JPS6211808B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pseudo-noise generator, and more particularly to a device that applies damped oscillatory wave pseudo-noise to a power supply current supplied to a load.

In order to evaluate the power supply noise characteristics of electronic equipment, pseudo noise is injected into the power supply line and supplied together with the power supply. The equipment used for this purpose consists of a power supply line, a signal generation circuit, and a circuit that injects the signal into the power supply line, but conventional equipment of this type has the disadvantage that pseudo-noise changes depending on the load. . In addition, when trying to generate pseudo noise without changing it due to load, it is common to use transformer coupling, but in the case of injecting high energy noise, the shape of the transformer becomes large, which is not economical.

The object of the invention is to provide a device which eliminates the above-mentioned drawbacks.

The present invention provides a device for supplying pseudo noise on a power supply current supplied to a load, which includes a power supply line supplying power to the load, a first inductance connected in series to the power supply line, and a first inductance connected in parallel. a signal injection circuit consisting of a first capacitor and a first switch connected in parallel to the first inductance; a DC power supply and a signal injection circuit connected in series between the two poles of the DC power supply through a resistor; a second inductance, a second capacitor, and a second switch connected between one end of the series circuit of the second inductance and the second capacitor and one end of the first inductance; The damped vibration generator is configured by connecting the other end of the series circuit of the second inductance and the second capacitor to the other end of the first inductance, and when the first switch is turned off and the second This device supplies pseudo noise on the power supply current, characterized in that by turning on the switch, a damped oscillation wave is applied to the load through the power supply line.

In addition, when the load power source is AC, the above first
Instead of the inductance, a circuit consisting of an inductance and a capacitor that resonates in series with the power frequency can be used.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to embodiments and drawings.

FIG. 1 is a circuit diagram showing an embodiment of the present invention, in which a capacitor C _{1 and an inductance L 1 are inserted and connected in series to power lines l 1} and l ₂ that supply power from a power source 1 to a load 2, and a capacitor C ₁ and an inductance L ₁ are connected in series. A signal injection circuit is constructed by connecting C ₂ in parallel and connecting switch SW ₁ across the series circuit of capacitor C ₁ and inductance L ₁ . Capacitor C ₁ and inductance
L ₁ is chosen to be series resonant at the frequency of power supply 1 . Capacitor C ₂ passes the injected signal and short-circuits the power supply 1.

The negative pole of the DC power supply 3 is directly connected to one end of the series circuit of the inductance L ₁ and the capacitor C ₁ ,
A positive electrode is connected to the other end via a resistor R and a switch _SW2 . A capacitor C ₃ is connected between the common connection point of the resistor R and switch SW ₂ and the negative electrode of the DC power supply 3.
and inductance _L2 are connected in series.

Note that the switches SW ₁ and SW ₂ may both be contact switches or electronic switches.

When no signal is injected, switch SW ₁ is turned on and switch SW ₂ is turned off. In this state, the inductance _L1 and the capacitor _C1 are short-circuited by the switch _SW1 , so that the power source 1 is supplied to the load 2 without voltage drop. Meanwhile during this time capacitor C ₃
is charged by the DC power supply 3. Thereafter, by turning off the switch _SW1 and turning on the switch _SW2 , the charge in the capacitor _C3 is discharged to the load via the power lines _l1 and _l2 . At this time, the discharge current becomes a damped oscillatory wave signal having a frequency determined by the capacitor C ₃ , the inductance L ₂ , and the load 2 and a damping rate determined by the load 11 .

Here, L ₁ , C ₁ , and C ₂ should be selected so that this damped oscillation wave is transmitted reliably, so the frequency of the damped oscillation wave is set to ₀ , and the impedance of load 2 is set to 0.
When Zl and the frequency of power supply 1 are _s , L ₁ and C ₁ are _s
= 1/2π√ _{1 1} and should satisfy Zl≪2π ₀ L ₁ . Further, C ₂ may be selected so as to satisfy Zl≫1/2π ₀ C ₂ . The reason for this will be explained below. If _s = 1/2π√ _{1 1} is satisfied, the source power can be reduced to load 2 without loss even by inserting L ₁ and C ₁ .
supplied to Furthermore, when Zl≪2π ₀ L ₁ is satisfied, the reactance of L ₁ and C ₁ to the damped oscillation wave becomes sufficiently higher than the load impedance Zl, so the damped oscillation wave flows into the circuit of L ₁ and C ₁ . Therefore, the signal is reliably transmitted to the load 2. Further, if Zl≫1/2π ₀ C ₂ , the damped vibration wave is transmitted to the load 2 without being attenuated by C ₂ .

The damped vibration wave naturally disappears due to the load 2. Then turn on switch SW ₁ and turn off switch SW ₂ . By repeating such an operation, damped vibration waves can be repeatedly applied to both ends of the load 2. FIG. 2 shows another embodiment of the invention. In the embodiment of FIG. 1, when various loads are used, the attenuation rate varies depending on the load that determines the ringing attenuation rate. Therefore, in this example,
In order to provide a stable attenuation rate, a variable resistor VR is placed in parallel with switch SW ₁ , so that the attenuation rate can be adjusted. 3 and 4 show other embodiments of the present invention. In Figures 1 and 2, if you want to use a DC power supply as power supply 1,
When SW ₁ is turned off, DC power is transferred to the capacitor.
It is blocked by C ₁ . Therefore, the embodiments of FIGS. 3 and 4 are obtained by removing capacitor C ₁ from the embodiments of FIGS. 1 and 2, respectively.

Of course, as shown in FIGS. 3 and 4, it is also possible to use the AC power supply 1, but in that case, a voltage will be generated across the inductance _L1 , and the signal generation section will be affected by the AC voltage disturbance. receive. Additionally, the voltage developed across this inductance may prevent the source power from being effectively transferred to the load.

This tendency becomes more noticeable as the power consumption of the load increases, so it is not practical for such loads. However, if the load is light, there will be no problem.

As described above, according to the present invention, it has become possible to apply stable pseudo noise to the load without causing any power loss to the load.

[Brief explanation of the drawing]

Figure 1 is a circuit diagram showing one embodiment of the present invention, Figure 2 is a circuit diagram showing an embodiment of the present invention.
3, and 4 are circuit diagrams showing other embodiments of the present invention. 1 is the power supply, 2 is the load, 3 is the DC power supply, L ₁ , L ₂
is the inductance, SW ₁ and SW ₂ are the switches, C ₁ ,
C ₂ and C ₃ are capacitors, R is a resistor, and VR is a variable resistor.

Claims (1)

[Scope of Claims] 1. In a device that supplies pseudo noise on a power supply current supplied to a load, a power supply line supplying power to the load, a first inductance connected in series to the power supply line, and a parallel the first connected to
a signal injection circuit consisting of a capacitor and a first switch connected in parallel to the first inductance, a DC power supply, and a second signal injection circuit connected in series between the two poles of the DC power supply through a resistor. an inductance, a second capacitor, and a second switch connected between one end of the series circuit of the second inductance and the second capacitor and one end of the first inductance; The damped oscillation generator is constructed by connecting the other end of a series circuit of a second inductance and a second capacitor to the other end of the first inductance, and the first switch is turned off and the second switch is turned off. A device for supplying pseudo noise on a power supply current, characterized in that by turning on a damped oscillatory wave is applied to a load through a power supply line. 2. A device that supplies pseudo noise on top of the power supply current supplied to a load, comprising a power supply line supplying AC power to the load, a first inductance and a first capacitor inserted and connected in series to the power supply line. a series resonant circuit that resonates at the AC power frequency, a second capacitor connected in parallel to the power supply line, and a first inductance and a first capacitor connected in parallel to the series resonant circuit of the first capacitor. A signal injection circuit consisting of a switch,
and a DC power supply, a second inductance and a third capacitor connected in series via a resistor between both poles of the DC power supply, and one end of the series circuit of the second inductance and the third capacitor and the above. 1st
and a second switch connected between one end of the series resonant circuit made up of an inductance and a first capacitor, and the other end of the series resonant circuit made of the second inductance and a third capacitor connected to the first end. The first switch is turned off and the second switch is turned on to generate a damped vibration wave. A device for supplying pseudo noise on a power supply current, characterized in that the noise is applied to a load through a power supply line. 3. A pseudo noise supply device according to claim 1 or 2, in which a variable resistor is connected in parallel with the first switch to control the attenuation rate of the damped vibration wave.