Oscillators – Solid state active element oscillator – Transistors
Patent
1981-02-27
1982-12-07
Grimm, Siegfried H.
Oscillators
Solid state active element oscillator
Transistors
363 19, H03K 330, H02M 3335, G05F 164
Patent
active
043630057
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE ART
The present invention relates to a voltage stabilizing circuit of a power source for use with discharge type sensor or such.
BACKGROUND OF THE ART
Power sources for sensors such as Geiger counter tube and ultraviolet sensing tube, using discharge tubes as their sensing elements, have commonly used supply voltages slightly lower than respective self-discharge voltages of the discharge tubes.
In general, the power source to be used for a sensor has to supply a stable operating voltage to the sensing circuit to thus keep this functionable at all times during the sensing mode of operation and waiting mode of operation for obtaining a reliable operation. Accordingly, the sensor consumes a certain amount of electric power even in the waiting mode, wherein no sensing mode occurs, to hold ready for the sensing. The sensor of discharge type has a performance characteristic such that it consumes a large amount of electric power in the sensing mode only, stores rapidly electric power for discharge concurrently with the sensing mode in order to provide for the next sensing mode, and consumes an extremely small amount of electric power in the waiting mode. Therefore, the power source to be used for a discharge type sensor is needed to be designed so as to rapidly supply a large amount of electric power only in the time of discharge in the sensing mode and supply no more than such amount of power that is consumed as a loss in the waiting mode i.e., to reduce the power consumption as a whole, with a stable voltage being supplied to the sensor, thereby enabling the sensor to operate effectively and reliably over a long period of time.
DISCLOSURE OF THE INVENTION
The inventors have accomplished the present invention to develop a power source which can effectively meet the requirements necessary for power sources to be used for discharge type sensors.
An object of the present invention is to provide a power source voltage stabilizing circuit wherein a base of an oscillatory transistor of a blocking-oscillatory circuit is connected through a resistor to a drain of a control transistor, a circuit is provided between a primary winding of a transformer of the blocking oscillatory circuit and a gate of the control transistor for applying a voltage at a terminal of the primary winding of the transformer to the gate of the control transistor, the transformer has a secondary winding connectable to a discharge type sensing circuit, and a base current of the oscillatory transistor is controlled with the control transistor to change the period of oscillation of the blocking-oscillatory circuit.
According to the present invention, when a starting switch is closed or the sensing circuit is performing a sensing mode of operation, the control transistor is substantially on, shortening the period of oscillation of the blocking-oscillatory circuit for rapid supply of electric power for discharge. When the sensing circuit is performing a waiting mode of operation, in which no sensing mode occurs, the control transistor remains substantially off, prolonging the period of oscillation of the blocking-oscillatory circuit for reducing the supply of electric power. The present invention is therefore advantageous in that the power consumption can be reduced as a whole and a stable power source voltage can be applied in accordance with performance characteristics of the sensing circuit.
Moreover, according to the present invention, the sensing circuit is able to work stably and reliably over an extremely long period of time with a commercially available small-sized dry cell because of the possible remarkable reduction of power consumption.
A preferred embodiment of the present invention will be described in detail hereinbelow with reference to the accompanying drawings, wherewith a concrete structure and advantages of the invention will be further understood.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a circuit diagram showing an embodiment of a power source voltage stabilizing circuit according to the present invention;
REFERENCES:
patent: 3132309 (1964-05-01), Constable
patent: 3849716 (1974-11-01), De Bergh et al.
patent: 3928793 (1975-12-01), Waltz
Kuroda Toshihiko
Sugiyama Kazuo
Dentan Kabushiki Kaisha
Grimm Siegfried H.
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