JPS61131609A - Oscillating circuit - Google Patents

Abstract

PURPOSE:To change a duty ratio and a frequency of an oscillated output by inserting a phototransistor (TR) to a feedback circuit of a Schmitt inverter gate. CONSTITUTION:When an output of the Schmitt inverter gate 1 is at a high level, a capacitor 2 is charged through a photodetector element 5, a diode 4 and a resistor 3. When the charging voltage of the capacitor 2 reaches a high level threshold value of the gate 1, the output of the gate 1 is inverted to be at a low level and the capacitor 2 is discharged via a resistor 3 only. When the voltage across the capacitor 2 reaches the low level threshold level of the gate 1, the output of the gate 1 is inverted again to a high level. In changing the impedance of the photodetector 5 by a light emitting diode 6, the charging time constant of the capacitor 2 is made variable and then the duty ratio and the oscillating frequency of the oscillated output of the gate 1 are made variable.

Description

DETAILED DESCRIPTION OF THE INVENTION FIELD OF APPLICATION OF THE INVENTION 1 The present invention relates to a fragrance generating circuit using a Schmidt inverter gate.

[Background of the Invention J] Conventionally, as an EB circuit used in a Schmidt inverter gate, there is said to be one described in, for example, "Scenting Circuit", p. 246, Transistor Technology, February 1980, published by Cq Publishing. This conventional oscillation circuit is shown in circuit diagrams 1-5 and 7. 6 and 6 are the input signal waveform and output signal waveform of the Schmidt inverter gate 10 shown in FIGS. 5 and 7, respectively.

In the oscillator circuit shown in Figure 1lfLs, when the output of the Schmitt inverter gate 1 is at the @H level, the 'JP' capacitor 2 is charged through a feedback resistance of 3t. ! rises and Tu
After t (seconds) @H Lebel threshold voltage vti is reached,
Shumiso toy/parter gate 1 output is inverted, @L”
level.

When the output of the simulator gate 1 reaches the 1Lm level, the charge that had been charged in the pacita 2 is discharged through the return resistor 3. Therefore, the input pressure Vl of the input inverter gate 10 decreases, and after TL, (seconds).
When the L level threshold voltage VI& is reached, the output of the Schmitt inverter gate 1 is inverted and becomes -H'' level.

Returning the above operation by <9, the 01 main path outputs a rectangular wave with a period of T1, Tl, +'l', , (seconds).

In the excavation circuit shown in Fig. 7, when the output of the Schmidt inverter gate 1 is at H'' level, the diode 4 becomes conductive due to the applied voltage, and the capacitor 2 is connected to the feedback resistor 3'2. Therefore, Schmidt Imperter Gate 1 f) Input 'vJT pressure + t
VX increases, ? ! +2 L seconds】Later II H1 Rubel Threshold I @Dragon Pressure V! ! +, and the output of the inverter gate 10 is inverted and becomes -L'' level.

Shumi Misaki to inverter gate 1 output is 1L level ff
? Then, a reverse voltage is applied to the s' diode 4, which makes it non-conductive, and the capacitor 2 is charged and discharged through the feedback resistor 6. The input early output Vτ of Cape Shumi Toinopata gate 1 decreases, and T1
After 12 [seconds], when the V level threshold voltage VIE is reached, the output of the Schmidt gate 1 is inverted and becomes the "H" level.

By repeating the above-described operation, the main exit path outputs a rectangular wave of self-control T2''TyI2+Tb2 (seconds).

The duty ratio and oscillation frequency f of the output letter of the oscillation circuit in FIG. 5 are '1'i+/(TII*+Tc+), respectively.
-i++50X(','Ti+Tc+) and f+-
1/(T11++Tb1) HE roars. In addition, W, the duty ratio and firing frequency f of the output signal of the spring circuit in Figure 7
2 is roughly TI2/(Ti2+'l'b2) and f2s
1/('1'w2+T&2]H". All of these values are constant values. In other words, the conventional excavation circuit used for Schudzut inverter gates has a duty ratio and a It has the disadvantage that it is not possible to change the wave number arbitrarily.

OBJECTS OF THE INVENTION It is an object of the present invention to provide an oscillation path using a Schmidt inverter gate in which the Tute ratio and oscillation frequency are variable.

(Summary of the invention) A receiving element whose innovidance changes depending on the receiving quantity is provided in the return channel of the excavation circuit, and the duty ratio of the output of the oscillation circuit is changed by arbitrarily changing the receiving quantity of the receiving element. and make the fragrance frequency variable.

[Embodiments of the invention]

Hereinafter, one embodiment of the present invention will be described with reference to FIG. ig+ to FIG. 4.

+@1 In the excavation circuit shown in Figure 2, a capacitor 2 is connected to the inverter gate 10 of the inverter gate 1, and the input of the anode gate 1 is used as a feedback circuit that positively feeds back the output signal of the inverter gate 1 to the input section. Connect to the part
A diode 4, which is connected in series to the cathode of the diode 4, and connected in parallel to a receiving element 5, a tube, and a feedback resistor 3 is used. The impedance of the receiving element 5 changes depending on the value of the current flowing through the receiving element 6 arranged in pair therewith, that is, depending on the amount of the receiving element.

With this configuration, the excavation circuit shown in FIG. 1 has the output of Shumi Misaki Toy 7 barter gate 1 in the "H" novel setting, and the diode 4 is applied with the same pressure and becomes conductive.
The capacitor 2 is photoelectrically operated by the feedback resistor 52 and the receiving element 5. For this reason, as shown in the second factor, the input voltage Vx of the Schmidt inverter gate 1 increases, Tl3 (seconds)
After reaching the -H' level, the IIL voltage Vti is reached, and the output of the simulated inverter gate 1 is inverted and becomes the 'L' level.

When the output d(@) of the inverter gate 1 reaches the ``'' level, a reverse voltage is applied to the diode 4 and it becomes non-conducting.
The 11L load is released only through the feedback resistor 3, and the input voltage Vl of the Schmidt inverter gate 1 drops to T.
After m3 (seconds), when the L° level threshold voltage VtL is reached, the output of the simulated inverter gate 10 is inverted.
It's an H'' novel.

By returning the operation 't<r) described above, the main path outputs a rectangular wave with a period T, = a'l'H3+TL3C seconds). Since the innovidance changes accordingly, there are 2 in this circuit and the received ft,
Flow rate: When changed, the charging time of capacitor 2 is increased by 5.
It will be possible to change the ligature.

Therefore, the photoelectric time Ttxs k of the capacitor 2 is set to about 0 to TI, by creating a strong current I flowing through the power generating element 6.
It can be changed within a range of 3 (seconds).

Therefore, the duty ratio is about 0 to 50 (X), and the oscillation frequency is '/Tbs~'/2Tt, any 1! within the range of 5 (Hz). VC is variable.

FIG. 3 is a circuit diagram of an oscillation circuit according to another embodiment of the present invention. As the *return route to the departure BID route in Figure 3,
A diode 7 connected to the output part of the anode ligation gate 1 and a light receiving element 8 connected in series to the cathode of the diode 7 are connected in parallel to one feedback resistor 3. The amount of light received by the light receiving element 7 is changed by changing the subject fiIk that is applied to the detection element 9.

The oscillation circuit of FIG. 1 changes the charging time Tyza of the capacitor 2, whereas the oscillation @J@ of FIG. 3 changes the charging time Tyza of the capacitor 2. This is to convert iE@ to Thkf. In the oscillation circuit shown in Figure 3, the duty ratio is approximately 50 to 100 (%).
, the oscillation frequency can be varied to any value within the range of kl/Tma to 1/2Tma (Hz).

FIG. 4 shows one of the departure routes according to yet another embodiment of the present invention.
It's a road trip. As a return path in the excavation circuit of FIG.
a diode 40 connected in series to the cathode of the photodetector 5; a diode 7 connected to the output of the anode gate 1; and a diode 7 connected to the cathode of the diode 7.
To 1! A pair of light receiving elements 8 connected in parallel is used. The amount of light received by each light-receiving element 5.8 is sent to detection elements 6 and 9 facing each other.
It is supposed to be changed by the current 11+I2.

With such a configuration, in the oscillation circuit shown in FIG. 4, when the output of the shutter inverter gate 1 is at the @H# level, the diode 4 becomes conductive due to the application of high pressure, and the diode 7 becomes conductive. A reverse voltage is applied, resulting in a non-conducting state. At this time, the capacitor 2 is photoelectronized by activating the light receiving element 5, so that the input voltage vX of the Shumi Misaki toy 7 and the gate 1 rises, and after 7W5 (seconds), the threshold voltage V is at the -8'' level. Engineering.

The output of the simulation inverter gate 1 is inverted and becomes the "L" level.

When the output of the inverter gate 1 becomes @L'' level, the diode 4 becomes non-conductive due to the reverse pressure applied to it, and the diode 7 has a forward pressure of t=i17F.
When the temperature decreases, it becomes conductive. As a result, the load charged in the capacitor 2 is discharged through the light-receiving element 8r, and the input voltage of the gate 1 decreases and Tc
After 5 (seconds) 'L'', the threshold voltage is different from VI, and the output of -taggate 10 is inverted and -H''.
level.

By repeating the above-mentioned operation, this circuit outputs a rectangular wave with period T5=Ti5+Tt and 5 (seconds).
This circuit can be changed arbitrarily by changing the charging time T115D of the capacitor 2, the discharge time Tr, 5'<the current 112 flowing through the generator element 6, and the current 2 flowing through the detector element 8. To do this, the duty ratio is 2L, so 0 to 10.
%), the oscillation frequency can be varied over a wide range of several thousand.

K~TM5+TX, sHz Furthermore, since the light-receiving element and the detection element of the present invention are electrically insulated, the current Ik iv+ flowing through the emitting frS element is
There is no need to take into account any problems on the side of the emission port, and the circuit can be simplified.

〔Effect of the invention〕

According to the present invention, there is an effect that the tutee ratio of the output signal of the oscillation circuit can be arbitrarily varied to 2L and the oscillation frequency with a simple circuit configuration.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram of the source It1 circuit according to one embodiment of the present invention, FIG. 2 is a diagram of input and output voltage waveforms of the source ab path of FIG. 1, and FIG. 3 is a diagram of another embodiment of the present invention. FIG. 4 is a circuit diagram of a starting circuit according to still another embodiment of the present invention. Fig. 5 is a line diagram of a conventional oscillation circuit, Fig. 6 is a waveform diagram of the human output pressure waveform of the fifth oscillation route, Fig. 7 is a circuit diagram of another conventional excavation circuit, and Fig. 8 is a circuit diagram of another conventional excavation circuit. The input/output voltage waveform diagram of the oscillation circuit in FIG. 7 is shown. 1... Shi, Misaki inverter, 2...:P Yabashita, 3... Life return resistor, 4.7... Diode, 5.8
... Light receiving element, 6.9... Detection element. 1. -''nee==p...

Claims (1)

[Claims] 1. In an oscillation circuit comprising a Schmitt inverter gate with a capacitor connected to the input part and a feedback circuit that positively feeds back the output signal of the Schmitt inverter gate to the input part, the impedance changes depending on the amount of light received. An oscillation circuit characterized in that an element is provided in the feedback circuit, and the amount of light received by the light receiving element is changed to make the duty ratio and oscillation frequency of the output signal of the oscillation circuit variable.