Electrical transmission or interconnection systems – Personnel safety or limit control features – Interlock
Patent
1986-08-12
1988-02-09
Zazworsky, John
Electrical transmission or interconnection systems
Personnel safety or limit control features
Interlock
307296R, 307355, 330 51, 330252, H03K 5153, H03K 524
Patent
active
047243392
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a low electric power consumption voltage comparison circuit utilized in an electronic circuit for a pulse encoder or the like.
BACKGROUND ART
A conventional voltage comparison device using a differential amplification circuit is shown in FIG. 1, FIG. 2, and FIG. 3. In FIG. 1, an operational amplifier 50 as a voltage comparison device is shown. The operational amplifier 50 is supplied with an electric power from a +V electric power source 21 through an electric power supply feeder 51, and the electric power returns to a negative terminal 22 (usually ground potential) of the power source through an electric power return feeder 52. Also, an input signal S(IN) is supplied to a noninverting input terminal 53 and an inverting input terminal 54, and the output is obtained at an output terminal 55. Such a voltage comparison device as an operational amplifier which is usually part of an integrated circuit has a problem in that the device has a comparatively large electric power consumption since it includes the differential amplification circuit. Particularly, when the electric power is supplied with a cell or the like to the above circuit, the effect is remarkable. For this reason, as shown in FIG. 2, a circuit is known wherein the electric power is supplied as a pulse S (PULSE) only when the voltage comparison is performed. In this example, an input signal 15 as an input is applied between the noninverting input terminal 53 and the inverting input terminal 54, and a bias voltage V (BIAS) from a bias source 26 is applied to the inverting input terminal 54. The circuit diagram of the portion of the differential amplification circuit in this circuit is shown in FIG. 3. In an example of this circuit, the differential amplification circuit is constituted with two transistors 56 and 57 connected to each other at their emitters, resistors 62 and 63 connected to the collectors of the transistors 56 and 57, respectively, and a resistor 61 connected to the emitters of the transistors 56 and 57. A switch 60 inserted in the electric power supply feed circuit turns the voltage of the electric power source 21 ON or OFF, the voltage comparison circuit operates intermittently, and the output is obtained at a terminal 65. If the circuits as shown in FIG. 2 and FIG. 3 are used, the electric power consumption can be suppressed to a low value.
In the circuits of FIG. 2 and FIG. 3, however, when the switch is made to turn OFF the supply of electric power intermittently, almost all of the circuits are reduced to the potential of the return side of the electric power source, that is, usually ground potential. In the next step when the switch turns ON to operate the voltage comparison, a high speed rise to a required potential cannot be performed as a certain time lag is necessary, and thus a high speed intermittent operation is difficult.
DISCLOSURE OF THE INVENTION
An object of the present invention is to obtain a voltage comparison device by which it is possible to consume a low electric power and to operate intermittently at a high speed, based on an idea wherein the voltage comparison device comprises electric current switch circuits at the electric power supply side and at the electric power return side for a differential amplification means therein and the switch circuits turn ON and OFF intermittently.
In the present invention, there is provided a voltage comparison device which comprises a differential amplification means having a noninverting input terminal and an inverting input terminal, for differentially amplifying an input signal and for generating an output signal; a first and a second voltage source; an electric power supply feeder for connecting between the differential amplification means and the first voltage source; an electric power return feeder for connecting between the differential amplification means and the second voltage source; a first electric current supply circuit (electric current switch) having a switching element and inserted in the middle of the
REFERENCES:
patent: 4004158 (1977-01-01), Morgan
patent: 4309627 (1982-01-01), Tabata
patent: 4461964 (1984-07-01), Shiotari
Fanuc Ltd.
Zazworsky John
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