JPH0332091Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a damped vibration generation circuit for pseudo noise using a thyristor as a source of vibration waves.

[Conventional technology]

The circuit that generates high-amplitude damped oscillatory waves in pseudo-noise generators uses a discharge gap or relay in the oscillatory wave generation section to discharge the energy charged in a capacitor or the like to a load consisting of inductance and resistance. . Conventionally, an example of this kind of generation circuit is as shown in Fig. 3. Energy charged in a capacitor 3 from a high-voltage DC power supply 1 via a resistor 2 operates a relay 11, which closes its contact 12, and is connected to a resistor 5 and an inductance. 4 is discharged into a circuit with a load. At this time, a unique vibration is generated depending on the capacitance value of the capacitor 3 and the value of the inductance 4, and when the relay 11 is operated, an arc discharge occurs at the contact point 12, and a damped vibration is generated as shown in FIG.

[Problem that the invention attempts to solve]

However, if the conventional damped vibration generating means is used continuously, the contact 12 deteriorates, and since the generation is performed by arc discharge, stable discharge cannot be obtained. It has disadvantages such as not being able to obtain the correct waveform as shown in the solid line, correcting the distortion in the waveform as shown in the solid line, the amplitude being unstable, and the vibration being interrupted.

[Means for solving problems]

The present invention eliminates such drawbacks of the conventional method and transfers the electric charge of the capacitor 3 charged from the high voltage DC power supply 1 to the resistor 5.
In a damped vibration generation circuit for pseudo noise that discharges a circuit consisting of an inductance 4 and an inductance 4 as a load, the damped vibration generation circuit is a damped vibration generation circuit formed by connecting a thyristor whose gate is controlled between the capacitor 3 and the load, and is stable. The purpose is to generate vibrations.

[Effect]

When the thyristor is reverse biased from the on state and accumulates until it is cut off, a reverse direction current flows, and an oscillating current flows as a bidirectional switch.

[Embodiment] As shown in FIG. 1, an embodiment of the damped vibration generating circuit of the present invention includes a charging circuit with a capacitor 3 charged from a DC power source 1 through a resistor 2, and an inductance 4.
A one-way thyristor 7 whose gate 8 is controlled by a gate control circuit 6 is connected between the discharge circuit and the discharge circuit having a resistor 5 as a load.

Now, when the capacitor is charged by the DC power supply 1, when a current is passed from the gate control circuit 6 to the gate 8 of the thyristor 7, the thyristor 7 is suddenly turned on and the capacitor 3 becomes a discharge circuit whose load is the resistor 5 and inductance 4. begins to discharge. When the thyristor 7 is on, a current flows from the anode 9 to the cathode 10, and when it is biased in the reverse direction, only a small current flows.Thyristor 7 is reverse biased from the on state, and during the accumulation time until it is cut off, a current flows in the reverse direction to the gate 8. Pass current. Therefore, the on-current starts to oscillate at the period of the resonant frequency F, which is composed of the capacitance C of the capacitor 3 and the inductance value L, and does not occur in the normal usage state of the thyristor 7 after 1/2 F time after the current flows. Backflow begins. However, during the reverse recovery period when the carrier generated by the forward current injected from the gate 8 exists in the thyristor 7, the rectification characteristic is not exhibited, and when the oscillation period is sufficiently small with respect to the reverse recovery time, the thyristor exhibits bidirectional characteristics. The oscillating current flows through the thyristor 7 instead. Therefore, as shown in FIG. 2, the waveform of the vibration wave generated by the discharge phenomenon does not have any droop at its tail, and pseudo noise can be generated using the inexpensive unidirectional thyristor 7.

[Effect of idea]

As described above, according to the present invention, a single unidirectional thyristor 7 is used to provide the performance of a bidirectional switch, without using a mechanical element such as a relay as in the past, and it is stable with high amplitude. A vibration wave generation circuit suitable for a pseudo-noise generator that can generate vibration waves with good vibration and no disturbance is obtained.

[Brief explanation of the drawing]

Fig. 1 is an electrical circuit diagram of an embodiment of the damped vibration generation circuit of the present invention, Fig. 2 is a vibration waveform diagram generated by the circuit of Fig. 1, and Fig. 3 is an example of a conventional damped vibration generation circuit. The electrical circuit diagram, FIG. 4, is a diagram of vibration waveforms generated by the circuit of FIG. 3. Note that 1: DC power supply, 2, 5: resistor, 3: capacitor, 4: inductance, 6: gate control circuit, 7: thyristor, 8: gate.

Claims (1)

[Scope of utility model registration request] In a damped vibration generation circuit that discharges the electric charge of a capacitor 3 charged by a DC power source 1 using a circuit consisting of a resistor 5 and an inductance 4 as a load,
A damped vibration generating circuit comprising a unidirectional thyristor 7 whose gate 8 is controlled is connected between the capacitor 3 and the load.