CN210775821U - Signal generator for verifying automotive electronics electromagnetic compatibility test site - Google Patents
Signal generator for verifying automotive electronics electromagnetic compatibility test site Download PDFInfo
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- CN210775821U CN210775821U CN201921403955.6U CN201921403955U CN210775821U CN 210775821 U CN210775821 U CN 210775821U CN 201921403955 U CN201921403955 U CN 201921403955U CN 210775821 U CN210775821 U CN 210775821U
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Abstract
A signal generator for automobile electronic electromagnetic compatibility test site verification is composed of a battery, a filter, a first capacitor, a resistor, an antenna and a crystal oscillator, wherein the filter is composed of a second capacitor, a third capacitor, a fourth capacitor and a magnetic ring, the battery is connected with a pin 4 of the crystal oscillator through the filter, a pin 3 of the crystal oscillator is connected with the antenna, the resistor is connected in series with a circuit between the crystal oscillator and the antenna, one end of the first capacitor is connected with the antenna, the other end of the first capacitor is grounded, and a pin 2 of the crystal oscillator is grounded. The utility model discloses signal stability, low power dissipation, with low costs, the utility model discloses the signal amplitude of transmission changes linearly along with supply voltage's change, and through the length of adjustment antenna, can guarantee the signal of radiation with the amplitude of tuning frequency point and verify test system's saturation characteristic by enough strength in addition.
Description
Technical Field
The utility model relates to an electromagnetic compatibility field verification signal generator, the compliance is verified to the place system before specially adapted electromagnetic compatibility radiation harassment is experimental, guarantees the uniformity around the test place system.
Background
The radiation disturbance test of the automobile electronic electromagnetic compatibility relates to the characteristics and the connection matching performance of each test component of a system, a receiver, a cable, a signal amplifier, a cable end interface joint, an attenuator and a test antenna (particularly an active antenna), in particular to a near field test based on a 1 m method in the automobile electronic electromagnetic compatibility standard. Different factors may have different effects on the test results. There is an impedance matching problem between the antenna and the cable, the output impedance of the antenna is 50ohm, and due to the characteristics of the antenna, the 50ohm output impedance characteristics of the antenna and the impedance characteristics of the cable are not well matched, so that the non-correlation is easily generated. The receiver, the signal amplifier and the active antenna are sensitive to signals, particularly large signals are easy to overload, the original characteristics of a test part are easy to damage, and the inaccuracy of a test result is caused. In order to ensure the accuracy and consistency of test results, a stable signal generator is required to be adopted before each test to verify the consistency of an electromagnetic compatibility radiation disturbance test field. The signal generators available at present have their own disadvantages, in addition to being very costly:
1) when the signal generator works, because a wide electromagnetic wave band needs to be continuously radiated, the battery power of the signal generator is very easy to consume, and after the battery power is reduced, signals transmitted by the portable signal generator are not changed linearly, so that the accuracy of the signals is very difficult to ensure in a tested signal result.
2) With a desktop signal generator, the signal is stable but is very inconvenient to arrange in the field.
Disclosure of Invention
In order to solve the actual problem that present signal generator exists, the utility model provides a signal generator that stable, low power dissipation, with low costs automotive electronics electromagnetic compatibility test site of signal are verified. The utility model discloses the signal amplitude of transmission is linear along with supply voltage's change and changes, and through the length of adjustment antenna, can guarantee the enough strong saturation characteristic of verifying test system of signal of radiation with the amplitude of tuning frequency point in addition.
The utility model discloses a by battery, wave filter, first electric capacity, resistance, antenna and crystal oscillator constitute, the wave filter comprises second electric capacity, third electric capacity, fourth electric capacity and magnetic ring, the battery passes through the wave filter to be connected with crystal oscillator's power end VCC, crystal oscillator's output OUT and antenna connection, the resistance is established ties on the circuit between crystal oscillator and antenna, first electric capacity one end and antenna connection, the other end ground connection of first electric capacity, crystal oscillator's earthing terminal GND ground connection.
The model of the crystal oscillator is SG-210 SCBA.
The battery is a loose 18650 battery.
The crystal oscillator is a temperature control type crystal oscillator.
The antenna adopts a coaxial cable.
The resistance value of the resistor is 10 omega; the capacitance of the first capacitor is 10 pF; the capacitance of the second capacitor is 0.01 muF; the capacitance of the third capacitor is 0.1 muF; the capacitance of the fourth capacitor is 4.7 muF.
The utility model discloses a working process:
the working current of the utility model is 2.84mA, the large-capacity loose 18650 battery is adopted for power supply to stabilize the normal work of the signal generator for a long time, and the noise wave brought by other direct current power supplies is reduced; and a filter consisting of the second capacitor, the third capacitor, the fourth capacitor and the magnetic ring plays a role in filtering, so that the purity and stability of the power supply are ensured. The resistance adopts a 10 omega resistance to ensure the impedance matching of the antenna, reduces the reflected wave of the antenna and improves the transmitting efficiency, and the first capacitor plays a role in smoothing the output waveform and is beneficial to the stable output of the waveform. The crystal oscillator adopts a temperature control type crystal oscillator, and the temperature control type crystal oscillator has the maximum characteristic of small temperature deviation and is very stable. The antenna is made of a coaxial cable material, and the length of the antenna is processed according to the amplitude of actually required frequency. By adjusting the length of the antenna, the amplitude of the tuning frequency point can be ensured to ensure that the radiated signal is strong enough to verify the saturation characteristic of the test system.
The utility model discloses it is right through adopting the 1 meter method of telescopic aerial in the CISPR25 standard the utility model discloses test verification. The utility model discloses an when antenna length is 5cm, test data is as shown in figure 2, and when voltage signal generator's supply voltage 4VDC, the field intensity of telescopic antenna test is 84v/m, and along with the reduction of voltage the intensity of test field intensity is linear reduction basically, when reducing voltage to 2.8VDC, the field intensity of test is 72.3 v/m. Through the test of the data, the linearity of the power supply voltage and the test field intensity is very good, and the consistency of the field can be evaluated very stably.
The utility model has the advantages that:
the utility model discloses signal stability, low power dissipation, with low costs, the utility model discloses the signal amplitude of transmission changes linearly along with supply voltage's change, and through the length of adjustment antenna, can guarantee the signal of radiation with the amplitude of tuning frequency point and verify test system's saturation characteristic by enough strength in addition.
Drawings
Fig. 1 is a circuit diagram of the present invention.
Fig. 2 is a relationship diagram of the power supply voltage and the test field intensity of the present invention.
Detailed Description
Please refer to fig. 1, the present invention comprises a battery 1, a filter 2, a first capacitor C1, a resistor R1, an antenna 3 and a crystal oscillator 4, wherein the filter 2 comprises a second capacitor C2, a third capacitor C3, a fourth capacitor C4 and a magnetic ring FB-1, the battery 1 is connected to a power terminal VCC of the crystal oscillator 4 through the filter 2, an output terminal OUT of the crystal oscillator 4 is connected to the antenna 3, the resistor R1 is connected in series to a circuit between the crystal oscillator 4 and the antenna 3, one end of the first capacitor C1 is connected to the antenna 3, the other end of the first capacitor C1 is grounded, and a ground terminal GND of the crystal oscillator 4 is grounded.
The model of the crystal oscillator 4 is SG-210 SCBA.
The battery 1 is a loose 18650 battery.
The crystal oscillator 4 is a temperature control type crystal oscillator.
The antenna 3 adopts a coaxial cable.
The resistance value of the resistor R1 is 10 omega; the capacitance of the first capacitor C1 is 10 pF; the capacitance of the second capacitor C2 is 0.01 μ F; the capacitance of the third capacitor C3 is 0.1 muF; the capacitance of the fourth capacitor C4 is 4.7 muf.
The utility model discloses a working process:
as shown in fig. 1, the working current of the utility model is 2.84mA, the large-capacity loose 18650 battery is adopted for power supply to stabilize the normal operation of the signal generator for a long time, and the noise caused by other direct current power supplies is reduced; and a filter consisting of the second capacitor C2, the third capacitor C3, the fourth capacitor C4 and the magnetic ring FB-1 plays a filtering role, so that the purity and stability of the power supply are ensured. The resistor R1 adopts a 10 omega resistor to ensure the impedance matching of the antenna 3, reduce the reflected wave of the antenna 3 and improve the transmitting efficiency, and the first capacitor C1 plays a role in smoothing the output waveform and is beneficial to the stable output of the waveform. The crystal oscillator 4 is a temperature-controlled crystal oscillator, which has the greatest characteristic of small temperature deviation and is very stable. The antenna 3 is made of a coaxial cable material, and the length of the antenna is processed according to the amplitude of actually required frequency. By adjusting the length of the antenna, the amplitude of the tuning frequency point can be ensured to ensure that the radiated signal is strong enough to verify the saturation characteristic of the test system.
The utility model discloses it is right through adopting the 1 meter method of telescopic aerial in the CISPR25 standard the utility model discloses test verification. The utility model discloses a 3 length of antenna are when 5cm, and the test data is as shown in figure 2, and when voltage signal generator's supply voltage 4VDC, the field intensity of telescopic antenna test is 84v/m, and along with the intensity of the reduction test field intensity of voltage is linear reduction basically, when reducing voltage to 2.8VDC, the field intensity of test is 72.3 v/m. Through the test of the data, the linearity of the power supply voltage and the test field intensity is very good, and the consistency of the field can be evaluated very stably.
Claims (3)
1. The utility model provides a signal generator that automotive electronics electromagnetic compatibility test site was verified which characterized in that: the circuit is composed of a battery (1), a filter (2), a first capacitor (C1), a resistor (R1), an antenna (3) and a crystal oscillator (4), wherein the filter (2) is composed of a second capacitor (C2), a third capacitor (C3), a fourth capacitor (C4) and a magnetic ring (FB-1), the battery (1) is connected with a power supply end VCC of the crystal oscillator (4) through the filter (2), an output end OUT of the crystal oscillator (4) is connected with the antenna (3), the resistor (R1) is connected in series with a circuit between the crystal oscillator (4) and the antenna (3), one end of the first capacitor (C1) is connected with the antenna (3), the other end of the first capacitor (C1) is grounded, and the ground end GND of the crystal oscillator (4) is grounded.
2. The signal generator for automotive electronics-electromagnetic compatibility test site verification of claim 1, wherein: the model of the crystal oscillator (4) is SG-210 SCBA; the battery (1) is a loose 18650 battery; the crystal oscillator (4) is a temperature control type crystal oscillator; the antenna (3) adopts a coaxial cable.
3. The signal generator for automotive electronics-electromagnetic compatibility test site verification of claim 1, wherein: the resistance value of the resistor (R1) is 10 omega; the capacitance of the first capacitor (C1) is 10 pF; the capacitance of the second capacitor (C2) is 0.01 mu F; the capacitance of the third capacitor (C3) is 0.1 muF; the capacitance of the fourth capacitor (C4) is 4.7 muF.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921403955.6U CN210775821U (en) | 2019-08-27 | 2019-08-27 | Signal generator for verifying automotive electronics electromagnetic compatibility test site |
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| CN201921403955.6U CN210775821U (en) | 2019-08-27 | 2019-08-27 | Signal generator for verifying automotive electronics electromagnetic compatibility test site |
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| CN210775821U true CN210775821U (en) | 2020-06-16 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111913070A (en) * | 2020-08-11 | 2020-11-10 | 一汽奔腾轿车有限公司 | Method for evaluating electromagnetic compatibility of whole electric vehicle |
| CN113092902A (en) * | 2021-03-29 | 2021-07-09 | 一汽奔腾轿车有限公司 | Automobile wireless charging electromagnetic compatibility test system and control method thereof |
| CN113295939A (en) * | 2021-03-29 | 2021-08-24 | 一汽奔腾轿车有限公司 | Vacuum pump electromagnetic compatibility test system and control method thereof |
-
2019
- 2019-08-27 CN CN201921403955.6U patent/CN210775821U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111913070A (en) * | 2020-08-11 | 2020-11-10 | 一汽奔腾轿车有限公司 | Method for evaluating electromagnetic compatibility of whole electric vehicle |
| CN111913070B (en) * | 2020-08-11 | 2022-07-22 | 一汽奔腾轿车有限公司 | Method for evaluating electromagnetic compatibility of whole electric vehicle |
| CN113092902A (en) * | 2021-03-29 | 2021-07-09 | 一汽奔腾轿车有限公司 | Automobile wireless charging electromagnetic compatibility test system and control method thereof |
| CN113295939A (en) * | 2021-03-29 | 2021-08-24 | 一汽奔腾轿车有限公司 | Vacuum pump electromagnetic compatibility test system and control method thereof |
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