JPH06216647A - Radiation noise generating method and radiation noise generator - Google Patents

Abstract

PURPOSE:To make it possible to generate radiation noise which is equivalent to radiation noise generating from current flowing in lead wires located at various locations by selectively flowing current generating radiation noise in plural lead wires. CONSTITUTION:A program power source 1 is connected with a low frequency oscillator 2, the output is superposed on power supply voltage, a simulation signal generating simulation noise is generated and it is supplied to a radiation noise generator 3. The generator 3 is composed of lead wires L1 to L9 and switches SW1 to SW9 provided on each lead wire, a simulation signal flows in the lead wire corresponding to the switch which is turned on and simulation noise is radiated from the wire. A load resistance 4 is connected with the radiation noise generator 3 and simulation noise generates in the same way as an actual electrical equipment. Therefore, by the states of the switches SW1 to SW9, the simulation signals flowing in the lead wires L1 to L9 can be controlled and simulation noise in various conditions can be generated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radiation noise resistance measuring device for measuring resistance of a product to radiation noise generated from a power supply line or the like, and particularly to radiation noise for imitating radiation noise. The present invention relates to a generation method and a radiation noise generation device.

[0002]

2. Description of the Related Art In recent automobiles, various controls have been computerized, and many electric components such as audio devices are mounted. Therefore, many conductors such as power supply lines and signal lines are laid inside the automobile. For this reason, the inside of the vehicle is filled with radiation noise radiated from these lines, and various electric components are taken measures to prevent malfunctions and the like due to these radiation noise. Particularly, in a device having a magnetic head such as a tape player or a device having a high impedance input, the influence of these radiation noises is great, and the radiation noise resistance characteristic is important.

For this reason, the manufacturers of these devices are conducting research and development and design for improving the radiation noise resistance. It is necessary to mount the device to be measured, but in that case mounting of the device is troublesome, and there is a problem in that the arrangement of the measuring device and the like is difficult. In addition, there is a problem that it is very difficult to measure radiation noise of various patterns because it requires a troublesome work such as returning the mounting position of the object to be measured.

For this reason, there has been considered a method of simulating radiation noise in a laboratory or the like and measuring the radiation noise resistance. FIG. 5 is a diagram showing a conventional radiation noise generator. Reference numeral 31 denotes an object to be measured for radiation noise resistance, the output of which is connected to a measuring device such as an FFT (Fast Fourier Transform) analyzer (not shown). 32 is a program power supply, according to a preset order and time,
It is a power supply that switches the power supply voltage, turns on and off, and so on. A low-frequency oscillator 33 is connected to the program power supply 32, and a low-frequency signal generated by the low-frequency oscillator 33 is superimposed on the power supply voltage generated by the program power supply 32 and applied to the conductor L30, and the conductor L30 is connected to the conductor L30. A current I30 flows. A load R30 corresponding to the load of the actual electrical component is connected to the conductor L30, and is in the same state as the actual electrical component. Therefore, the current I30 is supplied from the conductor L30.
According to the above, the radiated noise is radiated, and the output signal of the DUT 31 includes the signal affected by the radiated noise, and the state is measured by a measuring device (not shown).

[0005]

However, according to the conventional method shown in FIG. 5, only the effect of radiation noise corresponding to the initially set position of the conductor L30 can be measured, and the conductor L30 is not measured.
When measuring the influence of the object to be measured 31 depending on the position, it is necessary to move the conducting wire L30 as shown by an arrow A or measure, or move the object to be measured 31 as an arrow B to measure. However, it was very troublesome due to the need for alignment.

[0006]

The present invention has been made in view of the above problems, and is a method characterized in that a current for generating radiation noise is selectively passed through a plurality of conducting wires. . Further, it is characterized by comprising a power source for generating a current for generating radiation noise, a plurality of conducting wires, and a switch means for selectively supplying the plurality of conducting wires with the current from the power source.

[0007]

According to the radiation noise generating method of the present invention, it is possible to generate the radiation noise equivalent to the radiation noise generated from the current flowing through the conductors at various positions only by selectively passing the current through the plurality of conductors. You can Further, according to the radiation noise generator of the present invention, it is possible to selectively flow a current through a plurality of conducting wires by switching a switch, and radiation equivalent to radiation noise generated from the current flowing through the conducting wires at various positions. Can generate noise.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of the present invention. 1
Is a program power supply that switches the power supply voltage, turns on and off according to a preset order and time. A low-frequency oscillator 2 is connected to the program power supply 1, and a low-frequency signal output from the low-frequency oscillator 2 is superimposed on the power supply voltage of the program power supply 1 to generate simulated noise for simulating radiation noise. Is generated and supplied to the radiation noise generator 3. The radiation noise generator 3 is composed of conductors L1 to L9 and switches SW1 to SW9 provided on the conductors,
A simulated signal flows through the conductor corresponding to the switch that is turned on, and simulated noise is radiated from the conductor. The load resistor 4 corresponding to the actual electrical component is connected to the radiation noise generator 3 so that the simulated noise is generated in the same manner as in the case of the actual electrical component.

Therefore, in this embodiment, the switch S
Depending on the states of W1 to SW9, it is possible to control the simulated signal flowing through the conductors L1 to L9 and generate simulated noise in various states. FIG. 2 is a diagram showing an appearance of the radiation noise generator. Reference numeral 10 denotes an upper surface side printed circuit board on which 11 conductor patterns L11 are provided. Further, the lower surface side printed circuit board 12 is also provided with eleven conductor patterns L12 similarly to the upper surface side printed circuit board 10. Then, four columns 13, 14 and 15 are fixed by screws between the upper surface side printed circuit board 10 and the lower surface side printed circuit board 12, and a space is provided between the both printed circuit boards 10 and 12 to measure the object to be measured. Can be placed.

The conductor patterns L11 and L13 on both printed circuit boards 11 and 12 are connected by a cord L16, and the conductor patterns L11 correspond to the switch box 1.
It is connected to a program power supply (not shown) via each switch provided in the unit 7. Then, each conductor pattern L12 is guided into the switch box 17 by the cord L18, and is connected to the ground via the load resistance in the switch box 17. The circuit in the switch box 17 is connected by a cord 19 to a program power supply (not shown).

Therefore, the circuit configuration of the radiation noise generator shown in FIG. 2 is equivalent to that shown in FIG. 1, and the code 19, the switch box 17 (switch), and the conductor pattern L1.
1, code L16, conductor pattern L12, code L1
8, the simulated signal flows through the route of the switch box 17 (load) and the cord 19. FIG. 3 is a block diagram showing an example of a printed circuit board which is an example of a radiation noise generator, for example, the upper surface side printed circuit board or the lower surface side printed circuit board shown in FIG. In the embodiment shown in FIG. 2, an example of a conductor pattern extending only in one direction is shown as the printed board, but in the printed board shown in FIG. 3, conductor patterns X1 to X13 extending in the lateral direction are provided on the upper surface of the printed board 20, Further, conductor patterns Y1 to Y13 extending in the vertical direction are provided on the upper surface.
The conductor patterns on the upper side printed circuit board have switches SWX1 to SWX13 and switches SWY1 to SWY1.
3 is connected to the program power source, and the other end of each conductor pattern is connected to the load via each conductor pattern of the lower surface side printed circuit board configured similarly to the upper surface as in the configuration of FIG. .

Therefore, in the case of the embodiment shown in FIG. 3, simulated noise can be generated by the horizontal and vertical conductor patterns, and simulated noise can also be generated by a combination of both directions.
The conductor patterns provided on the printed circuit board are not limited to the arrangements shown in FIGS. 2 and 3, and various arrangements can be taken as necessary. FIG. 4 is a configuration diagram showing an outline of the radiation noise resistance measuring apparatus. Reference numeral 31 is a program power supply for switching the power supply voltage, turning on and off, etc. according to a preset order and time. A low-frequency oscillator 32 is connected to the program power supply 31, and the low-frequency signal output from the low-frequency oscillator 32 is superimposed on the power supply voltage of the program power supply 31 to generate simulated noise for simulating radiation noise. Is generated and supplied to the radiation noise generator 33. The radiation noise generator 33 has a structure as shown in FIG.

A stabilizing power supply 35 is connected to the object to be measured 34 such as a tape player, and the power switch is operating in the ON state. A load 36 equivalent to the actual usage state, for example, a load equivalent to the speaker is connected to the DUT 34, and is in the same state as the actual usage state.
Then, the DUT 34 is installed at a predetermined position of the radiation noise generator 33. The output of the DUT 34 is F
Input to FT (Fast Fourier Transform) analyzer 37,
The output signal is measured. Then, the measurement result is recorded by the plotter 38.

The system controller 39 controls the program power supply, the output frequency and level of the low frequency oscillator 32, the switch of the radiation noise generator 33, the FFT analyzer 37, and the plotter according to the stored program. 38 and synchronous control of each device.

[0015]

As described above, according to the radiation noise generating method of the present invention, it is equivalent to the radiation noise generated from the currents flowing through the conductors at various positions only by allowing the currents to selectively flow through the plurality of conductors. Radiation noise can be generated. Further, according to the radiation noise generator of the present invention, it is possible to selectively flow a current through a plurality of conducting wires by a simple operation of switching a switch, and the radiation noise generated from the current flowing through the conducting wires at various positions. Radiation noise equivalent to can be generated.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an embodiment of the present invention.

FIG. 2 is a diagram showing the appearance of a radiation noise generator.

FIG. 3 is a diagram showing a printed circuit board showing an example of a radiation noise generator.

FIG. 4 is a configuration diagram of a radiation noise performance measuring device.

FIG. 5 is a diagram showing a conventional radiation noise generator.

[Explanation of symbols]

 1 Program power supply 2 Low frequency oscillator 3 Radiation noise generator L1 to L9 Conductor SW1 to SW9 switch

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor ▲ Yabu ▼ Taka Takamoto 1-2-2 Goshodori, Hyogo-ku, Kobe, Hyogo Prefecture Fujitsu Ten Limited (72) Inventor Yoshitaka Takamura Hyogo-ku, Kobe, Hyogo Prefecture Goshodori 1-228 Fujitsu Ten Limited

Claims (2)

[Claims] 1. A radiation noise generating method, wherein a current for generating radiation noise is selectively passed through a plurality of conductors. 2. A radiation noise comprising a power supply for generating a current for generating radiation noise, a plurality of conductors, and a switch means for selectively supplying the plurality of conductors with the current from the power supply. Generator.