
Specifically, the voltage divider circuit 25 includes a first voltage divider resistor R1 and a second voltage divider resistor R2. A first terminal of the first voltage-dividing resistor R1 is electrically connected to the third terminal of the power amplifier 10, and a second terminal of the first voltage-dividing resistor R1 is electrically connected to the first terminal of the first programmable switch K1; a first terminal of the second voltage-dividing resistor R2 is electrically connected to the fourth terminal of the power amplifier 10, and a second terminal of the second voltage-dividing resistor R2 is electrically connected to the first terminal of the second program-controlled switch K2. The resistance values of the first voltage-dividing resistor R1 and the second voltage-dividing resistor R2 are 0.5 omega. It is understood that the first voltage dividing resistor R1 is connected in series with the second voltage dividing resistor R2 to divide the ac voltage passing through the power amplifier 10.
Specifically, the filter circuit 23 includes a first inductor L1, a second inductor L2, and a capacitor C. A first end of the first inductor L1 is electrically connected to a second end of the first program-controlled switch K1, and a second end of the first inductor L1 is electrically connected to a first end of the capacitor C; a first terminal of the second inductor L2 is electrically connected to the second terminal of the second programmable switch K2, and a second terminal of the second inductor L2 is electrically connected to the second terminal of the capacitor C. The inductance values of the first inductor L1 and the second inductor L2 are 1 μ H, and the capacitance value of the capacitor C is 2 nF.
It can be understood that the transient spike interference frequency spectrum generated by the EUT end of the device under test is above 10MHz, and some of the transient spike interference frequency spectrum reaches hundreds MHz even GHz frequency, and the LC filter circuit formed by the inductor capacitor in the present scheme makes the transient energy unable to reach the power amplifier end, and the LC low pass filter in the present scheme has a relatively large suppression performance above 1MHz (see fig. 3, the insertion loss performance (0.006dB) is kept extremely low below 150kHz, the transient stress can be suppressed, and meanwhile, there is no influence on the useful signal output by the power amplifier 10.
Specifically, the current limiting circuit 24 includes a current limiting resistor R3, and a first end of the current limiting resistor R3 is electrically connected to a first node formed by the second end of the first inductor L1 and the first end of the capacitor C; a second terminal of the current limiting resistor R3 is electrically connected to a second node formed by a second terminal of the second inductor L2 and a second terminal of the capacitor C. The resistance value of the current limiting resistor R3 is 10 omega. It will be appreciated that the primary circuit of coupling transformer 30 is looped and current limited by a 10 Ω current limiting resistor, allowing the energy coupled in the secondary to dissipate as quickly as possible.
Further, the system further includes a signal generator SG, a first end of the signal generator SG is electrically connected to the first end of the power amplifier 10, and a second end of the signal generator SG is electrically connected to the second end of the power amplifier 10. The power amplifier 10 is used for amplifying the power of the alternating current signal generated by the signal generator.
Further, the secondary circuit of the coupling transformer 30 is electrically connected to the EUT terminal of the device under test through a decoupling network LISN, and an oscilloscope XSC1 is further disposed between the secondary circuit of the coupling transformer 30 and the decoupling network LISN, and is used for detecting an injection interference level.
The present case can avoid the transient state that equipment under test EUT end break-make electricity, state switch produced to strike and reach the power amplifier through programme-controlled switch group, just programme-controlled switch group passes through GPIB control, can integrate in CS101 test system, and its protection principle is as follows:
1) before testing, the program control switch group is in an 'off' state by default;
2) the lap joint test circuit is used for configuring the EUT working state to ensure that the EUT is in a stable working state; because the EUT is electrified and the state is configured in the process, a transient spike is generated, but because the program control switch group is in an off position, the transient energy coupled to the primary stage cannot pass through the program control switch in the program control switch group, so that the power amplifier is protected;
3) performing EUT performance detection before test according to GJB 151;
4) turning on the power amplifier, and setting the programmable switches in the programmable switch group to be in a 'turn-on' position before the output of the signal generator;
5) injecting interference to perform a CS101 test, and monitoring the EUT performance;
6) after the interference injection is finished, after the output of the signal generator is closed, setting the program control switch in the program control switch group to be in an off position;
7) detecting the EUT performance after the test, closing the EUT and ending the test; because the EUT is powered off in the process, transient spikes are generated, but because the programmable switches in the programmable switch group are in the 'off' position, the transient energy coupled to the primary stage cannot pass through the programmable switches, so that the power amplifier is protected.
According to the scheme, two 0.5-ohm series resistors are used for dividing the alternating voltage coupled by the coupling transformer, the steady-state alternating current stress of the EUT is coupled in the voltage dividing test process, the capability of the output end of the power amplifier for resisting the steady-state power frequency alternating current stress is improved, and the utilization rate of the output power of the power amplifier is not reduced too much.
The utility model provides a CS101 test system suitable for GJB151 standard, including power amplifier, power amplifier protection device and coupling transformer; the power amplifier protection device comprises a program control switch group electrically connected with the controller and a filter circuit connected with a second end of the program control switch group, wherein a second end of the filter circuit is electrically connected with a primary circuit of the coupling transformer through a current limiting circuit, and a first end of the program control switch group is electrically connected with an output end of the power amplifier through a voltage dividing circuit. The utility model discloses can protect power amplifier output to avoid transient state interference stress, reduce the power amplifier fault rate, guarantee test system's reliability, promote the utilization ratio of power amplifier output power; the problem that the existing test system bears power frequency interference, transient impact and other stresses introduced by an EUT power supply system in the test process, so that the test system is prone to faults, especially active power amplifier faults, is solved.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (10)
1. A CS101 test system suitable for GJB151 standard is characterized by comprising a power amplifier, a power amplifier protection device and a coupling transformer; the power amplifier protection device comprises a program control switch group electrically connected with the controller and a filter circuit connected with a second end of the program control switch group, wherein a second end of the filter circuit is electrically connected with a primary circuit of the coupling transformer through a current limiting circuit, and a first end of the program control switch group is electrically connected with an output end of the power amplifier through a voltage dividing circuit.
2. The CS101 test system of claim 1, wherein the set of programmable switches comprises a first programmable switch and a second programmable switch.
3. The CS101 test system of claim 2, wherein the voltage divider circuit comprises a first voltage divider resistor and a second voltage divider resistor; a first end of the first divider resistor is electrically connected with a third end of the power amplifier, and a second end of the first divider resistor is electrically connected with a first end of the first program-controlled switch; and the first end of the second voltage-dividing resistor is electrically connected with the fourth end of the power amplifier, and the second end of the second voltage-dividing resistor is electrically connected with the first end of the second program-controlled switch.
4. The CS101 test system of claim 3, wherein the first voltage-dividing resistor and the second voltage-dividing resistor have a resistance of 0.5 Ω.
5. The CS101 test system of claim 2, wherein the filter circuit comprises a first inductor, a second inductor, and a capacitor; the first end of the first inductor is electrically connected with the second end of the first program-controlled switch, and the second end of the first inductor is electrically connected with the first end of the capacitor; and the first end of the second inductor is electrically connected with the second end of the second program-controlled switch, and the second end of the second inductor is electrically connected with the second end of the capacitor.
6. The CS101 test system of claim 5, wherein the inductance of the first inductor and the second inductor is 1 μ H, and the capacitance of the capacitor is 2 nF.
7. The CS101 test system of claim 6, wherein the current limiting circuit comprises a current limiting resistor, a first end of the current limiting resistor being electrically connected to a first node formed by the second end of the first inductor and the first end of the capacitor; and the second end of the current-limiting resistor is electrically connected with a second node formed by the second end of the second inductor and the second end of the capacitor.
8. The CS101 test system of claim 7, wherein the current limiting resistor has a resistance of 10 Ω.
9. The CS101 test system of claim 1, wherein the system further comprises a signal generator, a first terminal of the signal generator is electrically connected to the first terminal of the power amplifier, and a second terminal of the signal generator is electrically connected to the second terminal of the power amplifier.
10. The CS101 test system according to claim 1, wherein the secondary circuit of the coupling transformer is electrically connected to the device under test via a decoupling network, and an oscilloscope is further disposed between the secondary circuit of the coupling transformer and the decoupling network.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023016770.5U CN214150903U (en) | 2020-12-15 | 2020-12-15 | CS101 test system suitable for GJB151 standard |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023016770.5U CN214150903U (en) | 2020-12-15 | 2020-12-15 | CS101 test system suitable for GJB151 standard |
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| Publication Number | Publication Date |
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| CN214150903U true CN214150903U (en) | 2021-09-07 |
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| CN202023016770.5U Active CN214150903U (en) | 2020-12-15 | 2020-12-15 | CS101 test system suitable for GJB151 standard |
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